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core: fix pthreads performance
OpenCV pthreads-based implementation changes: - rework worker threads pool, allow to execute job by the main thread too - rework synchronization scheme (wait for job completion, threads 'pong' answer is not required) - allow "active wait" (spin) by worker threads and by the main thread - use _mm_pause() during active wait (support for Hyper-Threading technology) - use sched_yield() to avoid preemption of still working other workers - don't use getTickCount() - optional builtin thread pool profiler (disabled by compilation flag)
This commit is contained in:
Alexander Alekhin
Alexander Alekhin
parent
47998c03f8
commit
c49d5d5252
@ -233,6 +233,8 @@ CV_EXPORTS_W int getNumThreads();
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/** @brief Returns the index of the currently executed thread within the current parallel region. Always
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/** @brief Returns the index of the currently executed thread within the current parallel region. Always
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returns 0 if called outside of parallel region.
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returns 0 if called outside of parallel region.
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@deprecated Current implementation doesn't corresponding to this documentation.
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The exact meaning of the return value depends on the threading framework used by OpenCV library:
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The exact meaning of the return value depends on the threading framework used by OpenCV library:
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- `TBB` - Unsupported with current 4.1 TBB release. Maybe will be supported in future.
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- `TBB` - Unsupported with current 4.1 TBB release. Maybe will be supported in future.
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- `OpenMP` - The thread number, within the current team, of the calling thread.
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- `OpenMP` - The thread number, within the current team, of the calling thread.
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@ -42,6 +42,7 @@
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#include "precomp.hpp"
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#include "precomp.hpp"
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#include <opencv2/core/utils/configuration.private.hpp>
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#include <opencv2/core/utils/trace.private.hpp>
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#include <opencv2/core/utils/trace.private.hpp>
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#if defined _WIN32 || defined WINCE
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#if defined _WIN32 || defined WINCE
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@ -125,19 +126,15 @@
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# define CV_PARALLEL_FRAMEWORK "pthreads"
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# define CV_PARALLEL_FRAMEWORK "pthreads"
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#endif
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#endif
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#include "parallel_impl.hpp"
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using namespace cv;
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using namespace cv;
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namespace cv
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namespace cv
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{
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{
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ParallelLoopBody::~ParallelLoopBody() {}
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ParallelLoopBody::~ParallelLoopBody() {}
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#ifdef HAVE_PTHREADS_PF
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void parallel_for_pthreads(const cv::Range& range, const cv::ParallelLoopBody& body, double nstripes);
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size_t parallel_pthreads_get_threads_num();
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void parallel_pthreads_set_threads_num(int num);
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#endif
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}
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}
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namespace
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namespace
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{
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{
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#ifdef CV_PARALLEL_FRAMEWORK
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#ifdef CV_PARALLEL_FRAMEWORK
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@ -536,10 +533,35 @@ int cv::getNumThreads(void)
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#endif
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#endif
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}
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}
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void cv::setNumThreads( int threads )
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namespace cv {
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unsigned defaultNumberOfThreads()
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{
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{
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(void)threads;
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#ifdef __ANDROID__
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// many modern phones/tables have 4-core CPUs. Let's use no more
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// than 2 threads by default not to overheat the devices
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const unsigned int default_number_of_threads = 2;
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#else
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const unsigned int default_number_of_threads = (unsigned int)std::max(1, cv::getNumberOfCPUs());
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#endif
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unsigned result = default_number_of_threads;
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static int config_num_threads = (int)utils::getConfigurationParameterSizeT("OPENCV_FOR_THREADS_NUM", 0);
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if (config_num_threads)
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{
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result = (unsigned)std::max(1, config_num_threads);
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//do we need upper limit of threads number?
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}
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return result;
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}
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}
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void cv::setNumThreads( int threads_ )
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{
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(void)threads_;
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#ifdef CV_PARALLEL_FRAMEWORK
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#ifdef CV_PARALLEL_FRAMEWORK
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int threads = (threads_ < 0) ? defaultNumberOfThreads() : (unsigned)threads_;
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numThreads = threads;
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numThreads = threads;
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#endif
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#endif
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765
modules/core/src/parallel_impl.cpp
Normal file
765
modules/core/src/parallel_impl.cpp
Normal file
@ -0,0 +1,765 @@
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// This file is part of OpenCV project.
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// It is subject to the license terms in the LICENSE file found in the top-level directory
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// of this distribution and at http://opencv.org/license.html.
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#include "precomp.hpp"
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#include "parallel_impl.hpp"
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#ifdef HAVE_PTHREADS_PF
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#include <pthread.h>
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#include <opencv2/core/utils/configuration.private.hpp>
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#include <opencv2/core/utils/logger.defines.hpp>
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//#undef CV_LOG_STRIP_LEVEL
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//#define CV_LOG_STRIP_LEVEL CV_LOG_LEVEL_VERBOSE + 1
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#include <opencv2/core/utils/logger.hpp>
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//#define CV_PROFILE_THREADS 64
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//#define getTickCount getCPUTickCount // use this if getTickCount() calls are expensive (and getCPUTickCount() is accurate)
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//#define CV_USE_GLOBAL_WORKERS_COND_VAR // not effective on many-core systems (10+)
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#ifdef CV_CXX11
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#include <atomic>
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#else
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#include <unistd.h> // _POSIX_PRIORITY_SCHEDULING
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#endif
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// Spin lock's OS-level yield
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#ifdef DECLARE_CV_YIELD
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DECLARE_CV_YIELD
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#endif
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#ifndef CV_YIELD
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# ifdef CV_CXX11
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# include <thread>
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# define CV_YIELD() std::this_thread::yield()
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# elif defined(_POSIX_PRIORITY_SCHEDULING)
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# include <sched.h>
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# define CV_YIELD() sched_yield()
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# else
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# warning "Can't detect sched_yield() on the target platform. Specify CV_YIELD() definition via compiler flags."
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# define CV_YIELD() /* no-op: works, but not effective */
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# endif
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#endif // CV_YIELD
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// Spin lock's CPU-level yield (required for Hyper-Threading)
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#ifdef DECLARE_CV_PAUSE
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DECLARE_CV_PAUSE
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#endif
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#ifndef CV_PAUSE
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#if defined __GNUC__ && (defined __i386__ || defined __x86_64__)
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# define CV_PAUSE(v) do { for (int __delay = (v); __delay > 0; --__delay) { _mm_pause(); } } while (0)
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# elif defined __GNUC__ && defined __aarch64__
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# define CV_PAUSE(v) do { for (int __delay = (v); __delay > 0; --__delay) { asm volatile("yield" ::: "memory"); } } while (0)
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# elif defined __GNUC__ && defined __arm__
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# define CV_PAUSE(v) do { for (int __delay = (v); __delay > 0; --__delay) { asm volatile("" ::: "memory"); } } while (0)
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# else
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# warning "Can't detect 'pause' (CPU-yield) instruction on the target platform. Specify CV_PAUSE() definition via compiler flags."
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# define CV_PAUSE(...) do { /* no-op: works, but not effective */ } while (0)
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# endif
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#endif // CV_PAUSE
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namespace cv
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{
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static int CV_ACTIVE_WAIT_PAUSE_LIMIT = (int)utils::getConfigurationParameterSizeT("OPENCV_THREAD_POOL_ACTIVE_WAIT_PAUSE_LIMIT", 16); // iterations
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static int CV_WORKER_ACTIVE_WAIT = (int)utils::getConfigurationParameterSizeT("OPENCV_THREAD_POOL_ACTIVE_WAIT_WORKER", 2000); // iterations
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static int CV_MAIN_THREAD_ACTIVE_WAIT = (int)utils::getConfigurationParameterSizeT("OPENCV_THREAD_POOL_ACTIVE_WAIT_MAIN", 10000); // iterations
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static int CV_WORKER_ACTIVE_WAIT_THREADS_LIMIT = (int)utils::getConfigurationParameterSizeT("OPENCV_THREAD_POOL_ACTIVE_WAIT_THREADS_LIMIT", 0); // number of real cores
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class WorkerThread;
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class ParallelJob;
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class ThreadPool
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{
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public:
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static ThreadPool& instance()
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{
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CV_SINGLETON_LAZY_INIT_REF(ThreadPool, new ThreadPool())
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}
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static void stop()
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{
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ThreadPool& manager = instance();
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manager.reconfigure(0);
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}
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void reconfigure(unsigned new_threads_count)
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{
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if (new_threads_count == threads.size())
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return;
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pthread_mutex_lock(&mutex);
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reconfigure_(new_threads_count);
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pthread_mutex_unlock(&mutex);
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}
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bool reconfigure_(unsigned new_threads_count); // internal implementation
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void run(const Range& range, const ParallelLoopBody& body, double nstripes);
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size_t getNumOfThreads();
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void setNumOfThreads(unsigned n);
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ThreadPool();
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~ThreadPool();
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unsigned num_threads;
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pthread_mutex_t mutex; // guards fields (job/threads) from non-worker threads (concurrent parallel_for calls)
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#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
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pthread_cond_t cond_thread_wake;
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#endif
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pthread_mutex_t mutex_notify;
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pthread_cond_t cond_thread_task_complete;
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std::vector< Ptr<WorkerThread> > threads;
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Ptr<ParallelJob> job;
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#ifdef CV_PROFILE_THREADS
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double tickFreq;
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int64 jobSubmitTime;
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struct ThreadStatistics
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{
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ThreadStatistics() : threadWait(0)
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{
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reset();
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}
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void reset()
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{
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threadWake = 0;
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threadExecuteStart = 0;
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threadExecuteStop = 0;
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executedTasks = 0;
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keepActive = false;
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threadPing = getTickCount();
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}
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int64 threadWait; // don't reset by default
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int64 threadPing; // don't reset by default
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int64 threadWake;
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int64 threadExecuteStart;
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int64 threadExecuteStop;
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int64 threadFree;
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unsigned executedTasks;
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bool keepActive;
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int64 dummy_[8]; // separate cache lines
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void dump(int id, int64 baseTime, double tickFreq)
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{
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if (id < 0)
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std::cout << "Main: ";
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else
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printf("T%03d: ", id + 2);
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printf("wait=% 10.1f ping=% 6.1f",
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threadWait > 0 ? (threadWait - baseTime) / tickFreq * 1e6 : -0.0,
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threadPing > 0 ? (threadPing - baseTime) / tickFreq * 1e6 : -0.0);
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if (threadWake > 0)
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printf(" wake=% 6.1f",
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(threadWake > 0 ? (threadWake - baseTime) / tickFreq * 1e6 : -0.0));
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if (threadExecuteStart > 0)
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{
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printf(" exec=% 6.1f - % 6.1f tasksDone=%5u free=% 6.1f",
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(threadExecuteStart > 0 ? (threadExecuteStart - baseTime) / tickFreq * 1e6 : -0.0),
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(threadExecuteStop > 0 ? (threadExecuteStop - baseTime) / tickFreq * 1e6 : -0.0),
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executedTasks,
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(threadFree > 0 ? (threadFree - baseTime) / tickFreq * 1e6 : -0.0));
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if (id >= 0)
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printf(" active=%s\n", keepActive ? "true" : "false");
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else
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printf("\n");
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}
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else
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printf(" ------------------------------------------------------------------------------\n");
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}
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};
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ThreadStatistics threads_stat[CV_PROFILE_THREADS]; // 0 - main thread, 1..N - worker threads
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#endif
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};
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class WorkerThread
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{
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public:
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ThreadPool& thread_pool;
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unsigned id;
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pthread_t posix_thread;
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bool is_created;
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volatile bool stop_thread;
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volatile bool has_wake_signal;
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volatile bool dont_wait;
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Ptr<ParallelJob> job;
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pthread_mutex_t mutex;
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#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
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volatile bool isActive;
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pthread_cond_t cond_thread_wake;
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#endif
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WorkerThread(ThreadPool& thread_pool_, unsigned id_) :
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thread_pool(thread_pool_),
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id(id_),
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posix_thread(0),
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is_created(false),
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stop_thread(false),
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has_wake_signal(false),
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dont_wait(false)
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#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
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, isActive(true)
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#endif
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{
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CV_LOG_VERBOSE(NULL, 1, "MainThread: initializing new worker: " << id);
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int res = pthread_mutex_init(&mutex, NULL);
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if (res != 0)
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{
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CV_LOG_ERROR(NULL, id << ": Can't create thread mutex: res = " << res);
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return;
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}
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#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
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res = pthread_cond_init(&cond_thread_wake, NULL);
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if (res != 0)
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{
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CV_LOG_ERROR(NULL, id << ": Can't create thread condition variable: res = " << res);
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return;
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}
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#endif
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res = pthread_create(&posix_thread, NULL, thread_loop_wrapper, (void*)this);
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if (res != 0)
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{
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CV_LOG_ERROR(NULL, id << ": Can't spawn new thread: res = " << res);
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}
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else
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{
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is_created = true;
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}
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}
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~WorkerThread()
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{
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CV_LOG_VERBOSE(NULL, 1, "MainThread: destroy worker thread: " << id);
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if (is_created)
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{
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if (!stop_thread)
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{
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pthread_mutex_lock(&mutex); // to avoid signal miss due pre-check
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stop_thread = true;
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pthread_mutex_unlock(&mutex);
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#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
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pthread_cond_broadcast(&thread_pool.cond_thread_wake);
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#else
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pthread_cond_signal(&cond_thread_wake);
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#endif
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}
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pthread_join(posix_thread, NULL);
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}
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#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
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pthread_cond_destroy(&cond_thread_wake);
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#endif
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pthread_mutex_destroy(&mutex);
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}
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void thread_body();
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static void* thread_loop_wrapper(void* thread_object)
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{
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((WorkerThread*)thread_object)->thread_body();
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return 0;
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}
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};
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class ParallelJob
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{
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public:
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ParallelJob(const ThreadPool& thread_pool_, const Range& range_, const ParallelLoopBody& body_, int nstripes_) :
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thread_pool(thread_pool_),
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body(body_),
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range(range_),
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nstripes((unsigned)nstripes_),
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is_completed(false)
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{
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|
CV_LOG_VERBOSE(NULL, 5, "ParallelJob::ParallelJob(" << (void*)this << ")");
|
||||||
|
#ifdef CV_CXX11
|
||||||
|
current_task.store(0, std::memory_order_relaxed);
|
||||||
|
active_thread_count.store(0, std::memory_order_relaxed);
|
||||||
|
completed_thread_count.store(0, std::memory_order_relaxed);
|
||||||
|
#else
|
||||||
|
current_task = 0;
|
||||||
|
active_thread_count = 0;
|
||||||
|
completed_thread_count = 0;
|
||||||
|
#endif
|
||||||
|
dummy0_[0] = 0, dummy1_[0] = 0, dummy2_[0] = 0; // compiler warning
|
||||||
|
}
|
||||||
|
|
||||||
|
~ParallelJob()
|
||||||
|
{
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "ParallelJob::~ParallelJob(" << (void*)this << ")");
|
||||||
|
}
|
||||||
|
|
||||||
|
unsigned execute(bool is_worker_thread)
|
||||||
|
{
|
||||||
|
unsigned executed_tasks = 0;
|
||||||
|
const int task_count = range.size();
|
||||||
|
const int remaining_multiplier = std::min(nstripes,
|
||||||
|
std::max(
|
||||||
|
std::min(100u, thread_pool.num_threads * 4),
|
||||||
|
thread_pool.num_threads * 2
|
||||||
|
)); // experimental value
|
||||||
|
for (;;)
|
||||||
|
{
|
||||||
|
int chunk_size = std::max(1, (task_count - current_task) / remaining_multiplier);
|
||||||
|
#ifdef CV_CXX11
|
||||||
|
int id = current_task.fetch_add(chunk_size, std::memory_order_seq_cst);
|
||||||
|
#else
|
||||||
|
int id = (int)CV_XADD(¤t_task, chunk_size);
|
||||||
|
#endif
|
||||||
|
if (id >= task_count)
|
||||||
|
break; // no more free tasks
|
||||||
|
|
||||||
|
executed_tasks += chunk_size;
|
||||||
|
int start_id = id;
|
||||||
|
int end_id = std::min(task_count, id + chunk_size);
|
||||||
|
CV_LOG_VERBOSE(NULL, 9, "Thread: job " << start_id << "-" << end_id);
|
||||||
|
|
||||||
|
//TODO: if (not pending exception)
|
||||||
|
{
|
||||||
|
body.operator()(Range(range.start + start_id, range.start + end_id));
|
||||||
|
}
|
||||||
|
if (is_worker_thread && is_completed)
|
||||||
|
{
|
||||||
|
CV_LOG_ERROR(NULL, "\t\t\t\tBUG! Job: " << (void*)this << " " << id << " " << active_thread_count << " " << completed_thread_count);
|
||||||
|
CV_Assert(!is_completed); // TODO Dbg this
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return executed_tasks;
|
||||||
|
}
|
||||||
|
|
||||||
|
const ThreadPool& thread_pool;
|
||||||
|
const ParallelLoopBody& body;
|
||||||
|
const Range range;
|
||||||
|
const unsigned nstripes;
|
||||||
|
#ifdef CV_CXX11
|
||||||
|
std::atomic<int> current_task; // next free part of job
|
||||||
|
int64 dummy0_[8]; // avoid cache-line reusing for the same atomics
|
||||||
|
|
||||||
|
std::atomic<int> active_thread_count; // number of threads worked on this job
|
||||||
|
int64 dummy1_[8]; // avoid cache-line reusing for the same atomics
|
||||||
|
|
||||||
|
std::atomic<int> completed_thread_count; // number of threads completed any activities on this job
|
||||||
|
int64 dummy2_[8]; // avoid cache-line reusing for the same atomics
|
||||||
|
#else
|
||||||
|
/*CV_DECL_ALIGNED(64)*/ volatile int current_task; // next free part of job
|
||||||
|
int64 dummy0_[8]; // avoid cache-line reusing for the same atomics
|
||||||
|
|
||||||
|
/*CV_DECL_ALIGNED(64)*/ volatile int active_thread_count; // number of threads worked on this job
|
||||||
|
int64 dummy1_[8]; // avoid cache-line reusing for the same atomics
|
||||||
|
|
||||||
|
/*CV_DECL_ALIGNED(64)*/ volatile int completed_thread_count; // number of threads completed any activities on this job
|
||||||
|
int64 dummy2_[8]; // avoid cache-line reusing for the same atomics
|
||||||
|
#endif
|
||||||
|
|
||||||
|
volatile bool is_completed; // std::atomic_flag ?
|
||||||
|
|
||||||
|
// TODO exception handling
|
||||||
|
};
|
||||||
|
|
||||||
|
|
||||||
|
void WorkerThread::thread_body()
|
||||||
|
{
|
||||||
|
(void)cv::utils::getThreadID(); // notify OpenCV about new thread
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "Thread: new thread: " << id);
|
||||||
|
|
||||||
|
bool allow_active_wait = true;
|
||||||
|
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
ThreadPool::ThreadStatistics& stat = thread_pool.threads_stat[id + 1];
|
||||||
|
#endif
|
||||||
|
|
||||||
|
while (!stop_thread)
|
||||||
|
{
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "Thread: ... loop iteration: allow_active_wait=" << allow_active_wait << " has_wake_signal=" << has_wake_signal << " dont_wait=" << dont_wait );
|
||||||
|
if (allow_active_wait && CV_WORKER_ACTIVE_WAIT > 0)
|
||||||
|
{
|
||||||
|
allow_active_wait = false;
|
||||||
|
for (int i = 0; i < CV_WORKER_ACTIVE_WAIT; i++)
|
||||||
|
{
|
||||||
|
if (has_wake_signal)
|
||||||
|
break;
|
||||||
|
if (CV_ACTIVE_WAIT_PAUSE_LIMIT > 0 && (i < CV_ACTIVE_WAIT_PAUSE_LIMIT || (i & 1)))
|
||||||
|
CV_PAUSE(16);
|
||||||
|
else
|
||||||
|
CV_YIELD();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
pthread_mutex_lock(&mutex);
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
stat.threadWait = getTickCount();
|
||||||
|
#endif
|
||||||
|
while (!has_wake_signal && !dont_wait) // to handle spurious wakeups
|
||||||
|
{
|
||||||
|
//CV_LOG_VERBOSE(NULL, 5, "Thread: wait (sleep) ...");
|
||||||
|
#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
|
||||||
|
pthread_cond_wait(&thread_pool.cond_thread_wake, &mutex);
|
||||||
|
#else
|
||||||
|
isActive = false;
|
||||||
|
pthread_cond_wait(&cond_thread_wake, &mutex);
|
||||||
|
isActive = true;
|
||||||
|
#endif
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "Thread: wake ... (has_wake_signal=" << has_wake_signal << " stop_thread=" << stop_thread << ")")
|
||||||
|
}
|
||||||
|
dont_wait = false;
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
stat.threadWake = getTickCount();
|
||||||
|
#endif
|
||||||
|
|
||||||
|
if (!stop_thread)
|
||||||
|
{
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "Thread: checking for new job");
|
||||||
|
if (CV_WORKER_ACTIVE_WAIT_THREADS_LIMIT == 0)
|
||||||
|
allow_active_wait = true;
|
||||||
|
Ptr<ParallelJob> j_ptr; swap(j_ptr, job);
|
||||||
|
has_wake_signal = false;
|
||||||
|
pthread_mutex_unlock(&mutex);
|
||||||
|
ParallelJob* j = j_ptr;
|
||||||
|
if (j)
|
||||||
|
{
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "Thread: job size=" << j->range.size() << " done=" << j->current_task);
|
||||||
|
if (j->current_task < j->range.size())
|
||||||
|
{
|
||||||
|
#ifdef CV_CXX11
|
||||||
|
int other = j->active_thread_count.fetch_add(1, std::memory_order_seq_cst);
|
||||||
|
#else
|
||||||
|
int other = CV_XADD(&j->active_thread_count, 1);
|
||||||
|
#endif
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "Thread: processing new job (with " << other << " other threads)"); CV_UNUSED(other);
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
stat.threadExecuteStart = getTickCount();
|
||||||
|
stat.executedTasks = j->execute(true);
|
||||||
|
stat.threadExecuteStop = getTickCount();
|
||||||
|
#else
|
||||||
|
j->execute(true);
|
||||||
|
#endif
|
||||||
|
#ifdef CV_CXX11
|
||||||
|
int completed = j->completed_thread_count.fetch_add(1, std::memory_order_seq_cst) + 1;
|
||||||
|
int active = j->active_thread_count.load(std::memory_order_acquire);
|
||||||
|
#else
|
||||||
|
int completed = (int)CV_XADD(&j->completed_thread_count, 1) + 1;
|
||||||
|
int active = j->active_thread_count;
|
||||||
|
#endif
|
||||||
|
if (CV_WORKER_ACTIVE_WAIT_THREADS_LIMIT > 0)
|
||||||
|
{
|
||||||
|
allow_active_wait = true;
|
||||||
|
if (active >= CV_WORKER_ACTIVE_WAIT_THREADS_LIMIT && (id & 1) == 0) // turn off a half of threads
|
||||||
|
allow_active_wait = false;
|
||||||
|
}
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "Thread: completed job processing: " << active << " " << completed);
|
||||||
|
if (active == completed)
|
||||||
|
{
|
||||||
|
bool need_signal = !j->is_completed;
|
||||||
|
j->is_completed = true;
|
||||||
|
j = NULL; j_ptr.release();
|
||||||
|
if (need_signal)
|
||||||
|
{
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "Thread: job finished => notifying the main thread");
|
||||||
|
pthread_mutex_lock(&thread_pool.mutex_notify); // to avoid signal miss due pre-check condition
|
||||||
|
// empty
|
||||||
|
pthread_mutex_unlock(&thread_pool.mutex_notify);
|
||||||
|
pthread_cond_broadcast/*pthread_cond_signal*/(&thread_pool.cond_thread_task_complete);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
has_wake_signal = false;
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "Thread: no free job tasks");
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
pthread_mutex_unlock(&mutex);
|
||||||
|
}
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
stat.threadFree = getTickCount();
|
||||||
|
stat.keepActive = allow_active_wait;
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
ThreadPool::ThreadPool()
|
||||||
|
{
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
tickFreq = getTickFrequency();
|
||||||
|
#endif
|
||||||
|
|
||||||
|
int res = 0;
|
||||||
|
res |= pthread_mutex_init(&mutex, NULL);
|
||||||
|
res |= pthread_mutex_init(&mutex_notify, NULL);
|
||||||
|
#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
|
||||||
|
res |= pthread_cond_init(&cond_thread_wake, NULL);
|
||||||
|
#endif
|
||||||
|
res |= pthread_cond_init(&cond_thread_task_complete, NULL);
|
||||||
|
|
||||||
|
if (0 != res)
|
||||||
|
{
|
||||||
|
CV_LOG_FATAL(NULL, "Failed to initialize ThreadPool (pthreads)");
|
||||||
|
}
|
||||||
|
num_threads = defaultNumberOfThreads();
|
||||||
|
}
|
||||||
|
|
||||||
|
bool ThreadPool::reconfigure_(unsigned new_threads_count)
|
||||||
|
{
|
||||||
|
if (new_threads_count == threads.size())
|
||||||
|
return false;
|
||||||
|
|
||||||
|
if (new_threads_count < threads.size())
|
||||||
|
{
|
||||||
|
CV_LOG_VERBOSE(NULL, 1, "MainThread: reduce worker pool: " << threads.size() << " => " << new_threads_count);
|
||||||
|
std::vector< Ptr<WorkerThread> > release_threads(threads.size() - new_threads_count);
|
||||||
|
for (size_t i = new_threads_count; i < threads.size(); ++i)
|
||||||
|
{
|
||||||
|
pthread_mutex_lock(&threads[i]->mutex); // to avoid signal miss due pre-check
|
||||||
|
threads[i]->stop_thread = true;
|
||||||
|
threads[i]->has_wake_signal = true;
|
||||||
|
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
|
||||||
|
pthread_mutex_unlock(&threads[i]->mutex);
|
||||||
|
pthread_cond_broadcast/*pthread_cond_signal*/(&threads[i]->cond_thread_wake); // wake thread
|
||||||
|
#else
|
||||||
|
pthread_mutex_unlock(&threads[i]->mutex);
|
||||||
|
#endif
|
||||||
|
std::swap(threads[i], release_threads[i - new_threads_count]);
|
||||||
|
}
|
||||||
|
#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
|
||||||
|
CV_LOG_VERBOSE(NULL, 1, "MainThread: notify worker threads about termination...");
|
||||||
|
pthread_cond_broadcast(&cond_thread_wake); // wake all threads
|
||||||
|
#endif
|
||||||
|
threads.resize(new_threads_count);
|
||||||
|
release_threads.clear(); // calls thread_join which want to lock mutex
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
CV_LOG_VERBOSE(NULL, 1, "MainThread: upgrade worker pool: " << threads.size() << " => " << new_threads_count);
|
||||||
|
for (size_t i = threads.size(); i < new_threads_count; ++i)
|
||||||
|
{
|
||||||
|
threads.push_back(Ptr<WorkerThread>(new WorkerThread(*this, (unsigned)i))); // spawn more threads
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
ThreadPool::~ThreadPool()
|
||||||
|
{
|
||||||
|
reconfigure(0);
|
||||||
|
pthread_cond_destroy(&cond_thread_task_complete);
|
||||||
|
#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
|
||||||
|
pthread_cond_destroy(&cond_thread_wake);
|
||||||
|
#endif
|
||||||
|
pthread_mutex_destroy(&mutex);
|
||||||
|
pthread_mutex_destroy(&mutex_notify);
|
||||||
|
}
|
||||||
|
|
||||||
|
void ThreadPool::run(const Range& range, const ParallelLoopBody& body, double nstripes)
|
||||||
|
{
|
||||||
|
CV_LOG_VERBOSE(NULL, 1, "MainThread: new parallel job: num_threads=" << num_threads << " range=" << range.size() << " nstripes=" << nstripes << " job=" << (void*)job);
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
jobSubmitTime = getTickCount();
|
||||||
|
threads_stat[0].reset();
|
||||||
|
threads_stat[0].threadWait = jobSubmitTime;
|
||||||
|
threads_stat[0].threadWake = jobSubmitTime;
|
||||||
|
#endif
|
||||||
|
if (getNumOfThreads() > 1 &&
|
||||||
|
job == NULL &&
|
||||||
|
(range.size() * nstripes >= 2 || (range.size() > 1 && nstripes <= 0))
|
||||||
|
)
|
||||||
|
{
|
||||||
|
pthread_mutex_lock(&mutex);
|
||||||
|
if (job != NULL)
|
||||||
|
{
|
||||||
|
pthread_mutex_unlock(&mutex);
|
||||||
|
body(range);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
reconfigure_(num_threads - 1);
|
||||||
|
|
||||||
|
{
|
||||||
|
CV_LOG_VERBOSE(NULL, 1, "MainThread: initialize parallel job: " << range.size());
|
||||||
|
job = Ptr<ParallelJob>(new ParallelJob(*this, range, body, nstripes));
|
||||||
|
pthread_mutex_unlock(&mutex);
|
||||||
|
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "MainThread: wake worker threads...");
|
||||||
|
for (size_t i = 0; i < threads.size(); ++i)
|
||||||
|
{
|
||||||
|
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
|
||||||
|
bool isActive = threads[i]->isActive;
|
||||||
|
if (isActive || threads[i]->has_wake_signal)
|
||||||
|
#else
|
||||||
|
if (threads[i]->has_wake_signal)
|
||||||
|
#endif
|
||||||
|
{
|
||||||
|
pthread_mutex_lock(&threads[i]->mutex);
|
||||||
|
threads[i]->job = job;
|
||||||
|
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
|
||||||
|
isActive = threads[i]->isActive;
|
||||||
|
#endif
|
||||||
|
threads[i]->dont_wait = true;
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
threads_stat[i + 1].reset();
|
||||||
|
#endif
|
||||||
|
pthread_mutex_unlock(&threads[i]->mutex);
|
||||||
|
threads[i]->has_wake_signal = true;
|
||||||
|
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
|
||||||
|
if (!isActive)
|
||||||
|
{
|
||||||
|
pthread_cond_broadcast/*pthread_cond_signal*/(&threads[i]->cond_thread_wake); // wake thread
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
CV_Assert(threads[i]->job.empty());
|
||||||
|
threads[i]->job = job;
|
||||||
|
threads[i]->dont_wait = true;
|
||||||
|
threads[i]->has_wake_signal = true;
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
threads_stat[i + 1].reset();
|
||||||
|
#endif
|
||||||
|
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
|
||||||
|
pthread_cond_broadcast/*pthread_cond_signal*/(&threads[i]->cond_thread_wake); // wake thread
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
}
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
threads_stat[0].threadPing = getTickCount();
|
||||||
|
#endif
|
||||||
|
#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
|
||||||
|
pthread_cond_broadcast(&cond_thread_wake); // wake all threads
|
||||||
|
#endif
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
threads_stat[0].threadWake = getTickCount();
|
||||||
|
#endif
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "MainThread: wake worker threads... (done)");
|
||||||
|
|
||||||
|
{
|
||||||
|
ParallelJob& j = *(this->job);
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
threads_stat[0].threadExecuteStart = getTickCount();
|
||||||
|
threads_stat[0].executedTasks = j.execute(false);
|
||||||
|
threads_stat[0].threadExecuteStop = getTickCount();
|
||||||
|
#else
|
||||||
|
j.execute(false);
|
||||||
|
#endif
|
||||||
|
CV_Assert(j.current_task >= j.range.size());
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "MainThread: complete self-tasks: " << j.active_thread_count << " " << j.completed_thread_count);
|
||||||
|
if (job->is_completed || j.active_thread_count == 0)
|
||||||
|
{
|
||||||
|
job->is_completed = true;
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "MainThread: no WIP worker threads");
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
if (CV_MAIN_THREAD_ACTIVE_WAIT > 0)
|
||||||
|
{
|
||||||
|
for (int i = 0; i < CV_MAIN_THREAD_ACTIVE_WAIT; i++) // don't spin too much in any case (inaccurate getTickCount())
|
||||||
|
{
|
||||||
|
if (job->is_completed)
|
||||||
|
{
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "MainThread: job finalize (active wait) " << j.active_thread_count << " " << j.completed_thread_count);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
if (CV_ACTIVE_WAIT_PAUSE_LIMIT > 0 && (i < CV_ACTIVE_WAIT_PAUSE_LIMIT || (i & 1)))
|
||||||
|
CV_PAUSE(16);
|
||||||
|
else
|
||||||
|
CV_YIELD();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if (!job->is_completed)
|
||||||
|
{
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "MainThread: prepare wait " << j.active_thread_count << " " << j.completed_thread_count);
|
||||||
|
pthread_mutex_lock(&mutex_notify);
|
||||||
|
for (;;)
|
||||||
|
{
|
||||||
|
if (job->is_completed)
|
||||||
|
{
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "MainThread: job finalize (wait) " << j.active_thread_count << " " << j.completed_thread_count);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "MainThread: wait completion (sleep) ...");
|
||||||
|
pthread_cond_wait(&cond_thread_task_complete, &mutex_notify);
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "MainThread: wake");
|
||||||
|
}
|
||||||
|
pthread_mutex_unlock(&mutex_notify);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
#ifdef CV_PROFILE_THREADS
|
||||||
|
threads_stat[0].threadFree = getTickCount();
|
||||||
|
std::cout << "Job: sz=" << range.size() << " nstripes=" << nstripes << " Time: " << (threads_stat[0].threadFree - jobSubmitTime) / tickFreq * 1e6 << " usec" << std::endl;
|
||||||
|
for (int i = 0; i < (int)threads.size() + 1; i++)
|
||||||
|
{
|
||||||
|
threads_stat[i].dump(i - 1, jobSubmitTime, tickFreq);
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
if (job)
|
||||||
|
{
|
||||||
|
pthread_mutex_lock(&mutex);
|
||||||
|
CV_LOG_VERBOSE(NULL, 5, "MainThread: job release");
|
||||||
|
CV_Assert(job->is_completed);
|
||||||
|
job.release();
|
||||||
|
pthread_mutex_unlock(&mutex);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
body(range);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
size_t ThreadPool::getNumOfThreads()
|
||||||
|
{
|
||||||
|
return num_threads;
|
||||||
|
}
|
||||||
|
|
||||||
|
void ThreadPool::setNumOfThreads(unsigned n)
|
||||||
|
{
|
||||||
|
if (n != num_threads)
|
||||||
|
{
|
||||||
|
num_threads = n;
|
||||||
|
if (n == 1)
|
||||||
|
if (job == NULL) reconfigure(0); // stop worker threads immediatelly
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
size_t parallel_pthreads_get_threads_num()
|
||||||
|
{
|
||||||
|
return ThreadPool::instance().getNumOfThreads();
|
||||||
|
}
|
||||||
|
|
||||||
|
void parallel_pthreads_set_threads_num(int num)
|
||||||
|
{
|
||||||
|
if(num < 0)
|
||||||
|
{
|
||||||
|
ThreadPool::instance().setNumOfThreads(0);
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
ThreadPool::instance().setNumOfThreads(unsigned(num));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void parallel_for_pthreads(const Range& range, const ParallelLoopBody& body, double nstripes)
|
||||||
|
{
|
||||||
|
ThreadPool::instance().run(range, body, nstripes);
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
#endif
|
||||||
17
modules/core/src/parallel_impl.hpp
Normal file
17
modules/core/src/parallel_impl.hpp
Normal file
@ -0,0 +1,17 @@
|
|||||||
|
// This file is part of OpenCV project.
|
||||||
|
// It is subject to the license terms in the LICENSE file found in the top-level directory
|
||||||
|
// of this distribution and at http://opencv.org/license.html.
|
||||||
|
#ifndef OPENCV_CORE_PARALLEL_IMPL_HPP
|
||||||
|
#define OPENCV_CORE_PARALLEL_IMPL_HPP
|
||||||
|
|
||||||
|
namespace cv {
|
||||||
|
|
||||||
|
unsigned defaultNumberOfThreads();
|
||||||
|
|
||||||
|
void parallel_for_pthreads(const Range& range, const ParallelLoopBody& body, double nstripes);
|
||||||
|
size_t parallel_pthreads_get_threads_num();
|
||||||
|
void parallel_pthreads_set_threads_num(int num);
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
#endif // OPENCV_CORE_PARALLEL_IMPL_HPP
|
||||||
@ -1,581 +0,0 @@
|
|||||||
/*M///////////////////////////////////////////////////////////////////////////////////////
|
|
||||||
//
|
|
||||||
// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
|
|
||||||
//
|
|
||||||
// By downloading, copying, installing or using the software you agree to this license.
|
|
||||||
// If you do not agree to this license, do not download, install,
|
|
||||||
// copy or use the software.
|
|
||||||
//
|
|
||||||
//
|
|
||||||
// License Agreement
|
|
||||||
// For Open Source Computer Vision Library
|
|
||||||
//
|
|
||||||
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
|
|
||||||
// Copyright (C) 2009-2011, Willow Garage Inc., all rights reserved.
|
|
||||||
// Third party copyrights are property of their respective owners.
|
|
||||||
//
|
|
||||||
// Redistribution and use in source and binary forms, with or without modification,
|
|
||||||
// are permitted provided that the following conditions are met:
|
|
||||||
//
|
|
||||||
// * Redistribution's of source code must retain the above copyright notice,
|
|
||||||
// this list of conditions and the following disclaimer.
|
|
||||||
//
|
|
||||||
// * Redistribution's in binary form must reproduce the above copyright notice,
|
|
||||||
// this list of conditions and the following disclaimer in the documentation
|
|
||||||
// and/or other materials provided with the distribution.
|
|
||||||
//
|
|
||||||
// * The name of the copyright holders may not be used to endorse or promote products
|
|
||||||
// derived from this software without specific prior written permission.
|
|
||||||
//
|
|
||||||
// This software is provided by the copyright holders and contributors "as is" and
|
|
||||||
// any express or implied warranties, including, but not limited to, the implied
|
|
||||||
// warranties of merchantability and fitness for a particular purpose are disclaimed.
|
|
||||||
// In no event shall the Intel Corporation or contributors be liable for any direct,
|
|
||||||
// indirect, incidental, special, exemplary, or consequential damages
|
|
||||||
// (including, but not limited to, procurement of substitute goods or services;
|
|
||||||
// loss of use, data, or profits; or business interruption) however caused
|
|
||||||
// and on any theory of liability, whether in contract, strict liability,
|
|
||||||
// or tort (including negligence or otherwise) arising in any way out of
|
|
||||||
// the use of this software, even if advised of the possibility of such damage.
|
|
||||||
//
|
|
||||||
//M*/
|
|
||||||
|
|
||||||
#include "precomp.hpp"
|
|
||||||
|
|
||||||
#ifdef HAVE_PTHREADS_PF
|
|
||||||
|
|
||||||
#include <algorithm>
|
|
||||||
#include <pthread.h>
|
|
||||||
|
|
||||||
namespace cv
|
|
||||||
{
|
|
||||||
|
|
||||||
class ThreadManager;
|
|
||||||
|
|
||||||
enum ForThreadState
|
|
||||||
{
|
|
||||||
eFTNotStarted = 0,
|
|
||||||
eFTStarted = 1,
|
|
||||||
eFTToStop = 2,
|
|
||||||
eFTStoped = 3
|
|
||||||
};
|
|
||||||
|
|
||||||
enum ThreadManagerPoolState
|
|
||||||
{
|
|
||||||
eTMNotInited = 0,
|
|
||||||
eTMFailedToInit = 1,
|
|
||||||
eTMInited = 2,
|
|
||||||
eTMSingleThreaded = 3
|
|
||||||
};
|
|
||||||
|
|
||||||
struct work_load
|
|
||||||
{
|
|
||||||
work_load()
|
|
||||||
{
|
|
||||||
clear();
|
|
||||||
}
|
|
||||||
|
|
||||||
work_load(const cv::Range& range, const cv::ParallelLoopBody& body, int nstripes)
|
|
||||||
{
|
|
||||||
set(range, body, nstripes);
|
|
||||||
}
|
|
||||||
|
|
||||||
void set(const cv::Range& range, const cv::ParallelLoopBody& body, unsigned int nstripes)
|
|
||||||
{
|
|
||||||
m_body = &body;
|
|
||||||
m_range = ⦥
|
|
||||||
|
|
||||||
//ensure that nstripes not larger than range length
|
|
||||||
m_nstripes = std::min( unsigned(m_range->end - m_range->start) , nstripes);
|
|
||||||
|
|
||||||
m_block_size = ((m_range->end - m_range->start - 1)/m_nstripes) + 1;
|
|
||||||
|
|
||||||
//ensure that nstripes not larger than blocks count, so we would never go out of range
|
|
||||||
m_nstripes = std::min(m_nstripes, unsigned(((m_range->end - m_range->start - 1)/m_block_size) + 1) );
|
|
||||||
}
|
|
||||||
|
|
||||||
const cv::ParallelLoopBody* m_body;
|
|
||||||
const cv::Range* m_range;
|
|
||||||
unsigned int m_nstripes;
|
|
||||||
int m_block_size;
|
|
||||||
|
|
||||||
void clear()
|
|
||||||
{
|
|
||||||
m_body = 0;
|
|
||||||
m_range = 0;
|
|
||||||
m_nstripes = 0;
|
|
||||||
m_block_size = 0;
|
|
||||||
}
|
|
||||||
};
|
|
||||||
|
|
||||||
class ForThread
|
|
||||||
{
|
|
||||||
public:
|
|
||||||
|
|
||||||
ForThread(): m_posix_thread(0), m_task_start(false), m_parent(0), m_state(eFTNotStarted), m_id(0)
|
|
||||||
{
|
|
||||||
}
|
|
||||||
|
|
||||||
//called from manager thread
|
|
||||||
bool init(size_t id, ThreadManager* parent);
|
|
||||||
|
|
||||||
//called from manager thread
|
|
||||||
void run();
|
|
||||||
|
|
||||||
//called from manager thread
|
|
||||||
void stop();
|
|
||||||
|
|
||||||
~ForThread();
|
|
||||||
|
|
||||||
private:
|
|
||||||
|
|
||||||
//called from worker thread
|
|
||||||
static void* thread_loop_wrapper(void* thread_object);
|
|
||||||
|
|
||||||
//called from worker thread
|
|
||||||
void execute();
|
|
||||||
|
|
||||||
//called from worker thread
|
|
||||||
void thread_body();
|
|
||||||
|
|
||||||
pthread_t m_posix_thread;
|
|
||||||
pthread_mutex_t m_thread_mutex;
|
|
||||||
pthread_cond_t m_cond_thread_task;
|
|
||||||
volatile bool m_task_start;
|
|
||||||
|
|
||||||
ThreadManager* m_parent;
|
|
||||||
volatile ForThreadState m_state;
|
|
||||||
size_t m_id;
|
|
||||||
};
|
|
||||||
|
|
||||||
class ThreadManager
|
|
||||||
{
|
|
||||||
public:
|
|
||||||
friend class ForThread;
|
|
||||||
|
|
||||||
static ThreadManager& instance()
|
|
||||||
{
|
|
||||||
CV_SINGLETON_LAZY_INIT_REF(ThreadManager, new ThreadManager())
|
|
||||||
}
|
|
||||||
|
|
||||||
static void stop()
|
|
||||||
{
|
|
||||||
ThreadManager& manager = instance();
|
|
||||||
|
|
||||||
if(manager.m_pool_state == eTMInited)
|
|
||||||
{
|
|
||||||
for(size_t i = 0; i < manager.m_num_threads; ++i)
|
|
||||||
{
|
|
||||||
manager.m_threads[i].stop();
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
manager.m_pool_state = eTMNotInited;
|
|
||||||
}
|
|
||||||
|
|
||||||
void run(const cv::Range& range, const cv::ParallelLoopBody& body, double nstripes);
|
|
||||||
|
|
||||||
size_t getNumOfThreads();
|
|
||||||
|
|
||||||
void setNumOfThreads(size_t n);
|
|
||||||
|
|
||||||
private:
|
|
||||||
|
|
||||||
ThreadManager();
|
|
||||||
|
|
||||||
~ThreadManager();
|
|
||||||
|
|
||||||
void wait_complete();
|
|
||||||
|
|
||||||
void notify_complete();
|
|
||||||
|
|
||||||
bool initPool();
|
|
||||||
|
|
||||||
size_t defaultNumberOfThreads();
|
|
||||||
|
|
||||||
std::vector<ForThread> m_threads;
|
|
||||||
size_t m_num_threads;
|
|
||||||
|
|
||||||
pthread_mutex_t m_manager_task_mutex;
|
|
||||||
pthread_cond_t m_cond_thread_task_complete;
|
|
||||||
bool m_task_complete;
|
|
||||||
|
|
||||||
unsigned int m_task_position;
|
|
||||||
unsigned int m_num_of_completed_tasks;
|
|
||||||
|
|
||||||
pthread_mutex_t m_manager_access_mutex;
|
|
||||||
|
|
||||||
static const char m_env_name[];
|
|
||||||
|
|
||||||
work_load m_work_load;
|
|
||||||
|
|
||||||
struct work_thread_t
|
|
||||||
{
|
|
||||||
work_thread_t(): value(false) { }
|
|
||||||
bool value;
|
|
||||||
};
|
|
||||||
|
|
||||||
cv::TLSData<work_thread_t> m_is_work_thread;
|
|
||||||
|
|
||||||
ThreadManagerPoolState m_pool_state;
|
|
||||||
};
|
|
||||||
|
|
||||||
const char ThreadManager::m_env_name[] = "OPENCV_FOR_THREADS_NUM";
|
|
||||||
|
|
||||||
ForThread::~ForThread()
|
|
||||||
{
|
|
||||||
if(m_state == eFTStarted)
|
|
||||||
{
|
|
||||||
stop();
|
|
||||||
|
|
||||||
pthread_mutex_destroy(&m_thread_mutex);
|
|
||||||
|
|
||||||
pthread_cond_destroy(&m_cond_thread_task);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
bool ForThread::init(size_t id, ThreadManager* parent)
|
|
||||||
{
|
|
||||||
m_id = id;
|
|
||||||
|
|
||||||
m_parent = parent;
|
|
||||||
|
|
||||||
int res = 0;
|
|
||||||
|
|
||||||
res |= pthread_mutex_init(&m_thread_mutex, NULL);
|
|
||||||
|
|
||||||
res |= pthread_cond_init(&m_cond_thread_task, NULL);
|
|
||||||
|
|
||||||
if(!res)
|
|
||||||
{
|
|
||||||
res = pthread_create(&m_posix_thread, NULL, thread_loop_wrapper, (void*)this);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
return res == 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
void ForThread::stop()
|
|
||||||
{
|
|
||||||
if(m_state == eFTStarted)
|
|
||||||
{
|
|
||||||
pthread_mutex_lock(&m_thread_mutex);
|
|
||||||
m_state = eFTToStop;
|
|
||||||
pthread_mutex_unlock(&m_thread_mutex);
|
|
||||||
|
|
||||||
run();
|
|
||||||
|
|
||||||
pthread_join(m_posix_thread, NULL);
|
|
||||||
}
|
|
||||||
|
|
||||||
pthread_mutex_lock(&m_thread_mutex);
|
|
||||||
m_state = eFTStoped;
|
|
||||||
pthread_mutex_unlock(&m_thread_mutex);
|
|
||||||
}
|
|
||||||
|
|
||||||
void ForThread::run()
|
|
||||||
{
|
|
||||||
pthread_mutex_lock(&m_thread_mutex);
|
|
||||||
|
|
||||||
m_task_start = true;
|
|
||||||
|
|
||||||
pthread_cond_signal(&m_cond_thread_task);
|
|
||||||
|
|
||||||
pthread_mutex_unlock(&m_thread_mutex);
|
|
||||||
}
|
|
||||||
|
|
||||||
void* ForThread::thread_loop_wrapper(void* thread_object)
|
|
||||||
{
|
|
||||||
((ForThread*)thread_object)->thread_body();
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
void ForThread::execute()
|
|
||||||
{
|
|
||||||
unsigned int m_current_pos = CV_XADD(&m_parent->m_task_position, 1);
|
|
||||||
|
|
||||||
work_load& load = m_parent->m_work_load;
|
|
||||||
|
|
||||||
while(m_current_pos < load.m_nstripes)
|
|
||||||
{
|
|
||||||
int start = load.m_range->start + m_current_pos*load.m_block_size;
|
|
||||||
int end = std::min(start + load.m_block_size, load.m_range->end);
|
|
||||||
|
|
||||||
load.m_body->operator()(cv::Range(start, end));
|
|
||||||
|
|
||||||
m_current_pos = CV_XADD(&m_parent->m_task_position, 1);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
void ForThread::thread_body()
|
|
||||||
{
|
|
||||||
(void)cv::utils::getThreadID(); // notify OpenCV about new thread
|
|
||||||
|
|
||||||
m_parent->m_is_work_thread.get()->value = true;
|
|
||||||
|
|
||||||
pthread_mutex_lock(&m_thread_mutex);
|
|
||||||
|
|
||||||
m_state = eFTStarted;
|
|
||||||
|
|
||||||
while(m_state == eFTStarted)
|
|
||||||
{
|
|
||||||
//to handle spurious wakeups
|
|
||||||
while( !m_task_start && m_state != eFTToStop )
|
|
||||||
pthread_cond_wait(&m_cond_thread_task, &m_thread_mutex);
|
|
||||||
|
|
||||||
if(m_state == eFTStarted)
|
|
||||||
{
|
|
||||||
execute();
|
|
||||||
|
|
||||||
m_task_start = false;
|
|
||||||
|
|
||||||
m_parent->notify_complete();
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
pthread_mutex_unlock(&m_thread_mutex);
|
|
||||||
}
|
|
||||||
|
|
||||||
ThreadManager::ThreadManager(): m_num_threads(0), m_task_complete(false), m_num_of_completed_tasks(0), m_pool_state(eTMNotInited)
|
|
||||||
{
|
|
||||||
int res = 0;
|
|
||||||
|
|
||||||
pthread_mutexattr_t attr;
|
|
||||||
pthread_mutexattr_init(&attr);
|
|
||||||
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
|
|
||||||
res |= pthread_mutex_init(&m_manager_access_mutex, &attr);
|
|
||||||
pthread_mutexattr_destroy(&attr);
|
|
||||||
|
|
||||||
res |= pthread_mutex_init(&m_manager_task_mutex, NULL);
|
|
||||||
|
|
||||||
res |= pthread_cond_init(&m_cond_thread_task_complete, NULL);
|
|
||||||
|
|
||||||
if(!res)
|
|
||||||
{
|
|
||||||
setNumOfThreads(defaultNumberOfThreads());
|
|
||||||
|
|
||||||
m_task_position = 0;
|
|
||||||
}
|
|
||||||
else
|
|
||||||
{
|
|
||||||
m_num_threads = 1;
|
|
||||||
m_pool_state = eTMFailedToInit;
|
|
||||||
m_task_position = 0;
|
|
||||||
|
|
||||||
//print error;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
ThreadManager::~ThreadManager()
|
|
||||||
{
|
|
||||||
stop();
|
|
||||||
|
|
||||||
pthread_mutex_destroy(&m_manager_task_mutex);
|
|
||||||
|
|
||||||
pthread_cond_destroy(&m_cond_thread_task_complete);
|
|
||||||
|
|
||||||
pthread_mutex_destroy(&m_manager_access_mutex);
|
|
||||||
}
|
|
||||||
|
|
||||||
void ThreadManager::run(const cv::Range& range, const cv::ParallelLoopBody& body, double nstripes)
|
|
||||||
{
|
|
||||||
bool is_work_thread = m_is_work_thread.get()->value;
|
|
||||||
|
|
||||||
if( (getNumOfThreads() > 1) && !is_work_thread &&
|
|
||||||
(range.end - range.start > 1) && (nstripes <= 0 || nstripes >= 1.5) )
|
|
||||||
{
|
|
||||||
int res = pthread_mutex_trylock(&m_manager_access_mutex);
|
|
||||||
|
|
||||||
if(!res)
|
|
||||||
{
|
|
||||||
if(initPool())
|
|
||||||
{
|
|
||||||
if(nstripes < 1) nstripes = 4*m_threads.size();
|
|
||||||
|
|
||||||
double max_stripes = 4*m_threads.size();
|
|
||||||
|
|
||||||
nstripes = std::min(nstripes, max_stripes);
|
|
||||||
|
|
||||||
pthread_mutex_lock(&m_manager_task_mutex);
|
|
||||||
|
|
||||||
m_num_of_completed_tasks = 0;
|
|
||||||
|
|
||||||
m_task_position = 0;
|
|
||||||
|
|
||||||
m_task_complete = false;
|
|
||||||
|
|
||||||
m_work_load.set(range, body, cvCeil(nstripes));
|
|
||||||
|
|
||||||
for(size_t i = 0; i < m_threads.size(); ++i)
|
|
||||||
{
|
|
||||||
m_threads[i].run();
|
|
||||||
}
|
|
||||||
|
|
||||||
wait_complete();
|
|
||||||
}
|
|
||||||
else
|
|
||||||
{
|
|
||||||
//print error
|
|
||||||
body(range);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
else
|
|
||||||
{
|
|
||||||
body(range);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
else
|
|
||||||
{
|
|
||||||
body(range);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
void ThreadManager::wait_complete()
|
|
||||||
{
|
|
||||||
//to handle spurious wakeups
|
|
||||||
while(!m_task_complete)
|
|
||||||
pthread_cond_wait(&m_cond_thread_task_complete, &m_manager_task_mutex);
|
|
||||||
|
|
||||||
pthread_mutex_unlock(&m_manager_task_mutex);
|
|
||||||
|
|
||||||
pthread_mutex_unlock(&m_manager_access_mutex);
|
|
||||||
}
|
|
||||||
|
|
||||||
void ThreadManager::notify_complete()
|
|
||||||
{
|
|
||||||
|
|
||||||
unsigned int comp = CV_XADD(&m_num_of_completed_tasks, 1);
|
|
||||||
|
|
||||||
if(comp == (m_num_threads - 1))
|
|
||||||
{
|
|
||||||
pthread_mutex_lock(&m_manager_task_mutex);
|
|
||||||
|
|
||||||
m_task_complete = true;
|
|
||||||
|
|
||||||
pthread_cond_signal(&m_cond_thread_task_complete);
|
|
||||||
|
|
||||||
pthread_mutex_unlock(&m_manager_task_mutex);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
bool ThreadManager::initPool()
|
|
||||||
{
|
|
||||||
if(m_pool_state != eTMNotInited || m_num_threads == 1)
|
|
||||||
return true;
|
|
||||||
|
|
||||||
m_threads.resize(m_num_threads);
|
|
||||||
|
|
||||||
bool res = true;
|
|
||||||
|
|
||||||
for(size_t i = 0; i < m_threads.size(); ++i)
|
|
||||||
{
|
|
||||||
res |= m_threads[i].init(i, this);
|
|
||||||
}
|
|
||||||
|
|
||||||
if(res)
|
|
||||||
{
|
|
||||||
m_pool_state = eTMInited;
|
|
||||||
}
|
|
||||||
else
|
|
||||||
{
|
|
||||||
//TODO: join threads?
|
|
||||||
m_pool_state = eTMFailedToInit;
|
|
||||||
}
|
|
||||||
|
|
||||||
return res;
|
|
||||||
}
|
|
||||||
|
|
||||||
size_t ThreadManager::getNumOfThreads()
|
|
||||||
{
|
|
||||||
return m_num_threads;
|
|
||||||
}
|
|
||||||
|
|
||||||
void ThreadManager::setNumOfThreads(size_t n)
|
|
||||||
{
|
|
||||||
int res = pthread_mutex_lock(&m_manager_access_mutex);
|
|
||||||
|
|
||||||
if(!res)
|
|
||||||
{
|
|
||||||
if(n == 0)
|
|
||||||
{
|
|
||||||
n = defaultNumberOfThreads();
|
|
||||||
}
|
|
||||||
|
|
||||||
if(n != m_num_threads && m_pool_state != eTMFailedToInit)
|
|
||||||
{
|
|
||||||
if(m_pool_state == eTMInited)
|
|
||||||
{
|
|
||||||
stop();
|
|
||||||
m_threads.clear();
|
|
||||||
}
|
|
||||||
|
|
||||||
m_num_threads = n;
|
|
||||||
|
|
||||||
if(m_num_threads == 1)
|
|
||||||
{
|
|
||||||
m_pool_state = eTMSingleThreaded;
|
|
||||||
}
|
|
||||||
else
|
|
||||||
{
|
|
||||||
m_pool_state = eTMNotInited;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
pthread_mutex_unlock(&m_manager_access_mutex);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
size_t ThreadManager::defaultNumberOfThreads()
|
|
||||||
{
|
|
||||||
#ifdef __ANDROID__
|
|
||||||
// many modern phones/tables have 4-core CPUs. Let's use no more
|
|
||||||
// than 2 threads by default not to overheat the devices
|
|
||||||
const unsigned int default_number_of_threads = 2;
|
|
||||||
#else
|
|
||||||
const unsigned int default_number_of_threads = (unsigned int)std::max(1, cv::getNumberOfCPUs());
|
|
||||||
#endif
|
|
||||||
|
|
||||||
unsigned int result = default_number_of_threads;
|
|
||||||
|
|
||||||
char * env = getenv(m_env_name);
|
|
||||||
|
|
||||||
if(env != NULL)
|
|
||||||
{
|
|
||||||
sscanf(env, "%u", &result);
|
|
||||||
|
|
||||||
result = std::max(1u, result);
|
|
||||||
//do we need upper limit of threads number?
|
|
||||||
}
|
|
||||||
|
|
||||||
return result;
|
|
||||||
}
|
|
||||||
|
|
||||||
void parallel_for_pthreads(const cv::Range& range, const cv::ParallelLoopBody& body, double nstripes);
|
|
||||||
size_t parallel_pthreads_get_threads_num();
|
|
||||||
void parallel_pthreads_set_threads_num(int num);
|
|
||||||
|
|
||||||
size_t parallel_pthreads_get_threads_num()
|
|
||||||
{
|
|
||||||
return ThreadManager::instance().getNumOfThreads();
|
|
||||||
}
|
|
||||||
|
|
||||||
void parallel_pthreads_set_threads_num(int num)
|
|
||||||
{
|
|
||||||
if(num < 0)
|
|
||||||
{
|
|
||||||
ThreadManager::instance().setNumOfThreads(0);
|
|
||||||
}
|
|
||||||
else
|
|
||||||
{
|
|
||||||
ThreadManager::instance().setNumOfThreads(size_t(num));
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
void parallel_for_pthreads(const cv::Range& range, const cv::ParallelLoopBody& body, double nstripes)
|
|
||||||
{
|
|
||||||
ThreadManager::instance().run(range, body, nstripes);
|
|
||||||
}
|
|
||||||
|
|
||||||
}
|
|
||||||
|
|
||||||
#endif
|
|
||||||
Loading…
Reference in New Issue
Block a user