High CPU Usage on servers with many cores

Products

• CA Application Performance Management Agent (APM / Wily / Introscope)
• INTROSCOPE

Issue/Introduction

After installing the Java Agent, CPU Usage spikes up 50% on servers with 100+ CPUs.

Environment

 Server with 100+ CPUs

Cause

  The high CPU was related to enabling platform monitoring and its gathering of aggregated CPU utilizations - particularly if multiple agents are trying to access the information simultaneously.

Resolution

Set the following agent parameter in the agent profile:
introscope.agent.disableAggregateCPUUtilization=true

If there are multiple agents on a server, all but one should be set to this to prevent CPU contention.