d583d23d86
Summary: When --benchmarks has more than one test then the threads in one benchmark will use the same set of seeds as the threads in the previous benchmark. This diff fixe that. This fixes https://github.com/facebook/rocksdb/issues/9632 Pull Request resolved: https://github.com/facebook/rocksdb/pull/9733 Test Plan: For this command line the block cache is 8GB, so it caches at most 1024 8KB blocks. Note that without this diff the second run of readrandom has a much better response time because seed reuse means the second run reads the same 1000 blocks as the first run and they are cached at that point. But with this diff that does not happen. ./db_bench --benchmarks=fillseq,flush,compact0,waitforcompaction,levelstats,readrandom,readrandom --compression_type=zlib --num=10000000 --reads=1000 --block_size=8192 ... ``` Level Files Size(MB) -------------------- 0 0 0 1 11 238 2 9 253 3 0 0 4 0 0 5 0 0 6 0 0 ``` --- perf results without this diff DB path: [/tmp/rocksdbtest-2260/dbbench] readrandom : 46.212 micros/op 21618 ops/sec; 2.4 MB/s (1000 of 1000 found) DB path: [/tmp/rocksdbtest-2260/dbbench] readrandom : 21.963 micros/op 45450 ops/sec; 5.0 MB/s (1000 of 1000 found) --- perf results with this diff DB path: [/tmp/rocksdbtest-2260/dbbench] readrandom : 47.213 micros/op 21126 ops/sec; 2.3 MB/s (1000 of 1000 found) DB path: [/tmp/rocksdbtest-2260/dbbench] readrandom : 42.880 micros/op 23299 ops/sec; 2.6 MB/s (1000 of 1000 found) Reviewed By: jay-zhuang Differential Revision: D35089763 Pulled By: mdcallag fbshipit-source-id: 1b50143a07afe876b8c8e5fa50dd94a8ce57fc6b |
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| LANGUAGE-BINDINGS.md | ||
| LICENSE.Apache | ||
| LICENSE.leveldb | ||
| Makefile | ||
| PLUGINS.md | ||
| README.md | ||
| ROCKSDB_LITE.md | ||
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README.md
RocksDB: A Persistent Key-Value Store for Flash and RAM Storage
RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
This code is a library that forms the core building block for a fast key-value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it especially suitable for storing multiple terabytes of data in a single database.
Start with example usage here: https://github.com/facebook/rocksdb/tree/main/examples
See the github wiki for more explanation.
The public interface is in include/. Callers should not include or
rely on the details of any other header files in this package. Those
internal APIs may be changed without warning.
Questions and discussions are welcome on the RocksDB Developers Public Facebook group and email list on Google Groups.
License
RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.