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121eb32679
Instructions retired per op is a much more stable than time per op (inverse throughput) since it isn't much affected by changes in CPU frequencey or other load on the test system (it's still somewhat affected since a slower system will run more reactor polls per op). It's also less indicative of real performance, since it's possible for fewer inststructions to execute in more time than more instructions, but that isn't an issue for comparative tests). This allows incremental changes to the code base to be compared with more confidence. Current results are around 55k instructions per read, and 52k for writes. Closes #8563 * github.com:scylladb/scylla: test: perf: tidy up executor_stats snapshot computation test: perf: report instructions retired per operations test: perf: add RAII wrapper around Linux perf_event_open() test: perf: make executor_stats_snapshot() a member function of executor