fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Gabriel Wicke 090c78a0d7 Support lowering CPU priority of background threads ... Summary: Background activities like compaction can negatively affect latency of higher-priority tasks like request processing. To avoid this, rocksdb already lowers the IO priority of background threads on Linux systems. While this takes care of typical IO-bound systems, it does not help much when CPU (temporarily) becomes the bottleneck. This is especially likely when using more expensive compression settings. This patch adds an API to allow for lowering the CPU priority of background threads, modeled on the IO priority API. Benchmarks (see below) show significant latency and throughput improvements when CPU bound. As a result, workloads with some CPU usage bursts should benefit from lower latencies at a given utilization, or should be able to push utilization higher at a given request latency target. A useful side effect is that compaction CPU usage is now easily visible in common tools, allowing for an easier estimation of the contribution of compaction vs. request processing threads. As with IO priority, the implementation is limited to Linux, degrading to a no-op on other systems. Closes https://github.com/facebook/rocksdb/pull/3763 Differential Revision: D7740096 Pulled By: gwicke fbshipit-source-id: e5d32373e8dc403a7b0c2227023f9ce4f22b413c		6 years ago
..
env.cc	include thread-pool priority in thread names	6 years ago
env_basic_test.cc	Move some files under util/ to separate dirs	8 years ago
env_chroot.cc	Change RocksDB License	7 years ago
env_chroot.h	Change RocksDB License	7 years ago
env_encryption.cc	Fix some typos in comments and docs.	7 years ago
env_hdfs.cc	Disallow compactions if there isn't enough free space	7 years ago
env_posix.cc	Support lowering CPU priority of background threads	6 years ago
env_test.cc	Disable EnvPosixTest::FilePermission	6 years ago
io_posix.cc	fix memory leak in two_level_iterator	6 years ago
io_posix.h	Comment out unused variables	7 years ago
mock_env.cc	comment unused parameters to turn on -Wunused-parameter flag	6 years ago
mock_env.h	Change RocksDB License	7 years ago
mock_env_test.cc	Move some files under util/ to separate dirs	8 years ago
posix_logger.h	Disallow compactions if there isn't enough free space	7 years ago