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Islam AbdelRahman 8c71eb5afc Optimize DBIter::Prev() by reducing stack overhead 
Summary:
It looks like we are spending significant amount of time creating std::deque<std::string> every time we do Iterator::Prev()

{F921567}

By using merge_operands_ as a DBIter data member w create it once and reduce this overhead and see ~30% performance improvement when using Iterator::Prev() on hot data

Orignal performance

```
DEBUG_LEVEL=0 make db_bench -j64 && ./db_bench --benchmarks="readreverse" --db="/dev/shm/bench_prev_opt/" --use_existing_db --disable_auto_compactions
readreverse  :       0.713 micros/op 1402219 ops/sec;  155.1 MB/s
readreverse  :       0.609 micros/op 1641386 ops/sec;  181.6 MB/s
readreverse  :       0.684 micros/op 1461150 ops/sec;  161.6 MB/s
readreverse  :       0.629 micros/op 1589842 ops/sec;  175.9 MB/s
readreverse  :       0.647 micros/op 1544530 ops/sec;  170.9 MB/s
```

After optimization

```
DEBUG_LEVEL=0 make db_bench -j64 && ./db_bench --benchmarks="readreverse" --db="/dev/shm/bench_prev_opt/" --use_existing_db --disable_auto_compactions
readreverse  :       0.488 micros/op 2051189 ops/sec;  226.9 MB/s
readreverse  :       0.505 micros/op 1980892 ops/sec;  219.1 MB/s
readreverse  :       0.541 micros/op 1846971 ops/sec;  204.3 MB/s
readreverse  :       0.497 micros/op 2013612 ops/sec;  222.8 MB/s
readreverse  :       0.480 micros/op 2082665 ops/sec;  230.4 MB/s
```

Test Plan: make check -j64

Reviewers: sdong, anthony, rven, igor, yhchiang

Reviewed By: yhchiang

Subscribers: jkedgar, dhruba

Differential Revision: https://reviews.facebook.net/D52563
2016-01-07 07:59:14 -08:00
..
builder.cc Use SST files for Transaction conflict detection 2015-12-11 12:34:11 -08:00
builder.h Use SST files for Transaction conflict detection 2015-12-11 12:34:11 -08:00
c_test.c Deprecate CompactionFilterV2 2015-07-17 18:59:11 +02:00
c.cc Merge pull request #916 from warrenfalk/capi_huge_page_option 2016-01-04 09:24:30 -08:00
column_family_test.cc Add ColumnFamilyHandle::GetDescriptor() 2016-01-06 18:14:01 -08:00
column_family.cc Add ColumnFamilyHandle::GetDescriptor() 2016-01-06 18:14:01 -08:00
column_family.h Add ColumnFamilyHandle::GetDescriptor() 2016-01-06 18:14:01 -08:00
compact_files_test.cc Make sure that CompactFiles does not run two parallel Level 0 compactions 2015-11-13 12:01:00 -08:00
compacted_db_impl.cc Remove db_impl_readonly dependency on utilities 2015-07-14 11:32:54 -07:00
compacted_db_impl.h Remove db_impl_readonly dependency on utilities 2015-07-14 11:32:54 -07:00
compaction_iterator_test.cc Support marking snapshots for write-conflict checking - Take 2 2015-12-08 16:47:31 -08:00
compaction_iterator.cc compaction assertion triggering test fix for sequence zeroing assertion trip 2015-12-18 16:08:31 -08:00
compaction_iterator.h Change SingleDelete to support conflict checking 2015-12-10 11:35:38 -08:00
compaction_job_stats_test.cc Fix rebase issues and new code warnings. 2015-12-11 16:56:24 -08:00
compaction_job_test.cc compaction assertion triggering test fix for sequence zeroing assertion trip 2015-12-18 16:08:31 -08:00
compaction_job.cc Merge pull request #846 from yuslepukhin/enble_c4244_lossofdata 2015-12-23 22:59:42 -08:00
compaction_job.h fix typos in comments 2015-12-11 01:54:48 +09:00
compaction_picker_test.cc Fix condition for bottommost level 2015-10-05 17:40:18 -07:00
compaction_picker.cc Report compaction reason in CompactionListener 2015-12-22 11:37:19 -08:00
compaction_picker.h Fix minor bugs in delete operator, snprintf, and size_t usage 2015-12-15 15:26:20 -08:00
compaction.cc Merge pull request #846 from yuslepukhin/enble_c4244_lossofdata 2015-12-23 22:59:42 -08:00
compaction.h Report compaction reason in CompactionListener 2015-12-22 11:37:19 -08:00
comparator_db_test.cc Moving memtable related files from util to a new directory memtable 2015-10-16 14:10:33 -07:00
convenience.cc Delete files in given key range 2015-12-29 13:22:13 -08:00
corruption_test.cc Merge pull request #846 from yuslepukhin/enble_c4244_lossofdata 2015-12-23 22:59:42 -08:00
cuckoo_table_db_test.cc Block cuckoo table tests in ROCKSDB_LITE 2015-07-20 10:50:46 -07:00
db_bench.cc Enhance db_bench write rate limit 2016-01-04 12:01:27 -08:00
db_compaction_filter_test.cc compaction assertion triggering test fix for sequence zeroing assertion trip 2015-12-18 16:08:31 -08:00
db_compaction_test.cc DeleteFilesInRange: Clean job context if no files deleted 2016-01-04 10:55:31 -08:00
db_dynamic_level_test.cc No need to #ifdef test only code on windows 2015-10-22 15:15:37 -07:00
db_filesnapshot.cc Add wal files to Checkpoint for multiple column families. 2015-06-19 16:08:31 -07:00
db_impl_debug.cc Running manual compactions in parallel with other automatic or manual compactions in restricted cases 2015-12-14 11:20:34 -08:00
db_impl_experimental.cc Clean up InstallSuperVersion 2015-06-17 12:37:59 -07:00
db_impl_readonly.cc Remove db_impl_readonly dependency on utilities 2015-07-14 11:32:54 -07:00
db_impl_readonly.h Override DBImplReadOnly::SyncWAL() to return NotSupported. Previously, calling it caused program abort. 2015-09-25 21:25:30 -07:00
db_impl.cc Optimize GetLatestSequenceForKey 2016-01-06 13:43:22 -08:00
db_impl.h Delete files in given key range 2015-12-29 13:22:13 -08:00
db_inplace_update_test.cc Clean up dependency: Move db_test_util.* to db directory 2015-10-12 13:05:42 -07:00
db_iter_test.cc No need to #ifdef test only code on windows 2015-10-22 15:15:37 -07:00
db_iter.cc Optimize DBIter::Prev() by reducing stack overhead 2016-01-07 07:59:14 -08:00
db_iter.h Introduce ReadOptions::pin_data (support zero copy for keys) 2015-12-16 12:08:30 -08:00
db_log_iter_test.cc Fix clang warnings regarding unnecessary std::move 2015-12-24 04:10:00 +08:00
db_table_properties_test.cc Avoid empty ranges vector with subsequent zero element access 2015-12-02 14:50:33 -08:00
db_tailing_iter_test.cc Fix minor bugs in delete operator, snprintf, and size_t usage 2015-12-15 15:26:20 -08:00
db_test_util.cc Merge pull request #853 from Vaisman/enable_C4267_warning 2015-12-08 17:59:24 -08:00
db_test_util.h Merge pull request #853 from Vaisman/enable_C4267_warning 2015-12-08 17:59:24 -08:00
db_test.cc fix potential test SleepingTask race condition 2016-01-06 11:51:09 -08:00
db_universal_compaction_test.cc Running manual compactions in parallel with other automatic or manual compactions in restricted cases 2015-12-14 11:20:34 -08:00
db_wal_test.cc No need to #ifdef test only code on windows 2015-10-22 15:15:37 -07:00
dbformat_test.cc Avoid manipulating const char* arrays 2015-07-14 00:21:41 -07:00
dbformat.cc Support for SingleDelete() 2015-09-17 11:42:56 -07:00
dbformat.h Introduce ReadOptions::pin_data (support zero copy for keys) 2015-12-16 12:08:30 -08:00
deletefile_test.cc Fix minor bugs in delete operator, snprintf, and size_t usage 2015-12-15 15:26:20 -08:00
event_helpers.cc Enable MS compiler warning c4244. 2015-12-11 16:47:34 -08:00
event_helpers.h Add EventListener::OnTableFileDeletion() 2015-06-03 19:57:01 -07:00
experimental.cc Implement DB::PromoteL0 method 2015-04-23 12:10:36 -07:00
fault_injection_test.cc fix sporadic failure in fault_injection_test 2016-01-06 11:51:53 -08:00
file_indexer_test.cc Fix possible SIGSEGV in CompactRange (github issue #596) 2015-04-29 10:52:31 -07:00
file_indexer.cc Fix possible SIGSEGV in CompactRange (github issue #596) 2015-04-29 10:52:31 -07:00
file_indexer.h fix typos in comments 2015-12-11 01:54:48 +09:00
filename_test.cc rocksdb: switch to gtest 2015-03-17 14:08:00 -07:00
filename.cc Enable RocksDB to persist Options file. 2015-11-10 22:58:01 -08:00
filename.h Enable RocksDB to persist Options file. 2015-11-10 22:58:01 -08:00
flush_job_test.cc Use SST files for Transaction conflict detection 2015-12-11 12:34:11 -08:00
flush_job.cc Use SST files for Transaction conflict detection 2015-12-11 12:34:11 -08:00
flush_job.h Use SST files for Transaction conflict detection 2015-12-11 12:34:11 -08:00
flush_scheduler.cc support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
flush_scheduler.h support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
forward_iterator_bench.cc Block forward_iterator_bench under MAC and Windows 2015-11-17 11:51:37 -08:00
forward_iterator.cc Fix minor bugs in delete operator, snprintf, and size_t usage 2015-12-15 15:26:20 -08:00
forward_iterator.h Reuse file iterators in tailing iterator when memtable is flushed 2015-11-13 15:50:59 -08:00
inlineskiplist_test.cc support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
inlineskiplist.h support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
internal_stats.cc support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
internal_stats.h support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
job_context.h fixed leaking log::Writers 2015-07-07 12:10:10 -07:00
listener_test.cc Report compaction reason in CompactionListener 2015-12-22 11:37:19 -08:00
log_format.h log_{reader,write}: recyclable record format 2015-10-19 17:24:05 -04:00
log_reader.cc log_{reader,write}: recyclable record format 2015-10-19 17:24:05 -04:00
log_reader.h log_{reader,write}: recyclable record format 2015-10-19 17:24:05 -04:00
log_test.cc log_{reader,write}: recyclable record format 2015-10-19 17:24:05 -04:00
log_writer.cc Enable C4267 warning 2015-11-24 16:33:09 +03:00
log_writer.h Enable C4267 warning 2015-11-24 16:33:09 +03:00
managed_iterator.cc Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
managed_iterator.h Fixed xfunc related compile errors in ROCKSDB_LITE 2015-04-09 21:05:18 -07:00
manual_compaction_test.cc Move manual_compaction_test.cc from util to db 2015-10-14 11:06:27 -07:00
memtable_allocator.cc support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
memtable_allocator.h support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
memtable_list_test.cc Removing duplicate code 2015-08-05 07:33:27 -07:00
memtable_list.cc Seperate InternalIterator from Iterator 2015-10-13 15:32:13 -07:00
memtable_list.h Seperate InternalIterator from Iterator 2015-10-13 15:32:13 -07:00
memtable.cc Optimize GetLatestSequenceForKey 2016-01-06 13:43:22 -08:00
memtable.h support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
memtablerep_bench.cc Merge pull request #811 from OverlordQ/unused-variable-warning 2015-11-02 12:44:27 -08:00
merge_context.h API to fetch from both a WriteBatchWithIndex and the db 2015-05-11 14:51:51 -07:00
merge_helper_test.cc Compaction filter on merge operands 2015-10-07 09:30:03 -07:00
merge_helper.cc Seperate InternalIterator from Iterator 2015-10-13 15:32:13 -07:00
merge_helper.h Seperate InternalIterator from Iterator 2015-10-13 15:32:13 -07:00
merge_operator.cc Call merge operators with empty values 2015-06-26 11:35:46 -07:00
merge_test.cc Fix minor bugs in delete operator, snprintf, and size_t usage 2015-12-15 15:26:20 -08:00
options_file_test.cc Fixed build failure of RocksDBLite test on options_file_test.cc 2015-11-10 23:23:36 -08:00
perf_context_test.cc Make perf_context.db_mutex_lock_nanos and db_condition_wait_nanos only measures DB Mutex 2015-10-13 10:41:48 -07:00
plain_table_db_test.cc PlainTableReader to support non-mmap mode 2015-09-23 11:41:07 -07:00
prefix_test.cc Prefix-based iterating only shows keys in prefix 2015-11-05 13:24:05 -08:00
repair.cc Disable Visual Studio Warning C4351 2015-12-28 15:06:34 -08:00
skiplist_test.cc rocksdb: switch to gtest 2015-03-17 14:08:00 -07:00
skiplist.h Switch to thread-local random for skiplist 2015-11-09 19:25:22 -08:00
slice.cc Create an abstract interface for write batches 2015-03-17 19:23:08 -07:00
snapshot_impl.cc Support marking snapshots for write-conflict checking - Take 2 2015-12-08 16:47:31 -08:00
snapshot_impl.h Use SST files for Transaction conflict detection 2015-12-11 12:34:11 -08:00
table_cache.cc Skip bottom-level filter block caching when hit-optimized 2015-12-23 10:15:07 -08:00
table_cache.h Skip bottom-level filter block caching when hit-optimized 2015-12-23 10:15:07 -08:00
table_properties_collector_test.cc Pass column family ID to table property collector 2015-10-09 14:36:51 -07:00
table_properties_collector.cc Support for SingleDelete() 2015-09-17 11:42:56 -07:00
table_properties_collector.h Pass column family ID to table property collector 2015-10-09 14:36:51 -07:00
transaction_log_impl.cc log_reader: pass log_number and optional info_log to ctor 2015-10-18 21:24:32 -04:00
transaction_log_impl.h Move rate_limiter, write buffering, most perf context instrumentation and most random kill out of Env 2015-07-17 16:58:18 -07:00
version_builder_test.cc Add a mode to always pick the oldest file to compact for each level 2015-09-21 17:21:59 -07:00
version_builder.cc Fix minor bugs in delete operator, snprintf, and size_t usage 2015-12-15 15:26:20 -08:00
version_builder.h Log more information for the add file with overlapping range failure 2015-10-19 17:31:13 -07:00
version_edit_test.cc New Manifest format to allow customized fields in NewFile. 2015-10-08 15:51:45 -07:00
version_edit.cc New Manifest format to allow customized fields in NewFile. 2015-10-08 15:51:45 -07:00
version_edit.h Enable MS compiler warning c4244. 2015-12-11 16:47:34 -08:00
version_set_test.cc Fix minor bugs in delete operator, snprintf, and size_t usage 2015-12-15 15:26:20 -08:00
version_set.cc Merge pull request #846 from yuslepukhin/enble_c4244_lossofdata 2015-12-23 22:59:42 -08:00
version_set.h When slowdown is triggered, reduce the write rate 2015-12-23 11:33:15 -08:00
wal_manager_test.cc Fix clang warnings regarding unnecessary std::move 2015-12-24 04:10:00 +08:00
wal_manager.cc Fix clang warnings regarding unnecessary std::move 2015-12-24 04:10:00 +08:00
wal_manager.h Fix -Wnon-virtual-dtor errors 2014-11-10 17:39:38 -05:00
write_batch_base.cc Support for SingleDelete() 2015-09-17 11:42:56 -07:00
write_batch_internal.h support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
write_batch_test.cc support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
write_batch.cc support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00
write_callback_test.cc Fix compile for write_callback_test in ROCKSDB_LITE 2015-07-20 10:54:15 -07:00
write_callback.h Optimistic Transactions 2015-05-29 14:36:35 -07:00
write_controller_test.cc When slowdown is triggered, reduce the write rate 2015-12-23 11:33:15 -08:00
write_controller.cc When slowdown is triggered, reduce the write rate 2015-12-23 11:33:15 -08:00
write_controller.h When slowdown is triggered, reduce the write rate 2015-12-23 11:33:15 -08:00
write_thread.cc use -Werror=missing-field-initializers, to closer match MyRocks build 2015-12-30 14:56:18 -08:00
write_thread.h use -Werror=missing-field-initializers, to closer match MyRocks build 2015-12-30 14:56:18 -08:00
writebuffer.h support for concurrent adds to memtable 2015-12-25 11:03:40 -08:00