Integrate block cache tracing into db_bench (#5459)
Summary: This PR integrates the block cache tracing into db_bench. It adds three command line arguments. -block_cache_trace_file (Block cache trace file path.) type: string default: "" -block_cache_trace_max_trace_file_size_in_bytes (The maximum block cache trace file size in bytes. Block cache accesses will not be logged if the trace file size exceeds this threshold. Default is 64 GB.) type: int64 default: 68719476736 -block_cache_trace_sampling_frequency (Block cache trace sampling frequency, termed s. It uses spatial downsampling and samples accesses to one out of s blocks.) type: int32 default: 1 Pull Request resolved: https://github.com/facebook/rocksdb/pull/5459 Differential Revision: D15832031 Pulled By: HaoyuHuang fbshipit-source-id: 0ecf2f2686557251fe741a2769b21170777efa3d
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