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| author | johannst <johannes.stoelp@gmail.com> | 2019-10-26 15:02:14 +0200 |
|---|---|---|
| committer | johannst <johannes.stoelp@gmail.com> | 2019-10-26 15:02:14 +0200 |
| commit | 128f0d09f07db89ead779a72ec37215e76b8d209 (patch) | |
| tree | 002579d6010995cd18f713eef87b6780d6b67a9f /debug.txt | |
| parent | 2520f38555c9afcd6bec50116807f8bf97311d43 (diff) | |
| download | notes-128f0d09f07db89ead779a72ec37215e76b8d209.tar.gz notes-128f0d09f07db89ead779a72ec37215e76b8d209.zip | |
added profiling info to debug notes
Diffstat (limited to 'debug.txt')
| -rw-r--r-- | debug.txt | 19 |
1 files changed, 18 insertions, 1 deletions
@@ -23,17 +23,34 @@ pmap <pid> # get supported events perf list +## show process stats perf stat -p <pid> perf stat -p <pid> -I <ms> +# select events of interests perf stat -p <pid> -e cycles,faults,cache-misses,context-switches # -K hide kernel threads perf top -F 99 -p <pid> -K -perf record -F 99 -p <pid> +## record measurement into db +# -g uses 'fb' = frame-pointer as default method to collect backtraces +# tell gcc to not optimize fp out -fno-omit-frame-pointer +perf record -F 99 -p <pid> -g +# use post processing and dwarf to collect backtraces perf record -F 99 -p <pid> --call-graph dwarf perf record -F 99 -p <pid> -e instructions,cpu-cycles,faults,cache-misses,context-switches +## report perf db +# print to stdio +perf report -n --stdio +# use tui +perf report -g graph,0.5,caller + +# flamegraph (https://github.com/brendangregg/FlameGraph) +# record events of interest, eg page-faults +perf stat -e page-faults -I 1000 -p 571 +perf script | FlameGraph/stackcollapse-perf.pl > out.perf-folded +FlameGraph/flamegraph.pl out.perf-folded > perf-trace.svg # print supported events ophelp |