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

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Peter Dillinger ca7ccbe2ea Misc hashing updates / upgrades (#5909) ... Summary: - Updated our included xxhash implementation to version 0.7.2 (== the latest dev version as of 2019-10-09). - Using XXH_NAMESPACE (like other fb projects) to avoid potential name collisions. - Added fastrange64, and unit tests for it and fastrange32. These are faster alternatives to hash % range. - Use preview version of XXH3 instead of MurmurHash64A for NPHash64 -- Had to update cache_test to increase probability of passing for any given hash function. - Use fastrange64 instead of % with uses of NPHash64 -- Had to fix WritePreparedTransactionTest.CommitOfDelayedPrepared to avoid deadlock apparently caused by new hash collision. - Set default seed for NPHash64 because specifying a seed rarely makes sense for it. - Removed unnecessary include xxhash.h in a popular .h file - Rename preview version of XXH3 to XXH3p for clarity and to ease backward compatibility in case final version of XXH3 is integrated. Relying on existing unit tests for NPHash64-related changes. Each new implementation of fastrange64 passed unit tests when manipulating my local build to select it. I haven't done any integration performance tests, but I consider the improved performance of the pieces being swapped in to be well established. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5909 Differential Revision: D18125196 Pulled By: pdillinger fbshipit-source-id: f6bf83d49d20cbb2549926adf454fd035f0ecc0d		5 years ago
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block_cache_tracer.cc	Misc hashing updates / upgrades (#5909)	5 years ago
block_cache_tracer.h	Block cache analyzer: Support reading from human readable trace file. (#5679)	5 years ago
block_cache_tracer_test.cc	Block cache analyzer: Support reading from human readable trace file. (#5679)	5 years ago
trace_replay.cc	Fix the potential memory leak in trace_replay (#5955)	5 years ago
trace_replay.h	Enable trace_replay with multi-threads (#5934)	5 years ago