Hi All,
For those of you that are interested in performance data, Brendan Gregg
wrote a really useful cheat sheet for perf that can give you some idea
of the things it can do beyond just profiling and performance counters.
The static and dynamic tracing capabilities are especially interesting.
We've used perf in-house for a while, but mostly just to create simple
profiling reports . Until recently, Ubuntu hasn't had dwarf support
compiled into perf in the default kernels, and RHEL was on a kernel that
was too old. For whatever reason it's been a constant battle getting
good symbol resolution in Ceph with just frame pointers and our debug
packages (in some cases purging and manually rebuilding the buildid
cache helped). Hopefully now between RHEL7 and Trusty we should be in a
good place to start making really good use of perf+dwarf though.
Here's Brendan's cheat sheet:
http://www.brendangregg.com/perf.html
Mark
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