flame_graph_examples

Flame graphs are a visualization of profiled software, allowing the most frequent code-paths 
to be identified quickly and accurately. 

http://www.brendangregg.com/Slides/LISA13_Flame_Graphs.pdf 

http://www.brendangregg.com/flamegraphs.html

git clone https://github.com/brendangregg/FlameGraph.git

# example 1
sudo perf record -a -g -F 97 sleep 60
sudo perf script -f > out.stacks
 ~/src/FlameGraph/stackcollapse-perf.pl < out.stacks| grep -v cpu_idle > out.folded
~/src/FlameGraph/flamegraph.pl --title="Flame"  out.folded >  out.svg
view out.svg with web browser.

# example 2
$ sudo perf record -e cycles -ag -C 2  // control-c to stop recording
$ sudo perf report --stdio
$ sudo perf script > out.data
$ cat out.data | ~/src/FlameGraph/stackcollapse-perf.pl  >  out.filtered
$ cat out.filtered | ~/src/FlameGraph/flamegraph.pl > out.svg
$ less out.filtered