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  1. 16 8月, 2011 1 次提交
    • G
      Bugfixes for iterator and documentation. · ab323f7e
      由 gabor@google.com 提交于 
      - Fix bug in Iterator::Prev where it would return the wrong key.
  Fixes issues 29 and 30.

- Added a tweak to testharness to allow running just some tests.

- Fixing two minor documentation errors based on issues 28 and 25.

- Cleanup; fix namespaces of export-to-C code.
  Also fix one "const char*" vs "char*" mismatch.



git-svn-id: https://leveldb.googlecode.com/svn/trunk@48 62dab493-f737-651d-591e-8d6aee1b9529
      ab323f7e
  3. 06 8月, 2011 2 次提交
  5. 30 7月, 2011 1 次提交
    • G
      Improved benchmark, fixed bugs and SQLite parameters. · 1bfbe76b
      由 gabor@google.com 提交于 
      - Based on suggestions on the sqlite-users mailing list,
  we removed the superfluous index on the primary key 
  for SQLite's benchmarks, and turned write-ahead logging 
  ("WAL") on. This led to performance improvements for SQLite.

- Based on a suggestion by Florian Weimer on the leveldb
  mailing list, we disabled hard drive write-caching via
  hdparm when testing synchronous writes. This led to
  performance losses for LevelDB and Kyoto TreeDB.

- Fixed a mistake in 2.A.->Random where the bar sizes
  were switched for Kyoto TreeDB and SQLite.



git-svn-id: https://leveldb.googlecode.com/svn/trunk@45 62dab493-f737-651d-591e-8d6aee1b9529
      1bfbe76b
  7. 27 7月, 2011 5 次提交
  9. 21 7月, 2011 1 次提交
    • G
      Speed up Snappy uncompression, new Logger interface. · 60bd8015
      由 gabor@google.com 提交于 
      - Removed one copy of an uncompressed block contents changing
  the signature of Snappy_Uncompress() so it uncompresses into a
  flat array instead of a std::string.
        
  Speeds up readrandom ~10%.

- Instead of a combination of Env/WritableFile, we now have a
  Logger interface that can be easily overridden applications
  that want to supply their own logging.

- Separated out the gcc and Sun Studio parts of atomic_pointer.h
  so we can use 'asm', 'volatile' keywords for Sun Studio.




git-svn-id: https://leveldb.googlecode.com/svn/trunk@39 62dab493-f737-651d-591e-8d6aee1b9529
      60bd8015
  11. 20 7月, 2011 1 次提交
  13. 15 7月, 2011 1 次提交
    • G
      Small tweaks and bugfixes for Issue 18 and 19. · 6699c7eb
      由 gabor@google.com 提交于 
      Slight tweak to the no-overlap optimization: only push to
level 2 to reduce the amount of wasted space when the same
small key range is being repeatedly overwritten.

Fix for Issue 18: Avoid failure on Windows by avoiding
deletion of lock file until the end of DestroyDB().

Fix for Issue 19: Disregard sequence numbers when checking for 
overlap in sstable ranges. This fixes issue 19: when writing 
the same key over and over again, we would generate a sequence 
of sstables that were never merged together since their sequence
numbers were disjoint.

Don't ignore map/unmap error checks.

Miscellaneous fixes for small problems Sanjay found while diagnosing
issue/9 and issue/16 (corruption_testr failures).
- log::Reader reports the record type when it finds an unexpected type.
- log::Reader no longer reports an error when it encounters an expected
  zero record regardless of the setting of the "checksum" flag.
- Added a missing forward declaration.
- Documented a side-effects of larger write buffer sizes
  (longer recovery time).



git-svn-id: https://leveldb.googlecode.com/svn/trunk@37 62dab493-f737-651d-591e-8d6aee1b9529
      6699c7eb
  15. 01 7月, 2011 1 次提交
  17. 30 6月, 2011 1 次提交
  19. 29 6月, 2011 1 次提交
    • G
      Platform detection during build, plus compatibility patches for machines without <cstdatomic>. · f57e2335
      由 gabor@google.com 提交于 
      This revision adds two major changes:
1. build_detect_platform which generates build_config.mk
   with platform-dependent flags for the build process
2. /port/atomic_pointer.h with anAtomicPointerimplementation
   for platforms without <cstdatomic>

Some of this code is loosely based on patches submitted to the 
LevelDB mailing list at https://groups.google.com/forum/#!forum/leveldb
Tip of the hat to Dave Smith and Edouard A, who both sent patches.

The presence of Snappy (http://code.google.com/p/snappy/) and
cstdatomic are now both detected in the build_detect_platform
script (1.) which gets executing during make.

For (2.), instead of broadly importing atomicops_* from Chromium or
the Google performance tools, we chose to just implement AtomicPointer 
and the limited atomic load and store operations it needs. 
This resulted in much less code and fewer files - everything is 
contained in atomic_pointer.h.



git-svn-id: https://leveldb.googlecode.com/svn/trunk@34 62dab493-f737-651d-591e-8d6aee1b9529
      f57e2335
  21. 23 6月, 2011 1 次提交
  23. 22 6月, 2011 1 次提交
    • G
      A number of smaller fixes and performance improvements: · ccf0fcd5
      由 gabor@google.com 提交于 
      - 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
      ccf0fcd5
  25. 07 6月, 2011 1 次提交
    • H
      sync with upstream @21706995 · 80e5b0d9
      由 hans@chromium.org 提交于 
      Fixed race condition reported by Dave Smit (dizzyd@dizzyd,com)
on the leveldb mailing list.  We were not signalling
waiters after a trivial move from level-0.  The result was
that in some cases (hard to reproduce), a write would get
stuck forever waiting for the number of level-0 files to drop
below its hard limit.

The new code is simpler: there is just one condition variable
instead of two, and the condition variable is signalled after
every piece of background work finishes.  Also, all compaction
work (including for manual compactions) is done in the
background thread, and therefore we can remove the
"compacting_" variable.



git-svn-id: https://leveldb.googlecode.com/svn/trunk@31 62dab493-f737-651d-591e-8d6aee1b9529
      80e5b0d9
  27. 02 6月, 2011 1 次提交
  29. 28 5月, 2011 1 次提交
  31. 21 5月, 2011 1 次提交
  33. 03 5月, 2011 1 次提交
  35. 21 4月, 2011 3 次提交
  37. 20 4月, 2011 2 次提交
  39. 19 4月, 2011 1 次提交
  41. 13 4月, 2011 1 次提交
  43. 31 3月, 2011 2 次提交
  45. 30 3月, 2011 1 次提交
  47. 29 3月, 2011 1 次提交
  49. 26 3月, 2011 1 次提交
  51. 23 3月, 2011 3 次提交
  53. 22 3月, 2011 3 次提交