diff --git a/Profiling-OpenCV-Applications.md b/Profiling-OpenCV-Applications.md new file mode 100644 index 0000000..b942afd --- /dev/null +++ b/Profiling-OpenCV-Applications.md @@ -0,0 +1,96 @@ +OpenCV provides an tracing facility for efficient development of Computer Vision Applications. + +Tracing framework is built-in directly into the OpenCV source code. To use it, you only need to compile and link your application with modern version of OpenCV. + +To profile your application you can use these [OpenCV Tracing macro](#tracing-macro-list). +Important macro are: +- `CV_TRACE_FUNCTION()` - put this in the beginning of your function +- `CV_TRACE_REGION("process")` - use this for scope-based region tracing (useful for "for loops") + +For usage example please refer to OpenCV example ([application_trace.cpp](https://github.com/alalek/opencv/blob/trace/samples/cpp/application_trace.cpp)) with using of OpenCV Tracing API. + + +OpenCV tracing relies on the Instrumentation and Tracing Technology (ITT) API, an Intel®-provided profiling framework (https://software.intel.com/en-us/articles/intel-itt-api-open-source). + +You can analyze data generated via the ITT API backend using these tools: +- Intel® VTune™ Amplifier +- Intel® Single Event API (Intel® SEAPI) + +An alternative to the ITT-based instrumentation, is to trace the OpenCV calls in the compact machine-readable text form. This approach is useful for cases when external tools (like Intel® VTune™ Amplifier) cannot be used or you are willing to parse and analyze traces in some custom way. + +Notice that only performance relevant set of the OpenCV functions is traced to avoid bloating of the timeline view. + +## Using VTune™ performance profiler tool + +Tool site: https://software.intel.com/en-us/intel-vtune-amplifier-xe + +The handiest way to collect a trace is to run your application under control of Intel® VTune™ Amplifier. With VTune™ you can correlate your OpenCV activity with various important metrics for CPU and GPU. Finally, VTune™ captures most Intel APIs beyond OpenCV, for example OpenCL. So with these tools you can see when OpenCV calls are translated into OpenCL tasks. + +Just run analyzed OpenCV Application under Intel® VTune™ Amplifier with enabled "Analyze user tasks" option. + +[[images/trace-vtune-option.png|VTune option]] + +Result view ("Platform" tab): + +[[images/trace-vtune-result.png|VTune result view]] + + +## Using Intel® SEAPI + +Tool Site: https://github.com/01org/IntelSEAPI + +Intel® SEAPI is the translator of itt_notify calls into several OS specific and third party tracing formats. + +- Download (or clone) project repository files +- Build tool. Refer to tool's site documentation how to build it. +- Run OpenCV Application via Intel® SEAPI wrapper to collect tracing information and generate google trace file in json format: +``` +python /runtool/sea_runtool.py -o ocv-trace -f gt ! ./bin/cpp-example-application_trace +``` +- You can open result file (ocv-trace.pid-NNNNN.zip/.json) via Google Chrome / Chromium browser: open URL "about://tracing" + +High level trace results: + +[[images/trace-frame.png|High level trace results]] + +"Process" region: + +[[images/trace-frame-process.png|High level trace results]] + +View with detailed traces: + +[[images/trace-details.png|Detailed trace results]] + +There is an example result file ([.zip](data/ocv-trace.zip) / [.json](data/ocv-trace-0.json)) with collected Application calls traces via Intel® SEAPI tool (to play with it, just open "about://tracing" URL and load this file) + +## Alternative collection of trace information for custom analyzing + +You can collect trace of the OpenCV calls in the compact machine-readable text form for custom analysis. + +Run application with `OPENCV_TRACE=1` environment variable. You will receive trace dump in a set of `OpenCVTrace.txt` files. You can control location and name of result trace dump files via `OPENCV_TRACE_LOCATION` environment variable. + +You can use OpenCV-bundled trace analyzer tool: "trace_profiler.py" (located in modules/ts/misc) to get highlighted calls of your application. + +[[images/opencv-trace-analyze.png]] + +## Tracing runtime options + +Runtime options can be specified via environment variables. + +- `OPENCV_TRACE` - enables OpenCV tracing. By default tracing is turned off. It automatically enables on active ITT backend on startup. +- `OPENCV_TRACE_LOCATION` - storage path to store OpenCV trace. +- `OPENCV_TRACE_DEPTH_OPENCV` - specify trace depth of OpenCV functions + - 0 - infinite call depth + - 1 - trace OpenCV entry points (default) +- `OPENCV_TRACE_MAX_CHILDREN` - limit number of traced children (useful to ignore functions with large loops) +- `OPENCV_TRACE_MAX_CHILDREN_OPENCV` - limit number of traced children for OpenCV calls +- `OPENCV_TRACE_SYNC_OPENCL` - force `clFinish` calls in the end of OpenCV regions (performance impact, default value is `0`) + +## Tracing macro list + +- `CV_TRACE_FUNCTION()` - trace function. +- `CV_TRACE_FUNCTION_SKIP_NESTED` - trace current function, but skip all nested regions. Use this for non-critical functions (like data load or validation) to reduce trace log. +- `CV_TRACE_REGION("myregion")` - C++ scoped region trace. +- `CV_TRACE_REGION_NEXT("next_step")` - change current region (in the same C++ scope). Useful to trace region consequences (step1/step2/../stepN). +- `CV_TRACE_ARG(arg)` - trace argument value (or other variable). Supported `double`/`int64`/`int`/`const char*` data types. Currently tracing of argument values is supported for ITT backend only. +- `CV_TRACE_ARG_VALUE(width_id, "width", size.width())` - expanded version of `CV_TRACE_ARG`. \ No newline at end of file diff --git a/data/ocv-trace-0.json b/data/ocv-trace-0.json new file mode 100644 index 0000000..9d64ebc --- /dev/null +++ b/data/ocv-trace-0.json @@ -0,0 +1,11818 @@ +{ +"traceEvents": [ +{"name": "thread_name", "ph":"M", "pid":29753, "tid":29763, "args": {"name":"OpenCVThread-001(29763)"}}, +{"name": "thread_name", "ph":"M", "pid":29753, "tid":29762, "args": {"name":"OpenCVThread-003(29762)"}}, +{"name": "thread_name", "ph":"M", "pid":29753, "tid":29765, "args": {"name":"OpenCVThread-002(29765)"}}, +{"name": "thread_name", "ph":"M", "pid":29753, "tid":29764, "args": {"name":"OpenCVThread-004(29764)"}}, +{"name": "thread_name", "ph":"M", "pid":29753, "tid":29753, "args": {"name":"OpenCVThread-000(29753)"}}, +{"name": "process_name", "ph":"M", "pid":29753, "tid":29753, "args": 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