MOM became unresponsive

Document ID : KB000101380
Last Modified Date : 26/07/2018
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Issue:
Our MOM within our 10.0 environment was responding very slowly to all end users (both workstation and webview).  I SSH into the MOM server and ran a top and I saw that the MOM Java process was running with +374% cpu (the MOM server has four cores and is a virtual server).  I attempted to run the EMCtrl.sh stop but it did not return.  I then ran a kill -9 on the MOM PID, stopped webview, then started the EM.  After the EM log seemed to have gotten to a point that the MOM was ready, I started WebView.

The question is what happened to cause the MOM to become unresponsive?
Environment:
APM 10.0 
Cause:
The MOM became unresponsive due to performing constant GC. The free memory started to keep dropping, and GC keeps going up, and eventually MOM was doing nothing but GC.
Resolution:
Set the G1GC JVM arguments on all EM if running Java 1.7/1.8 with a large heap 

https://comm.support.ca.com/kb/introscope-enterprise-manager-troubleshooting/kb000093176