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Islam AbdelRahman f5177c761f Remove wasteful instrumentation in FullMerge (stacked on D59577) 
Summary:
[ This diff is stacked on top of D59577 ]

We keep calling timer.ElapsedNanos() on every call to MergeOperator::FullMerge even when statistics are disabled, this is wasteful.

I run the readseq benchmark on a DB containing 100K merge operands for 100K keys (1 operand per key) with 1GB block cache
I see slight performance improvment

Original results

```
$ ./db_bench --benchmarks="readseq,readseq,readseq,readseq,readseq,readseq,readseq,readseq,readseq" --merge_operator="max" --merge_keys=100000 --num=100000 --db="/dev/shm/100K_merge_compacted/" --cache_size=1073741824 --use_existing_db --disable_auto_compactions
------------------------------------------------
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.498 micros/op 2006597 ops/sec;  222.0 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.295 micros/op 3393627 ops/sec;  375.4 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.285 micros/op 3511155 ops/sec;  388.4 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.286 micros/op 3500470 ops/sec;  387.2 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.283 micros/op 3530751 ops/sec;  390.6 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.289 micros/op 3464811 ops/sec;  383.3 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.277 micros/op 3612814 ops/sec;  399.7 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.283 micros/op 3539640 ops/sec;  391.6 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.285 micros/op 3503766 ops/sec;  387.6 MB/s
```

After patch

```
$ ./db_bench --benchmarks="readseq,readseq,readseq,readseq,readseq,readseq,readseq,readseq,readseq" --merge_operator="max" --merge_keys=100000 --num=100000 --db="/dev/shm/100K_merge_compacted/" --cache_size=1073741824 --use_existing_db --disable_auto_compactions
------------------------------------------------
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.476 micros/op 2100119 ops/sec;  232.3 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.278 micros/op 3600887 ops/sec;  398.4 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.275 micros/op 3636698 ops/sec;  402.3 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.271 micros/op 3691661 ops/sec;  408.4 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.273 micros/op 3661534 ops/sec;  405.1 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.276 micros/op 3627106 ops/sec;  401.3 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.272 micros/op 3682635 ops/sec;  407.4 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.266 micros/op 3758331 ops/sec;  415.8 MB/s
DB path: [/dev/shm/100K_merge_compacted/]
readseq      :       0.266 micros/op 3761907 ops/sec;  416.2 MB/s
```

Test Plan: make check -j64

Reviewers: yhchiang, sdong

Reviewed By: sdong

Subscribers: andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D59583
2016-06-13 16:22:14 -07:00
..
auto_roll_logger_test.cc Eliminate use of 'using namespace std'. Also remove a number of ADL references to std functions. 2016-05-20 07:42:18 -07:00
auto_roll_logger.cc Eliminate use of 'using namespace std'. Also remove a number of ADL references to std functions. 2016-05-20 07:42:18 -07:00
auto_roll_logger.h Redo SyncPoints for flush while rolling test 2016-02-22 21:32:19 -08:00
builder.cc [rocksdb] make more options dynamic 2016-05-17 13:11:56 -07:00
builder.h [rocksdb] make more options dynamic 2016-05-17 13:11:56 -07:00
c_test.c Shared dictionary compression using reference block 2016-04-27 17:36:03 -07:00
c.cc memtable_prefix_bloom_bits -> memtable_prefix_bloom_bits_ratio and deprecate memtable_prefix_bloom_probes 2016-06-10 12:12:10 -07:00
column_family_test.cc Adding test for contiguous WAL detection 2016-06-07 18:04:15 -07:00
column_family.cc memtable_prefix_bloom_bits -> memtable_prefix_bloom_bits_ratio and deprecate memtable_prefix_bloom_probes 2016-06-10 12:12:10 -07:00
column_family.h Fix calling GetCurrentMutableCFOptions in CompactionJob::ProcessKeyValueCompaction() 2016-04-29 17:00:50 -07:00
compact_files_test.cc Fixed CompactFiles() spuriously failing or corrupting DB 2016-02-22 13:54:58 -08:00
compacted_db_impl.cc CompactedDB should not be used if there is outstanding WAL files 2016-04-26 14:22:07 -07:00
compacted_db_impl.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
compaction_iterator_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
compaction_iterator.cc Fixing snapshot 0 assertion 2016-04-16 01:47:15 -07:00
compaction_iterator.h Fix data race issue when sub-compaction is used in CompactionJob 2016-03-24 19:36:39 -07:00
compaction_job_stats_test.cc Introduce XPRESS compresssion on Windows. (#1081) 2016-04-19 22:54:24 -07:00
compaction_job_test.cc Introduce SstFileManager::SetMaxAllowedSpaceUsage() to cap disk space usage 2016-02-17 15:20:23 -08:00
compaction_job.cc [rocksdb] make more options dynamic 2016-05-17 13:11:56 -07:00
compaction_job.h [rocksdb] make more options dynamic 2016-05-17 13:11:56 -07:00
compaction_picker_test.cc Clean up the ComputeCompactionScore() API 2016-05-23 15:55:29 -07:00
compaction_picker.cc Clean up the ComputeCompactionScore() API 2016-05-23 15:55:29 -07:00
compaction_picker.h [rocksdb] make more options dynamic 2016-05-17 13:11:56 -07:00
compaction.cc [rocksdb] make more options dynamic 2016-05-17 13:11:56 -07:00
compaction.h Merge pull request #1101 from flyd1005/wip-fix-typo 2016-04-28 02:30:44 -07:00
comparator_db_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
convenience.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
corruption_test.cc Change several option defaults 2016-04-28 17:50:58 -07:00
cuckoo_table_db_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
db_block_cache_test.cc add option to not flush memtable on open() 2016-06-13 11:34:16 -07:00
db_bloom_filter_test.cc BlockBasedTable::FullFilterKeyMayMatch() Should skip prefix bloom if full key bloom exists 2016-06-10 16:27:56 -07:00
db_compaction_filter_test.cc Change some RocksDB default options 2016-03-31 17:12:18 -07:00
db_compaction_test.cc Change several option defaults 2016-04-28 17:50:58 -07:00
db_dynamic_level_test.cc Fix flaky DBTestDynamicLevel.DynamicLevelMaxBytesBase2 2016-05-26 10:13:24 -07:00
db_filesnapshot.cc Backup Options 2016-06-09 19:03:10 -07:00
db_impl_debug.cc [rocksdb] make more options dynamic 2016-05-17 13:11:56 -07:00
db_impl_experimental.cc Clean up the ComputeCompactionScore() API 2016-05-23 15:55:29 -07:00
db_impl_readonly.cc Add Iterator Property rocksdb.iterator.version_number 2016-03-02 16:23:59 -08:00
db_impl_readonly.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
db_impl.cc add option to not flush memtable on open() 2016-06-13 11:34:16 -07:00
db_impl.h Backup Options 2016-06-09 19:03:10 -07:00
db_info_dumper.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
db_info_dumper.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
db_inplace_update_test.cc Change some RocksDB default options 2016-03-31 17:12:18 -07:00
db_io_failure_test.cc Move IO failure test to separate file 2016-05-18 17:09:20 -07:00
db_iter_test.cc Add Iterator Property rocksdb.iterator.version_number 2016-03-02 16:23:59 -08:00
db_iter.cc Reuse TimedFullMerge instead of FullMerge + instrumentation 2016-06-13 16:17:26 -07:00
db_iter.h Introduce PinnedIteratorsManager (Reduce PinData() overhead / Refactor PinData) 2016-04-26 12:41:07 -07:00
db_iterator_test.cc Fix win build 2016-05-09 11:52:28 -07:00
db_log_iter_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
db_properties_test.cc Improve BytewiseComparatorImpl::FindShortestSeparator 2016-04-25 23:02:14 -07:00
db_sst_test.cc [rocksdb] make more options dynamic 2016-05-17 13:11:56 -07:00
db_table_properties_test.cc Embed column family name in SST file 2016-04-06 23:10:32 -07:00
db_tailing_iter_test.cc Change Property name from "rocksdb.current_version_number" to "rocksdb.current-super-version-number" 2016-03-04 18:15:29 -08:00
db_test2.cc Fix mutex unlock issue between scheduled compaction and ReleaseCompactionFiles() 2016-05-18 14:56:30 -07:00
db_test_util.cc Change several option defaults 2016-04-28 17:50:58 -07:00
db_test_util.h Fix win build 2016-05-09 11:52:28 -07:00
db_test.cc Backup Options 2016-06-09 19:03:10 -07:00
db_universal_compaction_test.cc Alpine Linux Build (#990) 2016-04-22 16:49:12 -07:00
db_wal_test.cc add option to not flush memtable on open() 2016-06-13 11:34:16 -07:00
dbformat_test.cc Improve BytewiseComparatorImpl::FindShortestSeparator 2016-04-25 23:02:14 -07:00
dbformat.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
dbformat.h Modification of WriteBatch to support two phase commit 2016-05-10 14:06:07 -07:00
deletefile_test.cc Handle concurrent manifest update and backup creation 2016-02-29 12:56:55 -08:00
event_helpers.cc Added EventListener::OnTableFileCreationStarted() callback 2016-04-29 11:35:00 -07:00
event_helpers.h Added EventListener::OnTableFileCreationStarted() callback 2016-04-29 11:35:00 -07:00
experimental.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
fault_injection_test.cc [rocksdb] Recovery path sequence miscount fix 2016-05-10 14:06:07 -07:00
file_indexer_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
file_indexer.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
file_indexer.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
filename_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
filename.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
filename.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
flush_job_test.cc Rename options.compaction_measure_io_stats to options.report_bg_io_stats and include flush too. 2016-04-15 10:22:18 -07:00
flush_job.cc Small tweaks to logging to track the number of immutable memtables 2016-06-01 11:11:33 -07:00
flush_job.h Rename options.compaction_measure_io_stats to options.report_bg_io_stats and include flush too. 2016-04-15 10:22:18 -07:00
flush_scheduler.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
flush_scheduler.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
forward_iterator_bench.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
forward_iterator.cc Change Property name from "rocksdb.current_version_number" to "rocksdb.current-super-version-number" 2016-03-04 18:15:29 -08:00
forward_iterator.h Add Iterator Property rocksdb.iterator.version_number 2016-03-02 16:23:59 -08:00
inlineskiplist_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
inlineskiplist.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
internal_stats.cc Shouldn't report default column family's compaction stats as DB compaction stats 2016-04-25 13:56:59 -07:00
internal_stats.h Shouldn't report default column family's compaction stats as DB compaction stats 2016-04-25 13:56:59 -07:00
job_context.h Cleanup stale manifests outside of full purge 2016-03-10 18:16:21 -08:00
listener_test.cc Add a callback for when memtable is moved to immutable (#1137) 2016-06-02 11:57:31 -07:00
log_format.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
log_reader.cc db/log_reader: combine kBadRecord{Len,Checksum} for readability 2016-05-22 22:00:15 -07:00
log_reader.h db/log_reader: treat bad record length or checksum as EOF 2016-05-22 22:00:15 -07:00
log_test.cc db/log_reader: treat bad record length or checksum as EOF 2016-05-22 22:00:15 -07:00
log_writer.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
log_writer.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
managed_iterator.cc Fixes warnings and ensure correct int behavior on 32-bit platforms. 2016-03-16 22:57:57 +01:00
managed_iterator.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
manual_compaction_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
memtable_allocator.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
memtable_allocator.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
memtable_list_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
memtable_list.cc [rocksdb] Memtable Log Referencing and Prepared Batch Recovery 2016-05-10 14:06:07 -07:00
memtable_list.h [rocksdb] Memtable Log Referencing and Prepared Batch Recovery 2016-05-10 14:06:07 -07:00
memtable.cc Reuse TimedFullMerge instead of FullMerge + instrumentation 2016-06-13 16:17:26 -07:00
memtable.h memtable_prefix_bloom_bits -> memtable_prefix_bloom_bits_ratio and deprecate memtable_prefix_bloom_probes 2016-06-10 12:12:10 -07:00
memtablerep_bench.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
merge_context.h Eliminate std::deque initialization while iterating over merge operands 2016-04-01 15:48:55 -07:00
merge_helper_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
merge_helper.cc Remove wasteful instrumentation in FullMerge (stacked on D59577) 2016-06-13 16:22:14 -07:00
merge_helper.h Reuse TimedFullMerge instead of FullMerge + instrumentation 2016-06-13 16:17:26 -07:00
merge_operator.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
merge_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
options_file_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
perf_context_test.cc CompactedDB should not be used if there is outstanding WAL files 2016-04-26 14:22:07 -07:00
pinned_iterators_manager.h Introduce PinnedIteratorsManager (Reduce PinData() overhead / Refactor PinData) 2016-04-26 12:41:07 -07:00
plain_table_db_test.cc Embed column family name in SST file 2016-04-06 23:10:32 -07:00
prefix_test.cc memtable_prefix_bloom_bits -> memtable_prefix_bloom_bits_ratio and deprecate memtable_prefix_bloom_probes 2016-06-10 12:12:10 -07:00
repair_test.cc Add unit tests for RepairDB 2016-03-18 15:18:42 -07:00
repair.cc [rocksdb] make more options dynamic 2016-05-17 13:11:56 -07:00
skiplist_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
skiplist.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
snapshot_impl.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
snapshot_impl.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
table_cache.cc Enable configurable readahead for iterators 2016-05-04 15:25:58 -07:00
table_cache.h Enable configurable readahead for iterators 2016-05-04 15:25:58 -07:00
table_properties_collector_test.cc Added "number of merge operands" to statistics in ssts. 2016-05-19 14:24:48 -07:00
table_properties_collector.cc Added "number of merge operands" to statistics in ssts. 2016-05-19 14:24:48 -07:00
table_properties_collector.h Added "number of merge operands" to statistics in ssts. 2016-05-19 14:24:48 -07:00
transaction_log_impl.cc Eliminate use of 'using namespace std'. Also remove a number of ADL references to std functions. 2016-05-20 07:42:18 -07:00
transaction_log_impl.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
version_builder_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
version_builder.cc Adding pin_l0_filter_and_index_blocks_in_cache feature and related fixes. 2016-04-01 10:42:39 -07:00
version_builder.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
version_edit_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
version_edit.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
version_edit.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
version_set_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
version_set.cc Reuse TimedFullMerge instead of FullMerge + instrumentation 2016-06-13 16:17:26 -07:00
version_set.h memtable_prefix_bloom_bits -> memtable_prefix_bloom_bits_ratio and deprecate memtable_prefix_bloom_probes 2016-06-10 12:12:10 -07:00
wal_manager_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
wal_manager.cc In all the places where log records are read, there was a check that 2016-03-30 23:05:22 +05:30
wal_manager.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
write_batch_base.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
write_batch_internal.h [rocksdb] Recovery path sequence miscount fix 2016-05-10 14:06:07 -07:00
write_batch_test.cc Modification of WriteBatch to support two phase commit 2016-05-10 14:06:07 -07:00
write_batch.cc Reuse TimedFullMerge instead of FullMerge + instrumentation 2016-06-13 16:17:26 -07:00
write_callback_test.cc write_callback_test: clean test directory before running tests 2016-04-18 10:18:41 -07:00
write_callback.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
write_controller_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
write_controller.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
write_controller.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
write_thread.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
write_thread.h [rocksdb] Memtable Log Referencing and Prepared Batch Recovery 2016-05-10 14:06:07 -07:00
writebuffer.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
xfunc_test_points.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
xfunc_test_points.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00