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51e98e0e11
perf_fast_forward is used to detect performance regressions. The two main metrics used for this are fargments per second and the number of the IO operations. The former is a median of a several runs, but the latter is just the actual number of asynchronous IO operations performed in the run that happened to be picked as a median frag/s-wise. There's no always a direct correlation between frag/s and aio and the latter can vary which makes the latter hard to compare. In order to make this easier a new metric was introduced: "average aio" which reports the average number of asynchronous IO operations performed in a run. This should produce much more stable results and therefore make the comparison more meaningful. Message-Id: <20190430134401.19238-1-pdziepak@scylladb.com>