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Last active August 29, 2015 14:12
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perf-flamegraphs.md

Why so slow? Creating a flamegraph of your program with perf

Flamegraphs can help to optimize the program a lot. So let's create one!

  • Install perf with use flag unwind enabled
  • Download flamegraph.pl and stackcolllapse-perf.pl
  • Run perf record -F 99 --call-graph dwarf -- ‹your program›
  • Do all the things that make your program slow
  • Close your program
  • Run perf script | stackcollapse-perf.pl > out.folded
  • And finally, flamegraph is created by flamegraph.pl out.folded > flamegraph.svg command
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