8df334342e
Summary: Currently, `benchmark.sh` computes write amplification itself; the patch changes the script to use the value calculated by RocksDB (which is printed as part of the periodic statistics). This also has the benefit of being correct for BlobDB as well, since it also considers the amount of data written to blob files. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8915 Test Plan: ``` DB_DIR=/tmp/rocksdbtest/dbbench/ WAL_DIR=/tmp/rocksdbtest/dbbench/ NUM_KEYS=20000000 NUM_THREADS=32 tools/benchmark.sh overwrite --enable_blob_files=1 --enable_blob_garbage_collection=1 ... ** Compaction Stats [default] ** Level Files Size Score Read(GB) Rn(GB) Rnp1(GB) Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) Comp(sec) CompMergeCPU(sec) Comp(cnt) Avg(sec) KeyIn KeyDrop Rblob(GB) Wblob(GB) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ L0 7/5 43.93 MB 0.5 0.3 0.0 0.3 0.5 0.3 0.0 1.0 1.3 59.9 201.35 101.88 109 1.847 22M 499K 0.0 11.2 L4 4/4 244.03 MB 0.0 11.4 0.3 1.6 1.6 0.0 0.0 1.1 50.6 49.3 231.10 288.84 7 33.014 156M 26M 9.5 9.5 L5 36/0 3.28 GB 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.00 0.00 0 0.000 0 0 0.0 0.0 Sum 47/9 3.56 GB 0.0 11.7 0.3 1.8 2.2 0.3 0.0 2.0 27.6 54.3 432.45 390.72 116 3.728 179M 26M 9.5 20.8 Int 0/0 0.00 KB 0.0 3.5 0.1 0.5 0.6 0.1 0.0 2.2 31.2 55.6 115.01 109.53 29 3.966 51M 7353K 2.9 5.6 ... Completed overwrite (ID: ) in 289 seconds ops/sec mb/sec Size-GB L0_GB Sum_GB W-Amp W-MB/s usec/op p50 p75 p99 p99.9 p99.99 Uptime Stall-time Stall% Test Date Version Job-ID 111784 44.8 0.0 0.5 2.2 2.0 9.2 285.9 215.3 264.4 1232 13299 23310 243 00:00:0.000 0.0 overwrite.t32.s0 2021-09-14T11:58:26.000-07:00 6.24 ``` Reviewed By: zhichao-cao Differential Revision: D30940352 Pulled By: ltamasi fbshipit-source-id: ae7f5cd5440c8529788dda043266121fc2be0853
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.
Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/ and https://rocksdb.slack.com/
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.