2020-11-14 17:28:17 +03:00
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#!/usr/bin/env sh
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2020-05-08 22:15:08 +03:00
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# To enable the required permissions, execute the following sequence as root:
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# $ chown root:wheel /proc/modules
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# $ chown root:wheel /proc/kallsyms
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# $ echo 0 > /proc/sys/kernel/kptr_restrict
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# $ echo -1 > /proc/sys/kernel/perf_event_paranoid
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#
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# Usage:
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#
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# Profile an executable
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# ./flamegraph.sh <executable>
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#
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# To change the frequency:
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# HZ=100 ./flamegraph.sh <executable>
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#
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# To use the maximum frequency
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# HZ=max ./flamegraph.sh <executable>
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#
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# This can be useful to see how much time is spent in carp vs clang
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# ./flamegraph.sh ./carp.sh -b <file.carp>
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HZ=${HZ:-1000}
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prg=`basename $1`
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svg=flamegraph.svg
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perf record -F $HZ -a -g -- $*
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perf script | stackcollapse-perf.pl | flamegraph.pl > $svg
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xdg-open $svg
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