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sdong c7742452eb Add Statistics.getHistogramString() to print more detailed outputs of a histogram 
Summary:
Provide a way for users to know more detailed ditribution of a histogram metrics. Example outputs:

Manually add statement
  fprintf(stdout, "%s\n", dbstats->getHistogramString(SST_READ_MICROS).c_str());
Will print out something like:

Count: 989151  Average: 1.7659  StdDev: 1.52
Min: 0.0000  Median: 1.2071  Max: 860.0000
Percentiles: P50: 1.21 P75: 1.70 P99: 5.12 P99.9: 13.67 P99.99: 21.70
------------------------------------------------------
[       0,       1 )   390839  39.513%  39.513% ########
[       1,       2 )   500918  50.641%  90.154% ##########
[       2,       3 )    79358   8.023%  98.177% ##
[       3,       4 )     6297   0.637%  98.813%
[       4,       5 )     1712   0.173%  98.986%
[       5,       6 )     1134   0.115%  99.101%
[       6,       7 )     1222   0.124%  99.224%
[       7,       8 )     1529   0.155%  99.379%
[       8,       9 )     1264   0.128%  99.507%
[       9,      10 )      988   0.100%  99.607%
[      10,      12 )     1378   0.139%  99.746%
[      12,      14 )     1828   0.185%  99.931%
[      14,      16 )      410   0.041%  99.972%
[      16,      18 )       72   0.007%  99.980%
[      18,      20 )       67   0.007%  99.986%
[      20,      25 )      106   0.011%  99.997%
[      25,      30 )       24   0.002%  99.999%
[      30,      35 )        1   0.000% 100.000%
[     250,     300 )        2   0.000% 100.000%
[     300,     350 )        1   0.000% 100.000%
[     800,     900 )        1   0.000% 100.000%

Test Plan: Manually add a print in db_bench and make sure it prints out as expected. Will add some codes to cover the function

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D43611
2015-08-05 20:05:56 -07:00
..
allocator.h Enforce write buffer memory limit across column families 2014-12-02 12:09:20 -08:00
arena_test.cc rocksdb: switch to gtest 2015-03-17 14:08:00 -07:00
arena.cc Commit both PR and internal code review changes 2015-07-07 16:58:20 -07:00
arena.h Removing unnecessary kInlineSize 2015-03-12 21:13:53 +03:00
auto_roll_logger_test.cc Fix when output level is 0 of universal compaction with trivial move 2015-07-27 14:25:57 -07:00
auto_roll_logger.cc Fix WinEnv::NowMicrosec 2015-07-22 14:36:43 -07:00
auto_roll_logger.h Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
autovector_test.cc Make autovector_test runnable in ROCKSDB_LITE 2015-06-18 15:58:00 -07:00
autovector.h "make format" against last 10 commits 2015-07-13 13:50:18 -07:00
bloom_test.cc rocksdb: switch to gtest 2015-03-17 14:08:00 -07:00
bloom.cc fix typos 2015-04-25 18:14:27 +09:00
build_version.h build: do not relink every single binary just for a timestamp 2015-02-19 13:11:10 -08:00
cache_bench.cc Fix -Wshadow for tools 2014-11-07 15:04:30 -08:00
cache_test.cc Fix memory leaks in PinnedUsageTest 2015-06-19 09:43:08 -07:00
cache.cc Add Cache.GetPinnedUsageUsage() 2015-06-18 13:56:31 -07:00
channel.h Multithreaded backup and restore in BackupEngineImpl 2015-07-02 11:35:51 -07:00
coding_test.cc rocksdb: switch to gtest 2015-03-17 14:08:00 -07:00
coding.cc Removing BitStream* functions 2014-08-19 06:48:21 -07:00
coding.h Turn on -Wshorten-64-to-32 and fix all the errors 2014-11-11 16:47:22 -05:00
compaction_job_stats_impl.cc Count number of corrupt keys during compaction 2015-07-28 16:41:40 -07:00
comparator.cc rocksdb: Add missing override 2015-02-26 11:28:41 -08:00
compression.h Fail DB::Open() when the requested compression is not available 2015-06-18 14:55:05 -07:00
crc32c_test.cc rocksdb: switch to gtest 2015-03-17 14:08:00 -07:00
crc32c.cc Print Fast CRC32 support information in DB LOG 2015-07-10 17:59:36 -07:00
crc32c.h Print Fast CRC32 support information in DB LOG 2015-07-10 17:59:36 -07:00
db_info_dumper.cc extend temp str buffer size 2015-07-16 13:56:17 +08:00
db_info_dumper.h Fix iOS compile with -Wshorten-64-to-32 2014-11-13 14:39:30 -05:00
db_test_util.cc Update Tests To Enable Subcompactions 2015-08-04 22:19:07 -07:00
db_test_util.h Add two unit tests for SyncWAL() 2015-08-05 14:27:02 -07:00
delete_scheduler_impl.cc Make DeleteScheduler tests more reliable 2015-08-05 19:16:52 -07:00
delete_scheduler_impl.h Support delete rate limiting 2015-08-04 20:45:27 -07:00
delete_scheduler_test.cc Make DeleteScheduler tests more reliable 2015-08-05 19:16:52 -07:00
dynamic_bloom_test.cc rocksdb: switch to gtest 2015-03-17 14:08:00 -07:00
dynamic_bloom.cc Enforce write buffer memory limit across column families 2014-12-02 12:09:20 -08:00
dynamic_bloom.h Commit both PR and internal code review changes 2015-07-07 16:58:20 -07:00
env_hdfs.cc Improved FileExists API 2015-07-20 17:20:40 -07:00
env_posix.cc [wal changes 3/3] method in DB to sync WAL without blocking writers 2015-08-05 06:06:39 -07:00
env_test.cc Move rate_limiter, write buffering, most perf context instrumentation and most random kill out of Env 2015-07-17 16:58:18 -07:00
env.cc Ensure Windows build w/o port/port.h in public headers 2015-07-16 12:10:16 -07:00
event_logger_test.cc rocksdb: switch to gtest 2015-03-17 14:08:00 -07:00
event_logger.cc Allow EventLogger to directly log from a JSONWriter. 2015-05-21 15:39:30 -07:00
event_logger.h Added JSON manifest dump option to ldb command 2015-07-17 10:07:40 -07:00
file_reader_writer_test.cc RangeSync not to sync last 1MB of the file 2015-07-21 16:22:40 -07:00
file_reader_writer.cc Add two unit tests for SyncWAL() 2015-08-05 14:27:02 -07:00
file_reader_writer.h Add statistic histogram "rocksdb.sst.read.micros" 2015-08-05 13:02:33 -07:00
file_util.cc Move rate_limiter, write buffering, most perf context instrumentation and most random kill out of Env 2015-07-17 16:58:18 -07:00
file_util.h Provide openable snapshots 2014-11-14 11:38:26 -08:00
filelock_test.cc rocksdb: switch to gtest 2015-03-17 14:08:00 -07:00
filter_policy.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
hash_cuckoo_rep.cc "make format" against last 10 commits 2015-07-13 13:50:18 -07:00
hash_cuckoo_rep.h Enforce write buffer memory limit across column families 2014-12-02 12:09:20 -08:00
hash_linklist_rep.cc "make format" against last 10 commits 2015-07-13 13:50:18 -07:00
hash_linklist_rep.h Enforce write buffer memory limit across column families 2014-12-02 12:09:20 -08:00
hash_skiplist_rep.cc rocksdb: Add missing override 2015-02-26 11:28:41 -08:00
hash_skiplist_rep.h Enforce write buffer memory limit across column families 2014-12-02 12:09:20 -08:00
hash.cc Turn on -Wshorten-64-to-32 and fix all the errors 2014-11-11 16:47:22 -05:00
hash.h Introduce GetThreadList API 2014-11-20 10:49:32 -08:00
heap_test.cc Fix compile on Mac 2015-07-16 11:22:21 +02:00
heap.h Replace std::priority_queue in MergingIterator with custom heap, take 2 2015-07-15 03:34:40 -07:00
histogram_test.cc fix typos 2015-04-25 18:14:27 +09:00
histogram.cc fix typos 2015-04-25 18:14:27 +09:00
histogram.h "make format" against last 10 commits 2015-07-13 13:50:18 -07:00
instrumented_mutex.cc Perf Context to report DB mutex waiting time 2015-02-09 17:55:12 -08:00
instrumented_mutex.h Add a counter for collecting the wait time on db mutex. 2015-02-04 21:39:45 -08:00
iostats_context_imp.h Removed two unused macros in iostats_context 2015-06-12 10:45:02 -07:00
iostats_context.cc Ensure Windows build w/o port/port.h in public headers 2015-07-16 12:10:16 -07:00
ldb_cmd_execute_result.h Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
ldb_cmd.cc dump_manifest supports DB with more number of levels 2015-08-03 11:02:09 -07:00
ldb_cmd.h Added JSON manifest dump option to ldb command 2015-07-17 10:07:40 -07:00
ldb_tool.cc Added 'dump_live_files' command to ldb tool. 2014-12-12 17:50:36 -08:00
log_buffer.cc Commit both PR and internal code review changes 2015-07-07 16:58:20 -07:00
log_buffer.h Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
log_write_bench.cc Fix more gflag namespace issues 2014-05-09 08:41:02 -07:00
logging.cc Make the benchmark scripts configurable and add tests 2015-03-30 11:28:25 -07:00
logging.h Make the benchmark scripts configurable and add tests 2015-03-30 11:28:25 -07:00
manual_compaction_test.cc Ensure Windows build w/o port/port.h in public headers 2015-07-16 12:10:16 -07:00
memenv_test.cc Improved FileExists API 2015-07-20 17:20:40 -07:00
memenv.cc Improved FileExists API 2015-07-20 17:20:40 -07:00
mock_env_test.cc Improved FileExists API 2015-07-20 17:20:40 -07:00
mock_env.cc Improved FileExists API 2015-07-20 17:20:40 -07:00
mock_env.h Improved FileExists API 2015-07-20 17:20:40 -07:00
murmurhash.cc Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
murmurhash.h Turn on -Wshorten-64-to-32 and fix all the errors 2014-11-11 16:47:22 -05:00
mutable_cf_options.cc Don't let flushes preempt compactions 2015-07-17 12:02:52 -07:00
mutable_cf_options.h Parallelize L0-L1 Compaction: Restructure Compaction Job 2015-08-03 11:32:14 -07:00
mutexlock.h Add separate Read/WriteUnlock methods in MutexRW. 2014-06-16 15:41:46 -07:00
options_builder.cc Remove the compability check on log2 OS_ANDROID as it's already blocked by ROCKSDB_LITE 2014-12-04 13:56:14 -08:00
options_helper.cc Don't let flushes preempt compactions 2015-07-17 12:02:52 -07:00
options_helper.h Missing header in build on CentOS 2014-11-18 22:21:02 +01:00
options_test.cc Don't let flushes preempt compactions 2015-07-17 12:02:52 -07:00
options.cc Support delete rate limiting 2015-08-04 20:45:27 -07:00
perf_context_imp.h more times in perf_context and iostats_context 2015-06-02 02:07:58 -07:00
perf_context.cc Ensure Windows build w/o port/port.h in public headers 2015-07-16 12:10:16 -07:00
perf_level_imp.h Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
perf_level.cc Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
perf_step_timer.h more times in perf_context and iostats_context 2015-06-02 02:07:58 -07:00
posix_logger.h Commit both PR and internal code review changes 2015-07-07 16:58:20 -07:00
random.h Add appropriate LICENSE and Copyright message. 2013-10-16 17:48:41 -07:00
rate_limiter_test.cc Enable dynamic changing of rate limiter's bytes_per_second 2015-03-18 15:35:55 -07:00
rate_limiter.cc Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
rate_limiter.h Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
scoped_arena_iterator.h Remove path with arena==nullptr from NewInternalIterator 2014-09-04 17:40:41 -07:00
skiplistrep.cc Allow GetApproximateSize() to include mem table size if it is skip list memtable 2015-06-16 18:13:23 -07:00
slice_transform_test.cc rocksdb: switch to gtest 2015-03-17 14:08:00 -07:00
slice.cc "make format" against last 10 commits 2015-07-13 13:50:18 -07:00
sst_dump_test.cc Compression sizes option for sst_dump_tool 2015-07-29 17:42:13 -07:00
sst_dump_tool_imp.h Compression sizes option for sst_dump_tool 2015-07-29 17:42:13 -07:00
sst_dump_tool.cc Merge branch 'master' of github.com:facebook/rocksdb 2015-08-04 10:56:49 -07:00
statistics.cc Add Statistics.getHistogramString() to print more detailed outputs of a histogram 2015-08-05 20:05:56 -07:00
statistics.h Add Statistics.getHistogramString() to print more detailed outputs of a histogram 2015-08-05 20:05:56 -07:00
status.cc Deprecate WriteOptions::timeout_hint_us 2015-07-14 09:35:48 +02:00
stl_wrappers.h Killing Transform Rep 2013-12-03 12:42:15 -08:00
stop_watch.h Change StopWatch interface 2014-07-28 12:22:37 -07:00
string_util.cc Clean up StringSplit 2014-11-21 11:05:28 -05:00
string_util.h Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
sync_point.cc Move rate_limiter, write buffering, most perf context instrumentation and most random kill out of Env 2015-07-17 16:58:18 -07:00
sync_point.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
testharness.cc rocksdb: print status error message when (ASSERT|EXPECT)_OK fails 2015-03-19 17:32:43 -07:00
testharness.h rocksdb: print status error message when (ASSERT|EXPECT)_OK fails 2015-03-19 17:32:43 -07:00
testutil.cc Move rate_limiter, write buffering, most perf context instrumentation and most random kill out of Env 2015-07-17 16:58:18 -07:00
testutil.h Removing duplicate code 2015-08-05 07:33:27 -07:00
thread_list_test.cc rocksdb: switch to gtest 2015-03-17 14:08:00 -07:00
thread_local_test.cc Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
thread_local.cc "make format" against last 10 commits 2015-07-13 13:50:18 -07:00
thread_local.h "make format" against last 10 commits 2015-07-13 13:50:18 -07:00
thread_operation.h Deprecate CompactionFilterV2 2015-07-17 18:59:11 +02:00
thread_status_impl.cc Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
thread_status_updater_debug.cc Allow GetThreadList() to indicate a thread is doing Compaction. 2015-01-13 00:04:08 -08:00
thread_status_updater.cc Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
thread_status_updater.h Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
thread_status_util_debug.cc Fix bad performance in debug mode 2015-04-13 15:58:45 -07:00
thread_status_util.cc Only initialize the ThreadStatusData when necessary. 2015-06-17 11:21:18 -07:00
thread_status_util.h Only initialize the ThreadStatusData when necessary. 2015-06-17 11:21:18 -07:00
vectorrep.cc Windows Port from Microsoft 2015-07-01 16:13:56 -07:00
xfunc.cc Merge the latest changes from github/master 2015-07-02 17:23:41 -07:00
xfunc.h Merge the latest changes from github/master 2015-07-02 17:23:41 -07:00
xxhash.cc Prevent xxhash symbols from polluting global namespace 2015-03-12 12:07:10 -07:00
xxhash.h Prevent xxhash symbols from polluting global namespace 2015-03-12 12:07:10 -07:00