Question #254277 on sysbench changed:
https://answers.launchpad.net/sysbench/+question/254277
Status: Open => Answered
Alexey Kopytov proposed the following answer:
I guess the difference between prepare and run is that prepare creates a
new file, while 'run' with --file-test-mode=rndrw generates a mixed
read/write workload, which also does cached reads by default. So I/O
performance between the systems is amortized by the cache.
Things to try:
--file-test-mode=rndwr (i.e. a write-only workload)
or
--file-test-mode=rndrw --file-extra-flags=direct (i.e. a mixed read-write
workload, but with OS caching disabled via O_DIRECT).
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