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5d660258e7
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Aaron Gao 5d660258e7 add simulator Cache as class SimCache/SimLRUCache(with test) 
Summary: add class SimCache(base class with instrumentation api) and SimLRUCache(derived class with detailed implementation) which is used as an instrumented block cache that can predict hit rate for different cache size

Test Plan:
Add a test case in `db_block_cache_test.cc` called `SimCacheTest` to test basic logic of SimCache.
Also add option `-simcache_size` in db_bench. if set with a value other than -1, then the benchmark will use this value as the size of the simulator cache and finally output the simulation result.
```
[gzh@dev9927.prn1 ~/local/rocksdb] ./db_bench -benchmarks "fillseq,readrandom" -cache_size 1000000 -simcache_size 1000000
RocksDB:    version 4.8
Date:       Tue May 17 16:56:16 2016
CPU:        32 * Intel(R) Xeon(R) CPU E5-2660 0 @ 2.20GHz
CPUCache:   20480 KB
Keys:       16 bytes each
Values:     100 bytes each (50 bytes after compression)
Entries:    1000000
Prefix:    0 bytes
Keys per prefix:    0
RawSize:    110.6 MB (estimated)
FileSize:   62.9 MB (estimated)
Write rate: 0 bytes/second
Compression: Snappy
Memtablerep: skip_list
Perf Level: 0
WARNING: Assertions are enabled; benchmarks unnecessarily slow
------------------------------------------------
DB path: [/tmp/rocksdbtest-112628/dbbench]
fillseq      :       6.809 micros/op 146874 ops/sec;   16.2 MB/s
DB path: [/tmp/rocksdbtest-112628/dbbench]
readrandom   :       6.343 micros/op 157665 ops/sec;   17.4 MB/s (1000000 of 1000000 found)

SIMULATOR CACHE STATISTICS:
SimCache LOOKUPs: 986559
SimCache HITs:    264760
SimCache HITRATE: 26.84%

[gzh@dev9927.prn1 ~/local/rocksdb] ./db_bench -benchmarks "fillseq,readrandom" -cache_size 1000000 -simcache_size 10000000
RocksDB:    version 4.8
Date:       Tue May 17 16:57:10 2016
CPU:        32 * Intel(R) Xeon(R) CPU E5-2660 0 @ 2.20GHz
CPUCache:   20480 KB
Keys:       16 bytes each
Values:     100 bytes each (50 bytes after compression)
Entries:    1000000
Prefix:    0 bytes
Keys per prefix:    0
RawSize:    110.6 MB (estimated)
FileSize:   62.9 MB (estimated)
Write rate: 0 bytes/second
Compression: Snappy
Memtablerep: skip_list
Perf Level: 0
WARNING: Assertions are enabled; benchmarks unnecessarily slow
------------------------------------------------
DB path: [/tmp/rocksdbtest-112628/dbbench]
fillseq      :       5.066 micros/op 197394 ops/sec;   21.8 MB/s
DB path: [/tmp/rocksdbtest-112628/dbbench]
readrandom   :       6.457 micros/op 154870 ops/sec;   17.1 MB/s (1000000 of 1000000 found)

SIMULATOR CACHE STATISTICS:
SimCache LOOKUPs: 1059764
SimCache HITs:    374501
SimCache HITRATE: 35.34%

[gzh@dev9927.prn1 ~/local/rocksdb] ./db_bench -benchmarks "fillseq,readrandom" -cache_size 1000000 -simcache_size 100000000
RocksDB:    version 4.8
Date:       Tue May 17 16:57:32 2016
CPU:        32 * Intel(R) Xeon(R) CPU E5-2660 0 @ 2.20GHz
CPUCache:   20480 KB
Keys:       16 bytes each
Values:     100 bytes each (50 bytes after compression)
Entries:    1000000
Prefix:    0 bytes
Keys per prefix:    0
RawSize:    110.6 MB (estimated)
FileSize:   62.9 MB (estimated)
Write rate: 0 bytes/second
Compression: Snappy
Memtablerep: skip_list
Perf Level: 0
WARNING: Assertions are enabled; benchmarks unnecessarily slow
------------------------------------------------
DB path: [/tmp/rocksdbtest-112628/dbbench]
fillseq      :       5.632 micros/op 177572 ops/sec;   19.6 MB/s
DB path: [/tmp/rocksdbtest-112628/dbbench]
readrandom   :       6.892 micros/op 145094 ops/sec;   16.1 MB/s (1000000 of 1000000 found)

SIMULATOR CACHE STATISTICS:
SimCache LOOKUPs: 1150767
SimCache HITs:    1034535
SimCache HITRATE: 89.90%
```

Reviewers: IslamAbdelRahman, andrewkr, sdong

Reviewed By: sdong

Subscribers: MarkCallaghan, andrewkr, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D57999
2016-05-23 23:35:23 -07:00
..
dump Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
rdb fix typos in comments 2015-12-11 01:54:48 +09:00
auto_sanity_test.sh fix typos in comments 2015-12-11 01:54:48 +09:00
benchmark_leveldb.sh Add scripts to run leveldb benchmark 2015-04-27 19:32:56 -07:00
benchmark.sh Initial script for the new regression test 2016-05-09 13:32:57 -07:00
check_format_compatible.sh tools/check_format_compatible.sh to use consistent version when testing backward and forward compatibility 2016-03-21 11:13:26 -07:00
db_bench_tool.cc add simulator Cache as class SimCache/SimLRUCache(with test) 2016-05-23 23:35:23 -07:00
db_bench.cc Initial script for the new regression test 2016-05-09 13:32:57 -07:00
db_crashtest.py [db_stress] Make subcompaction random in crash_test 2016-04-18 14:43:33 -07:00
db_repl_stress.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
db_sanity_test.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
db_stress.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
dbench_monitor Added simple monitoring script to monitor overusage of memory in db_bench 2015-02-11 18:40:11 -08:00
Dockerfile adding docker build script and dockerfile 2015-05-22 16:03:39 -07:00
generate_random_db.sh Script to check whether RocksDB can read DB generated by previous releases and vice versa 2015-04-08 16:04:59 -07:00
ldb_cmd_impl.h [ldb] Export ldb_cmd*.h 2016-05-06 16:09:09 -07:00
ldb_cmd_test.cc [ldb] Export ldb_cmd*.h 2016-05-06 16:09:09 -07:00
ldb_cmd.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
ldb_test.py ldb to support --column_family option 2016-01-25 14:58:18 -08:00
ldb_tool.cc [ldb] Export LDBCommandRunner 2016-05-11 13:08:45 -07:00
ldb.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
pflag Added simple monitoring script to monitor overusage of memory in db_bench 2015-02-11 18:40:11 -08:00
reduce_levels_test.cc [ldb] Templatize the Selector 2016-05-13 12:12:39 -07:00
regression_test.sh Initial script for the new regression test 2016-05-09 13:32:57 -07:00
rocksdb_dump_test.sh Update dump_tool and undump_tool to accept Options 2015-10-05 19:49:48 -07:00
run_flash_bench.sh Update benchmarks used to measure subcompaction performance 2016-03-04 12:32:11 -08:00
run_leveldb.sh Add scripts to run leveldb benchmark 2015-04-27 19:32:56 -07:00
sample-dump.dmp First version of rocksdb_dump and rocksdb_undump. 2015-06-19 16:24:36 -07:00
sst_dump_test.cc Shared dictionary compression using reference block 2016-04-27 17:36:03 -07:00
sst_dump_tool_imp.h Adding pin_l0_filter_and_index_blocks_in_cache feature and related fixes. 2016-04-01 10:42:39 -07:00
sst_dump_tool.cc Added "number of merge operands" to statistics in ssts. 2016-05-19 14:24:48 -07:00
sst_dump.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
verify_random_db.sh Script to check whether RocksDB can read DB generated by previous releases and vice versa 2015-04-08 16:04:59 -07:00
write_stress_runner.py Write stress test 2015-10-28 16:15:07 -07:00
write_stress.cc Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00