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rocksdb/utilities
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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
..
backupable backupable_db.cc: lambada to explictly caputre "this" when escaping scope 2016-05-20 10:16:49 -07:00
checkpoint Forge current file for checkpoint 2016-03-17 10:07:21 -07:00
compaction_filters Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
convenience Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
document Alpine Linux Build (#990) 2016-04-22 16:49:12 -07:00
flashcache Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
geodb Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
leveldb_options Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
memory Temporarily disable unstable tests in memory_test.cc 2016-02-09 16:28:34 -08:00
merge_operators Add MaxOperator to utilities/merge_operators/ 2016-05-19 15:51:29 -07:00
options Relax the check condition of prefix_extractor in CheckOptionsCompatibility 2016-02-19 14:42:24 -08:00
persistent_cache Disable lite build/testing for persistent read cache 2016-05-22 21:39:17 -07:00
redis Eliminate use of 'using namespace std'. Also remove a number of ADL references to std functions. 2016-05-20 07:42:18 -07:00
simulator_cache add simulator Cache as class SimCache/SimLRUCache(with test) 2016-05-23 23:35:23 -07:00
spatialdb fix wrong assignment of level0_stop_writes_trigger in spatialdb (#1061) 2016-04-07 09:02:28 -07:00
table_properties_collectors Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
transactions Fix build 2016-05-18 00:41:14 -07:00
ttl Skip unsupported tests in ROCKSDB_LITE 2015-07-20 11:24:54 -07:00
write_batch_with_index Modification of WriteBatch to support two phase commit 2016-05-10 14:06:07 -07:00
env_mirror_test.cc env: add EnvMirror 2015-12-10 21:32:45 -05:00
env_mirror.cc Fix warning in release 2015-12-23 22:38:12 -08:00
merge_operators.h Add MaxOperator to utilities/merge_operators/ 2016-05-19 15:51:29 -07:00
util_merge_operators_test.cc Add MaxOperator to utilities/merge_operators/ 2016-05-19 15:51:29 -07:00