APM 10.5.1 - MOM high resource usage on startup.

Document ID : KB000005922
Last Modified Date : 14/02/2018
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Issue:

   After starting MOM, users attempt to login using Workstation. While the Workstation login is successful, performing any operation occurs slowly. The cluster has a few thousand agents, uses many management modules and dashboards.

 

Environment:
APM 10.5
Cause:

While it appears that the cluster is healthy overall, it is noticed that when thread dumps are taken, GC (Garbage Collection) is very high.  

Resolution:

Add the following to the IntroscopeEnterpriseManager.lax file (or if on Windows and installed as a service - EMService.conf) to help relieve GC issues and make GC work more efficiently.

Keep in mind that the below settings may need to be tweaked for your environment as each environment differs from another.  Also please note that G1GC is for use with Java 8 and above, not below.

-XX:InitiatingHeapOccupancyPercent=35

-XX:+UseG1GC

-XX:+DisableExplicitGC

-XX:ParallelGCThreads=10

-XX:G1ReservePercent=20

 

 

Additional Information:

If the problem persists, then take heap dumps and thread dumps at the time of the issue.  Also collect perflogs at that time. Then open a case with CA Support and upload them to the ticket.