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Last active February 5, 2018 16:52
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java perf
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java-perf.md

tools

https://github.com/RRZE-HPC/likwid

http://jpbempel.blogspot.ie/2013/08/hardware-performance-counters.html

CoreFreq - CPU monitoring software designed for the 64-bits Processors

hints

Use CAS sparingly, especially for hot paths.

CState

- How do you know that you actually disabled all power management? I'd monitor cstate and pstate to see what they actually are over time. Cool anecdote: We once had a case where something in the system was mysteriously elevating cstate away from 0 after we set to to 0. We never did find out what it was. The case was "resolved" with a cron job that set cstate to 0 every minute (yuck. I know). (Gil Tene)

https://gist.github.com/wmealing/2dd2b543c4d3cff6cab7

Only new and overhyped platforms don’t have problems, because nobody cares enough yet to discover them

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