[teiid-issues] [JBoss JIRA] (TEIID-3106) BufferManager Cleaner consuming 90% of total CPU time
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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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Ok, there is another commit. I believe another possible issue was when the persistent
flag was set, which could cause an issue in that the insertion into the secondary queue
will modify the key while the entry is still in the initial queue.
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
Components: Query Engine
Affects Versions: 8.7
Environment: zOS
Reporter: Devesh Mishra
Assignee: Steven Hawkins
Labels: teiid-engine
Attachments: BufferManagerImpl.java, BufferManagerImpl.java, CacheKey_Loog.patch,
complete_log.zip, cpu monitoring.docx, dump.zip, in_local.docx, LrfuEvictionQueue.java,
LrfuEvictionQueue.patch, non_high_cpu.docx
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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