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ODSEE Directory Proxy Server 11.1.1.5.0 - High CPU and server hang is possible with CMS garbage collection. (Doc ID 1554914.1)

Last updated on MAY 17, 2018

Applies to:

Oracle Directory Server Enterprise Edition - Version 11.1.1.5.0 to 11.1.1.5.0 [Release 11gR1]
Information in this document applies to any platform.

Symptoms

 After running normally for a period of time, DPS 11.1.1.5.0 consumes excessive CPU and may appear to be hung. Client requests are not processed. Garbage collection statistics from the JVM show a large number of full garbage collections and 100% utilization of old gen, similar to the following:

 

 Note that the "O" column (old generation) shows 100% occupancy, even as the total number of full garbage collections (FGC) increases.

Verbose garbage collection logging may also show "concurrent mode failure" and/or "Promotion failure" messages.

Changes

 JVM garbage collection was configured to use Concurrent Mark Sweep (CMS) with the JVM argument '-XX:+UseConcMarkSweepGC'.

This issue does not affect DPS with the default JVM configuration.

Cause

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