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https://issues.jboss.org/browse/TEIID-3106?page=com.atlassian.jira.plugin...
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Steven Hawkins commented on TEIID-3106:
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Devesh, it would probably be best to collect cpu stats from a profiling run rather than
looking for a spike and a thread dump, unless the spike is sustained for a substantial
period of time. The stack that is being shown there unfortunately doesn't help
clarify what you might be seeing. Do you have additional log entries indicating what may
be occuring?
Mark, I'm not sure what you mean. Which comparison are you referring to?
BufferManager Cleaner consuming 90% of total CPU time
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Key: TEIID-3106
URL:
https://issues.jboss.org/browse/TEIID-3106
Project: Teiid
Issue Type: Bug
Security Level: Public(Everyone can see)
Components: Query Engine
Affects Versions: 8.7
Environment: zOS
Reporter: Devesh Mishra
Assignee: Steven Hawkins
Labels: teiid-engine
Attachments: BufferManagerImpl.java
BufferManager Cleaner thread is consuming almost all of the CPU utilized by the jboss
process. Thread dump shows following information.
3XMTHREADINFO "BufferManager Cleaner" J9VMThread:0x0000004C41CFEB00,
j9thread_t:0x0000004C52B85AE0, java/lang/Thread:0x000000481C036E20, state:CW, prio=5
3XMJAVALTHREAD (java/lang/Thread getId:0x76, isDaemon:true)
3XMTHREADINFO1 (native thread ID:0x3AEC2600, native priority:0x5, native
policy:UNKNOWN)
3XMHEAPALLOC Heap bytes allocated since last GC cycle=2609184 (0x27D020)
3XMTHREADINFO3 Java callstack:
4XESTACKTRACE at
java/util/concurrent/ConcurrentSkipListMap.doRemove(ConcurrentSkipListMap.java:1070(Compiled
Code))
4XESTACKTRACE at
java/util/concurrent/ConcurrentSkipListMap.remove(ConcurrentSkipListMap.java:1659(Compiled
Code))
4XESTACKTRACE at
org/teiid/common/buffer/impl/LrfuEvictionQueue.remove(LrfuEvictionQueue.java:60(Compiled
Code))
4XESTACKTRACE at
org/teiid/common/buffer/impl/BufferManagerImpl.doEvictions(BufferManagerImpl.java:854(Compiled
Code))
5XESTACKTRACE (entered lock:
org/teiid/common/buffer/CacheEntry@0x00000048393C2598, entry count: 1)
4XESTACKTRACE at
org/teiid/common/buffer/impl/BufferManagerImpl$Cleaner.run(BufferManagerImpl.java:108)
4XESTACKTRACE at java/util/TimerThread.mainLoop(Timer.java:555)
4XESTACKTRACE at java/util/TimerThread.run(Timer.java:505)
When we added log statements around the BufferManagerImpl.doEvictions() it loops through
the remove and firstEntry loop.
Forum discussion link :
https://community.jboss.org/message/901792
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