Profiling

#debian unstable see:http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html

apt-get install linux-tools-3.16 sudo apt-get install linux-tools-3.16 perf record -F 99 -p -g -- sleep 30

or if you have multiple pids:

perf record -F 99 -p -p -g -- sleep 30

and then exercise your app.