mirror of https://github.com/facebook/rocksdb.git
3dff28cf9b
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 |
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| .. | ||
| aligned_buffer.h | ||
| autovector.h | ||
| autovector_test.cc | ||
| bloom_impl.h | ||
| bloom_test.cc | ||
| build_version.cc.in | ||
| cast_util.h | ||
| channel.h | ||
| coding.cc | ||
| coding.h | ||
| coding_lean.h | ||
| coding_test.cc | ||
| compaction_job_stats_impl.cc | ||
| comparator.cc | ||
| compression.h | ||
| compression_context_cache.cc | ||
| compression_context_cache.h | ||
| concurrent_task_limiter_impl.cc | ||
| concurrent_task_limiter_impl.h | ||
| core_local.h | ||
| crc32c.cc | ||
| crc32c.h | ||
| crc32c_arm64.cc | ||
| crc32c_arm64.h | ||
| crc32c_ppc.c | ||
| crc32c_ppc.h | ||
| crc32c_ppc_asm.S | ||
| crc32c_ppc_constants.h | ||
| crc32c_test.cc | ||
| defer.h | ||
| defer_test.cc | ||
| duplicate_detector.h | ||
| dynamic_bloom.cc | ||
| dynamic_bloom.h | ||
| dynamic_bloom_test.cc | ||
| fastrange.h | ||
| file_checksum_helper.cc | ||
| file_checksum_helper.h | ||
| file_reader_writer_test.cc | ||
| filelock_test.cc | ||
| filter_bench.cc | ||
| gflags_compat.h | ||
| hash.cc | ||
| hash.h | ||
| hash_map.h | ||
| hash_test.cc | ||
| heap.h | ||
| heap_test.cc | ||
| kv_map.h | ||
| log_write_bench.cc | ||
| math.h | ||
| math128.h | ||
| murmurhash.cc | ||
| murmurhash.h | ||
| mutexlock.h | ||
| ppc-opcode.h | ||
| random.cc | ||
| random.h | ||
| random_test.cc | ||
| rate_limiter.cc | ||
| rate_limiter.h | ||
| rate_limiter_test.cc | ||
| repeatable_thread.h | ||
| repeatable_thread_test.cc | ||
| ribbon_alg.h | ||
| ribbon_config.cc | ||
| ribbon_config.h | ||
| ribbon_impl.h | ||
| ribbon_test.cc | ||
| set_comparator.h | ||
| slice.cc | ||
| slice_test.cc | ||
| slice_transform_test.cc | ||
| status.cc | ||
| stderr_logger.h | ||
| stop_watch.h | ||
| string_util.cc | ||
| string_util.h | ||
| thread_list_test.cc | ||
| thread_local.cc | ||
| thread_local.h | ||
| thread_local_test.cc | ||
| thread_operation.h | ||
| threadpool_imp.cc | ||
| threadpool_imp.h | ||
| timer.h | ||
| timer_queue.h | ||
| timer_queue_test.cc | ||
| timer_test.cc | ||
| user_comparator_wrapper.h | ||
| vector_iterator.h | ||
| work_queue.h | ||
| work_queue_test.cc | ||
| xxh3p.h | ||
| xxhash.cc | ||
| xxhash.h | ||