Capture flameGraph on each simulation

Having a flameGraph per simulation will give a good idea of simulation limitation in a compact format and should not impact performance.

This requires some additional tools on the Nuxeo instance: linux-tools linux-cloud-tools perf-map-agent jmaps and FlameGraph.

A 30s flamegraph requires:

• to run "perf record -F 99 -a -g – sleep 30;" it generates a ~3.5M perf.data file.
• to run "jmaps" to get the java mappping it generates 1.1M file
  the svg generated is around 1M

May be there is a tool to create 30s svg of a JVM process.