During LSF last spring, Michael Rubin signed up to create a set of
writeback tests for use by the Linux community. Borrowing heavily
from Fengguang's tests at
http://www.kernel.org/pub/linux/kernel/people/wfg/writeback/dirty-throttling-v6/scripts/
I've created a test infrastructure for writeback testing, available from
http://google3-2.osuosl.org/?p=tests/wbtests.git;a=summary
See the README for details on how to run tests and report them.
It uses FIO, creating multiple FIO processes with possibly different
resource restrictions, and does as much sampling and tracing as is
available on the system during the test run.
The configurations available now are fairly minimal, and all use 1 or
2 disks; adding config files to use NFS or other setups should be
easy.
An example of the HTML reporting output available is in
extra/html-example.tar.gz ; untar this out and point a browser at
example/index.html and you can check it out. (Note, though, that this
example uses counters and a few tracepoint enhancements that aren't in
the upstream kernel -- e.g., "sdb WB pages" shows the cause of page
writeback over the benchmark run. We'd love to see these counters in
the mainline kernel, as they've been really helpful in debugging
problems, but they are somewhat intrusive.)
Comments welcome!
Thanks,
Curt
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