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anand76 a6691d0f65 Update stats to help users estimate MultiGet async IO impact (#10182) 
Summary:
Add a couple of stats to help users estimate the impact of potential MultiGet perf improvements -
1. NUM_LEVEL_READ_PER_MULTIGET - A histogram stat for number of levels that required MultiGet to read from a file
2. MULTIGET_COROUTINE_COUNT - A ticker stat to count the number of times the coroutine version of MultiGetFromSST was used

The NUM_DATA_BLOCKS_READ_PER_LEVEL stat is obsoleted as it doesn't provide useful information for MultiGet optimization.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10182

Reviewed By: akankshamahajan15

Differential Revision: D37213296

Pulled By: anand1976

fbshipit-source-id: 5d2b7708017c0e278578ae4bffac3926f6530efb
 		2022-06-16 12:12:43 -07:00
..
file_read_sample.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
histogram.cc Fix overflow bug in standard deviation computation. (#10100) 2022-06-06 13:53:47 -07:00
histogram.h improve-histogram-performance: remove valueIndexMap_ (#8625) 2021-10-14 14:45:20 -07:00
histogram_test.cc Fix overflow bug in standard deviation computation. (#10100) 2022-06-06 13:53:47 -07:00
histogram_windowing.cc Add a SystemClock class to capture the time functions of an Env (#7858) 2021-01-25 22:09:11 -08:00
histogram_windowing.h Add a SystemClock class to capture the time functions of an Env (#7858) 2021-01-25 22:09:11 -08:00
in_memory_stats_history.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
in_memory_stats_history.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
instrumented_mutex.cc Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033) 2021-03-15 04:34:11 -07:00
instrumented_mutex.h Remove explicit padding from CacheAlignedInstrumentedMutex (#9809) 2022-04-05 18:32:05 -07:00
iostats_context.cc Remove ROCKSDB_SUPPORT_THREAD_LOCAL define because it's a part of C++11 (#10015) 2022-05-18 15:25:19 -07:00
iostats_context_imp.h Remove ROCKSDB_SUPPORT_THREAD_LOCAL define because it's a part of C++11 (#10015) 2022-05-18 15:25:19 -07:00
iostats_context_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
perf_context.cc Seek parallelization (#9994) 2022-05-20 16:09:33 -07:00
perf_context_imp.h Remove ROCKSDB_SUPPORT_THREAD_LOCAL define because it's a part of C++11 (#10015) 2022-05-18 15:25:19 -07:00
perf_level.cc Remove ROCKSDB_SUPPORT_THREAD_LOCAL define because it's a part of C++11 (#10015) 2022-05-18 15:25:19 -07:00
perf_level_imp.h Remove ROCKSDB_SUPPORT_THREAD_LOCAL define because it's a part of C++11 (#10015) 2022-05-18 15:25:19 -07:00
perf_step_timer.h make PerfStepTimer struct smaller by reordering members (#7931) 2021-03-08 21:33:15 -08:00
persistent_stats_history.cc Use std::numeric_limits<> (#9954) 2022-05-05 13:08:21 -07:00
persistent_stats_history.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
statistics.cc Update stats to help users estimate MultiGet async IO impact (#10182) 2022-06-16 12:12:43 -07:00
statistics.h Add support for building on s390x platform (#8962) 2021-10-22 10:13:15 -07:00
statistics_test.cc Added a default Name method to Statistics (#8918) 2021-09-17 07:25:43 -07:00
stats_history_test.cc Persist the new MANIFEST after successfully syncing the new WAL during recovery (#9922) 2022-06-01 10:52:26 -07:00
thread_status_impl.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
thread_status_updater.cc Remove ROCKSDB_SUPPORT_THREAD_LOCAL define because it's a part of C++11 (#10015) 2022-05-18 15:25:19 -07:00
thread_status_updater.h Remove ROCKSDB_SUPPORT_THREAD_LOCAL define because it's a part of C++11 (#10015) 2022-05-18 15:25:19 -07:00
thread_status_updater_debug.cc Replace reinterpret_cast with static_cast_with_check (#7067) 2020-07-02 19:25:41 -07:00
thread_status_util.cc Remove ROCKSDB_SUPPORT_THREAD_LOCAL define because it's a part of C++11 (#10015) 2022-05-18 15:25:19 -07:00
thread_status_util.h Remove ROCKSDB_SUPPORT_THREAD_LOCAL define because it's a part of C++11 (#10015) 2022-05-18 15:25:19 -07:00
thread_status_util_debug.cc Add a SystemClock class to capture the time functions of an Env (#7858) 2021-01-25 22:09:11 -08:00