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

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mrambacher 3dff28cf9b Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033) ... Summary: For performance purposes, the lower level routines were changed to use a SystemClock* instead of a std::shared_ptr<SystemClock>. The shared ptr has some performance degradation on certain hardware classes. For most of the system, there is no risk of the pointer being deleted/invalid because the shared_ptr will be stored elsewhere. For example, the ImmutableDBOptions stores the Env which has a std::shared_ptr<SystemClock> in it. The SystemClock* within the ImmutableDBOptions is essentially a "short cut" to gain access to this constant resource. There were a few classes (PeriodicWorkScheduler?) where the "short cut" property did not hold. In those cases, the shared pointer was preserved. Using db_bench readrandom perf_level=3 on my EC2 box, this change performed as well or better than 6.17: 6.17: readrandom : 28.046 micros/op 854902 ops/sec; 61.3 MB/s (355999 of 355999 found) 6.18: readrandom : 32.615 micros/op 735306 ops/sec; 52.7 MB/s (290999 of 290999 found) PR: readrandom : 27.500 micros/op 871909 ops/sec; 62.5 MB/s (367999 of 367999 found) (Note that the times for 6.18 are prior to revert of the SystemClock). Pull Request resolved: https://github.com/facebook/rocksdb/pull/8033 Reviewed By: pdillinger Differential Revision: D27014563 Pulled By: mrambacher fbshipit-source-id: ad0459eba03182e454391b5926bf5cdd45657b67		4 years ago
..
env_default.cc	Create a CustomEnv class; Add WinFileSystem; Make LegacyFileSystemWrapper private (#7703)	4 years ago
env_win.cc	Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033)	4 years ago
env_win.h	Add a SystemClock class to capture the time functions of an Env (#7858)	4 years ago
io_win.cc	Create a CustomEnv class; Add WinFileSystem; Make LegacyFileSystemWrapper private (#7703)	4 years ago
io_win.h	Create a CustomEnv class; Add WinFileSystem; Make LegacyFileSystemWrapper private (#7703)	4 years ago
port_win.cc	Fix MSVC-related build issues (#7439)	4 years ago
port_win.h	Improvements to Env::GetChildren (#7819)	4 years ago
win_jemalloc.cc	build: make it compile with @mode/win (#7406)	4 years ago
win_logger.cc	Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033)	4 years ago
win_logger.h	Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033)	4 years ago
win_thread.cc	build: make it compile with @mode/win (#7406)	4 years ago
win_thread.h	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
xpress_win.cc	Introduce a helper method UncompressData (#7434)	4 years ago
xpress_win.h	Introduce a helper method UncompressData (#7434)	4 years ago