Memory Leak On weblogic.rjvm.ConnectionManager Generating A High Rate Of Old Collections Making System Perform Poorly
(Doc ID 1437125.1)
Last updated on MARCH 12, 2021
Applies to:Oracle WebLogic Server - Version 9.2 to 10.3.5
Information in this document applies to any platform.
Periodically, an environment gets caught in a cycle where several OC collections are happening in a row. Often it appears there should be plenty of available heap. When this happens, the server starts behaving poorly, showing several performance problems.
- CPU consumption in average around 35% to 40%.
- High Rate of Old Collections. (Around 250 -> 300 per 30 minutes) Note that any high rate of OC can be considered suspicious.
- Poor performance and excessive latencies appear on the environment.
To detect the symptoms, collect a JRockit Flight Recording and a heap dump for the troubled server. If a flight recording is collected, the following will be the expected behavior:
- CPU usage will look similar to the following screenshot.
- General memory consumption will look similar to this:
- GC ratios will show a pattern similar to this one:
- A GC log will show the following pattern:
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