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

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Peter Dillinger 7555243bcf Refactor ShardedCache for more sharing, static polymorphism (#10801) ... Summary: The motivations for this change include * Free up space in ClockHandle so that we can add data for secondary cache handling while still keeping within single cache line (64 byte) size. * This change frees up space by eliminating the need for the `hash` field by making the fixed-size key itself a hash, using a 128-bit bijective (lossless) hash. * Generally more customizability of ShardedCache (such as hashing) without worrying about virtual call overheads * ShardedCache now uses static polymorphism (template) instead of dynamic polymorphism (virtual overrides) for the CacheShard. No obvious performance benefit is seen from the change (as mostly expected; most calls to virtual functions in CacheShard could already be optimized to static calls), but offers more flexibility without incurring the runtime cost of adhering to a common interface (without type parameters or static callbacks). * You'll also notice less `reinterpret_cast`ing and other boilerplate in the Cache implementations, as this can go in ShardedCache. More detail: * Don't have LRUCacheShard maintain `std::shared_ptr<SecondaryCache>` copies (extra refcount) when LRUCache can be in charge of keeping a `shared_ptr`. * Renamed `capacity_mutex_` to `config_mutex_` to better represent the scope of what it guards. * Some preparation for 64-bit hash and indexing in LRUCache, but didn't include the full change because of slight performance regression. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10801 Test Plan: Unit test updates were non-trivial because of major changes to the ClockCacheShard interface in handling of key vs. hash. Performance: Create with `TEST_TMPDIR=/dev/shm ./db_bench -benchmarks=fillrandom -num=30000000 -disable_wal=1 -bloom_bits=16` Test with ``` TEST_TMPDIR=/dev/shm ./db_bench -benchmarks=readrandom[-X1000] -readonly -num=30000000 -bloom_bits=16 -cache_index_and_filter_blocks=1 -cache_size=610000000 -duration 20 -threads=16 ``` Before: `readrandom [AVG 150 runs] : 321147 (± 253) ops/sec` After: `readrandom [AVG 150 runs] : 321530 (± 326) ops/sec` So possibly ~0.1% improvement. And with `-cache_type=hyper_clock_cache`: Before: `readrandom [AVG 30 runs] : 614126 (± 7978) ops/sec` After: `readrandom [AVG 30 runs] : 645349 (± 8087) ops/sec` So roughly 5% improvement! Reviewed By: anand1976 Differential Revision: D40252236 Pulled By: pdillinger fbshipit-source-id: ff8fc70ef569585edc95bcbaaa0386f61355ae5b		2 years ago
..
env_default.cc	Remove using namespace (#9369)	3 years ago
env_win.cc	Support reservation in thread pool (#10278)	2 years ago
env_win.h	Support reservation in thread pool (#10278)	2 years ago
io_win.cc	Fix GetWindowsErrSz nullptr bug (#10282)	3 years ago
io_win.h	Explicitly closing all directory file descriptors (#10049)	3 years ago
port_win.cc	Fix potential ambiguities in/around port/sys_time.h (#10045)	3 years ago
port_win.h	Refactor ShardedCache for more sharing, static polymorphism (#10801)	2 years ago
win_jemalloc.cc	Remove code that only compiles for Visual Studio versions older than 2015 (#10065)	3 years ago
win_logger.cc	Fix potential ambiguities in/around port/sys_time.h (#10045)	3 years ago
win_logger.h	Use SystemClock* instead of std::shared_ptr<SystemClock> in lower level routines (#8033)	4 years ago
win_thread.cc	Fix incorrect order of comments in win_thread.cc (#9033)	3 years ago
win_thread.h	Replace most typedef with using= (#8751)	3 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