[Bugs] [Bug 1261700] RFE : Feature: Periodic FOP statistics dumps for v3.6.x/v3.7.x

bugzilla at redhat.com bugzilla at redhat.com
Tue Sep 22 21:34:08 UTC 2015


https://bugzilla.redhat.com/show_bug.cgi?id=1261700



--- Comment #3 from rwareing at fb.com ---
Added example output.  Also, this is automatically engaged when either of these
options is enabled:

diagnostics.latency-measurement
diagnostics.count-fop-hits

and 

diagnostics.ios-dump-interval 

...is set to something non-zero.

We run with these enabled 24x7 on all clusters at all times, and as you have
noted it's extremely powerful to be able to look at performance from all layers
of the stack (FUSE client, gNFSd and bricks).  And with lockless counters (also
in this patch) we haven't observed any perf hit.

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