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scylladb/tests
Paweł Dziepak 51e98e0e11 tests/perf_fast_forward: report average number of aio operations
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>
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