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gabor@google.com ccf0fcd5c2 A number of smaller fixes and performance improvements: 
- Implemented Get() directly instead of building on top of a full
  merging iterator stack.  This speeds up the "readrandom" benchmark
  by up to 15-30%.

- Fixed an opensource compilation problem.
  Added --db=<name> flag to control where the database is placed.

- Automatically compact a file when we have done enough
  overlapping seeks to that file.

- Fixed a performance bug where we would read from at least one
  file in a level even if none of the files overlapped the key
  being read.

- Makefile fix for Mac OSX installations that have XCode 4 without XCode 3.

- Unified the two occurrences of binary search in a file-list
  into one routine.

- Found and fixed a bug where we would unnecessarily search the
  last file when looking for a key larger than all data in the
  level.

- A fix to avoid the need for trivial move compactions and
  therefore gets rid of two out of five syncs in "fillseq".

- Removed the MANIFEST file write when switching to a new
  memtable/log-file for a 10-20% improvement on fill speed on ext4.

- Adding a SNAPPY setting in the Makefile for folks who have
  Snappy installed. Snappy compresses values and speeds up writes.



git-svn-id: https://leveldb.googlecode.com/svn/trunk@32 62dab493-f737-651d-591e-8d6aee1b9529
2011-06-22 02:36:45 +00:00
..
win reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00
port_android.cc reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00
port_android.h @20776309 2011-04-20 22:48:11 +00:00
port_chromium.cc reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00
port_chromium.h @20776309 2011-04-20 22:48:11 +00:00
port_example.h @20776309 2011-04-20 22:48:11 +00:00
port_osx.cc Update from upstream @21551990 2011-05-28 00:53:58 +00:00
port_osx.h Update from upstream @21551990 2011-05-28 00:53:58 +00:00
port_posix.cc reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00
port_posix.h A number of smaller fixes and performance improvements: 2011-06-22 02:36:45 +00:00
port.h Update from upstream @21551990 2011-05-28 00:53:58 +00:00
README reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00
sha1_portable.cc reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00
sha1_portable.h reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00
sha1_test.cc reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00

README 

This directory contains interfaces and implementations that isolate the
rest of the package from platform details.

Code in the rest of the package includes "port.h" from this directory.
"port.h" in turn includes a platform specific "port_<platform>.h" file
that provides the platform specific implementation.

See port_posix.h for an example of what must be provided in a platform
specific header file.