For best results the C source should be built with -g -O0.
Run the server, record performance events with -F frequency 997 Hz, -a all processes and -g take stack info.
python examples/simple/simple.py -p c & \
perf record -F 997 -a -g -- sleep 59 & \
sleep 1 && ./wrk -c 100 -t 1 -d 60 http://localhost:8080 &
Write data to a text file filtering for pid 2836 (should be server process)
perf script --pid 2836 > out.perf
Remove address info to make graphs easier to read
python cleanup_script.py out.perf > out2.perf
./stackcollapse-perf.pl out2.perf > out.folded
./flamegraph.pl out.folded > test.svg