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Siying Dong 51dd21926c DB::Put() to estimate write batch data size needed and pre-allocate buffer 
Summary:
In one of CPU profiles, we see some CPU costs of string::reserve() inside Batch.Put(). This patch should be able to reduce some of the costs by allocating sufficient buffer before hand.

Since it is a trivial percentage of CPU costs, I didn't find a way to show the improvement in one of the benchmarks. I'll deploy it to same application and do the same CPU profiling to make sure those CPU costs are reduced.

Test Plan: make all check

Reviewers: haobo, kailiu, igor

Reviewed By: haobo

CC: leveldb, nkg-

Differential Revision: https://reviews.facebook.net/D15135
2014-01-14 10:53:16 -08:00
..
builder.cc Don't always compress L0 files written by memtable flush 2014-01-07 21:50:26 -08:00
builder.h Don't always compress L0 files written by memtable flush 2014-01-07 21:50:26 -08:00
c.cc C API: add rocksdb_env_set_high_priority_background_threads 2013-12-31 15:14:18 -08:00
c_test.c Rename leveldb to rocksdb in C api 2013-12-10 10:48:35 +02:00
corruption_test.cc Make "Table" pluggable 2013-10-28 17:54:09 -07:00
db_bench.cc Improve RocksDB "get" performance by computing merge result in memtable 2014-01-10 17:33:56 -08:00
db_filesnapshot.cc Support multi-threaded DisableFileDeletions() and EnableFileDeletions() 2014-01-02 03:33:42 -08:00
db_impl.cc DB::Put() to estimate write batch data size needed and pre-allocate buffer 2014-01-14 10:53:16 -08:00
db_impl.h Don't always compress L0 files written by memtable flush 2014-01-07 21:50:26 -08:00
db_impl_readonly.cc Introduce MergeContext to Lazily Initialize merge operand list 2013-12-11 11:37:28 -08:00
db_impl_readonly.h Support multi-threaded DisableFileDeletions() and EnableFileDeletions() 2014-01-02 03:33:42 -08:00
db_iter.cc Get rid of some shared_ptrs 2013-12-03 11:17:58 -08:00
db_iter.h Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
db_statistics.cc Fix #26 by putting the implementation of CreateDBStatistics() to a cc file 2013-12-05 22:29:03 -08:00
db_statistics.h Fix #26 by putting the implementation of CreateDBStatistics() to a cc file 2013-12-05 22:29:03 -08:00
db_stats_logger.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
db_test.cc Support multi-threaded DisableFileDeletions() and EnableFileDeletions() 2014-01-02 03:33:42 -08:00
dbformat.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
dbformat.h Make "Table" pluggable 2013-10-28 17:54:09 -07:00
dbformat_test.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
deletefile_test.cc Start DeleteFileTest with clean plate 2013-11-15 16:30:23 -08:00
filename.cc Unify DeleteFile and DeleteWalFiles 2013-10-25 08:32:14 -07:00
filename.h Unify DeleteFile and DeleteWalFiles 2013-10-25 08:32:14 -07:00
filename_test.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
log_format.h Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
log_reader.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
log_reader.h Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
log_test.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
log_writer.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
log_writer.h Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
memtable.cc Improve RocksDB "get" performance by computing merge result in memtable 2014-01-10 17:33:56 -08:00
memtable.h Improve RocksDB "get" performance by computing merge result in memtable 2014-01-10 17:33:56 -08:00
memtablelist.cc Introduce MergeContext to Lazily Initialize merge operand list 2013-12-11 11:37:28 -08:00
memtablelist.h Introduce MergeContext to Lazily Initialize merge operand list 2013-12-11 11:37:28 -08:00
merge_context.h Introduce MergeContext to Lazily Initialize merge operand list 2013-12-11 11:37:28 -08:00
merge_helper.cc [RocksDB] Use raw pointer instead of shared pointer when passing Statistics object internally 2013-11-25 10:38:15 -08:00
merge_helper.h [RocksDB] Use raw pointer instead of shared pointer when passing Statistics object internally 2013-11-25 10:38:15 -08:00
merge_operator.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
merge_test.cc Use ASSERT_EQ() instead of assert() in merge_test 2014-01-11 09:25:47 -08:00
perf_context_test.cc Killing Transform Rep 2013-12-03 12:42:15 -08:00
prefix_filter_iterator.h Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
prefix_test.cc Killing Transform Rep 2013-12-03 12:42:15 -08:00
repair.cc Don't always compress L0 files written by memtable flush 2014-01-07 21:50:26 -08:00
simple_table_db_test.cc Improve the "table stats" 2013-11-19 16:29:42 -08:00
skiplist.h Implementing DynamicIterator for TransformRepNoLock 2013-11-08 00:31:09 -08:00
skiplist_test.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
snapshot.h Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
table_cache.cc Hotfix the bug in table cache's GetSliceForFileNumber 2014-01-02 10:30:42 -08:00
table_cache.h Follow-up Cleaning-up After D13521 2013-10-30 10:52:33 -07:00
table_properties_collector.cc Improve the readability of the TableProperties::ToString() 2013-11-21 17:54:23 -08:00
table_properties_collector.h Improve the "table stats" 2013-11-19 16:29:42 -08:00
table_properties_collector_test.cc Move flush_block_policy from Options to TableFactory 2013-11-19 22:00:48 -08:00
transaction_log_impl.cc Fix the string format issue 2013-11-12 21:05:39 -08:00
transaction_log_impl.h Making the transaction log iterator more robust 2013-11-04 20:49:03 -08:00
version_edit.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
version_edit.h Fix the log number bug when updating MANIFEST file 2013-10-24 21:05:33 -07:00
version_edit_test.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
version_set.cc Avoid malloc in NotFound key status if no message is given. 2013-12-26 16:23:10 -08:00
version_set.h [RocksDB] Optimize locking for Get 2013-12-20 09:57:58 -08:00
version_set_reduce_num_levels.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
version_set_test.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
write_batch.cc DB::Put() to estimate write batch data size needed and pre-allocate buffer 2014-01-14 10:53:16 -08:00
write_batch_internal.h In-place updates for equal keys and similar sized values 2013-10-31 11:27:12 -07:00
write_batch_test.cc Get rid of some shared_ptrs 2013-12-03 11:17:58 -08:00