Siying Dong da1c64b6e7 Introduce a CPU time counter in perf_context (#4741) ... Summary: Introduce the first CPU timing counter, perf_context.get_cpu_nanos. This opens a door to more CPU counters in the future. Only Posix Env has it implemented using clock_gettime() with CLOCK_THREAD_CPUTIME_ID. How accurate the counter is depends on the platform. Make PerfStepTimer to take an Env as an argument, and sometimes pass it in. The direct reason is to make the unit tests to use SpecialEnv where we can ingest logic there. But in long term, this is a good change. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4741 Differential Revision: D13287798 Pulled By: siying fbshipit-source-id: 090361049d9d5095d1d1a369fe1338d2e2e1c73f		2018-12-20 12:03:44 -08:00
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rocksdb	Introduce a CPU time counter in perf_context (#4741)	2018-12-20 12:03:44 -08:00