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2 Commits

Author SHA1 Message Date
Andrew Kryczka a720401877 Avoid acquiring SyncPoint mutex when it is disabled (#3991) 
Summary:
In `db_stress` profile the vast majority of CPU time is spent acquiring the `SyncPoint` mutex. I mistakenly assumed #3939 had fixed this mutex contention problem by disabling `SyncPoint` processing. But actually the lock was still being acquired just to check whether processing is enabled. We can avoid that overhead by using an atomic to track whether it's enabled.
Closes https://github.com/facebook/rocksdb/pull/3991

Differential Revision: D8393825

Pulled By: ajkr

fbshipit-source-id: 5bc4e3c722ee7304e7a9c2439998c456b05a6897
 2018-06-13 13:13:18 -07:00
Dmitri Smirnov 53d66df0c4 Refactor sync_point to make implementation either customizable or replaceable 
Summary: Closes https://github.com/facebook/rocksdb/pull/3637

Differential Revision: D7354373

Pulled By: ajkr

fbshipit-source-id: 6816c7bbc192ed0fb944942b11c7074bf24eddf1
 2018-03-23 12:56:52 -07:00