Prediction Engine Stops Processing messages until restarted.

Products

• DX Unified Infrastructure Management (Nimsoft / UIM)

Issue/Introduction

The prediction_engine probe may stop processing messages over time.  The probe will be seen in Task Manager to be using 100% of the allocated RAM.  The prediction_engine queue will be seen to grow without reducing, until the probe is restarted, which will cause processing to resume again for a time.

Environment

Release: Any supported UIM release 
Component: prediction_engine 

Cause

This is caused by a combination of RAM settings and Java Garbage Collection.

Resolution

To resolve this issue, we will increase the amount of RAM allocated to the probe, and change the garbage collection method.

To do this, edit the prediction_engine.cfg and look for this section:

 

<startup>

   <opt>

      java_mem_init = -Xms64m

      java_mem_max = -Xmx512m

      java_opts = -XX:+UseConcMarkSweepGC -XX:+ScavengeBeforeFullGC -XX:+UseParNewGC

   </opt>

 

Change it to look like this:

 

<startup>

   <opt>

      java_mem_init = -Xms64m

      java_mem_max = -Xmx4096m

      java_opts = -XX:+UseG1GC 

   </opt>

 

Deactivate and re-activate the probe to accept the new settings.