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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:

 

S0     S1     E      O      P     YGC     YGCT    FGC    FGCT     GCT
0.00   0.98   0.00  83.88  59.69 114723 1121.837    43    5.183 1127.020
1.23   0.00   4.32  85.77  59.69 115004 1124.664    43    5.183 1129.847
0.00   0.97  34.17  87.18  59.69 115281 1128.175    43    5.183 1133.359
0.00   0.00  85.10  99.04  59.68 115538 1134.709    87   37.092 1171.801
0.00   0.00 100.00  99.50  59.68 115712 1134.714   369  291.877 1426.591
0.00   0.00 100.00  99.63  59.68 115885 1134.720   651  541.969 1676.689
0.00   0.00  83.46 100.00  59.68 116032 1134.725   953  782.790 1917.515
0.00   0.00  54.20 100.00  59.68 116139 1134.728  1327  989.256 2123.984
0.00 100.00 100.00 100.00  59.68 116249 1134.732  1697 1199.383 2334.115
0.00 100.00 100.00 100.00  59.68 116356 1134.735  2063 1410.721 2545.457

 

 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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In this Document
Symptoms
Changes
Cause
Solution
References


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