High CPU Usage by OpenDaylight

When running performance and scale tests to create hundreds of neutron resources and VMs we are seeing ODL CPU usage spike up to about 30-35 CPU cores on a 56 core system, which is exceptionally high sCPU usage by an standards. 

Here is a graph showing ODL CPU usage under load: https://snapshot.raintank.io/dashboard/snapshot/5xXv3VcHtg5mPtieqwJnQ6aIaKqdcR5H?orgId=2

Using flamegraphs (attached) to profile ODL undercloud, we see a lot of CPU time being spent by the GC and SpinPause method is directly on the CPU