CPU & memory resource usage not measured when used with FDS connector & MPI

[alahiff]

When running FDS using multiple processors (e.g. 20 in my case) the CPU & memory usage is close to zero.

[wk9874]

Hmm, have a suspicion that the resource metrics actually arent tracking subprocesses at all :/

[wk9874]

It was tracking all subprocesses, but for some reason without an interval it always reports FDS's usage as 0. Added small 0.1 interval for all CPU metric collections. This shouldnt have a big impact on performance since it happens inside the heartbeat thread which only executes every multiple seconds anyway