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Posted to dev@uima.apache.org by "Jerry Cwiklik (JIRA)" <de...@uima.apache.org> on 2010/11/12 21:35:14 UTC
[jira] Created: (UIMA-1938) Modify UIMA AS Primitive Service to
optionally dump JVM stack if process() method takes too long
Modify UIMA AS Primitive Service to optionally dump JVM stack if process() method takes too long
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Key: UIMA-1938
URL: https://issues.apache.org/jira/browse/UIMA-1938
Project: UIMA
Issue Type: New Feature
Components: Async Scaleout
Reporter: Jerry Cwiklik
Assignee: Jerry Cwiklik
Priority: Minor
Fix For: 2.3.1AS
Add instrumentation to the UIMA AS Primitive service that will force JVM Stack dump if AE takes too long to process a CAS. Enable the instrumentation via -D variable. This enhancement may prove useful when debugging user code.
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[jira] Commented: (UIMA-1938) Modify UIMA AS Primitive Service to
optionally dump JVM stack if process() method takes too long
Posted by "Marshall Schor (JIRA)" <de...@uima.apache.org>.
[ https://issues.apache.org/jira/browse/UIMA-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931605#action_12931605 ]
Marshall Schor commented on UIMA-1938:
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When running Java 6, using http://download.oracle.com/javase/6/docs/api/java/lang/management/ThreadMXBean.html might be more "portable" and could also be used to find deadlocks, I think.
> Modify UIMA AS Primitive Service to optionally dump JVM stack if process() method takes too long
> ------------------------------------------------------------------------------------------------
>
> Key: UIMA-1938
> URL: https://issues.apache.org/jira/browse/UIMA-1938
> Project: UIMA
> Issue Type: New Feature
> Components: Async Scaleout
> Reporter: Jerry Cwiklik
> Assignee: Jerry Cwiklik
> Priority: Minor
> Fix For: 2.3.1AS
>
>
> Add instrumentation to the UIMA AS Primitive service that will force JVM Stack dump if AE takes too long to process a CAS. Enable the instrumentation via -D variable. This enhancement may prove useful when debugging user code.
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[jira] Closed: (UIMA-1938) Modify UIMA AS Primitive Service to
optionally dump JVM stack if process() method takes too long
Posted by "Jerry Cwiklik (JIRA)" <de...@uima.apache.org>.
[ https://issues.apache.org/jira/browse/UIMA-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jerry Cwiklik closed UIMA-1938.
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Resolution: Fixed
Modified Primitive Controller to optionally dump a JVM stack if AE takes too long to process a CAS. The instrumentation is enabled via -DdumpHeapThreshold=XX where XX is a max number of SECONDS the AE process method is allowed to process a CAS. Actually, the new instrumentation times three methods:
CasIterator casIterator = ae.processAndOutputNewCASes(aCAS);
casIterator.hasNext()
CAS casProduced = casIterator.next();
If the instrumentation is enabled and the timer pops and the JVM is forced to dump a stack. This instrumentation only works with IBM JVM which includes com.ibm.jvm.Dump class which enables stack dump via a static method JavaDump(). When running in Sun's JVM, the instrumentation is not enabled. The code uses reflection :
Class<?> dumpClass = Class.forName("com.ibm.jvm.Dump"); to determine if it is running in IBMs jvm.
> Modify UIMA AS Primitive Service to optionally dump JVM stack if process() method takes too long
> ------------------------------------------------------------------------------------------------
>
> Key: UIMA-1938
> URL: https://issues.apache.org/jira/browse/UIMA-1938
> Project: UIMA
> Issue Type: New Feature
> Components: Async Scaleout
> Reporter: Jerry Cwiklik
> Assignee: Jerry Cwiklik
> Priority: Minor
> Fix For: 2.3.1AS
>
>
> Add instrumentation to the UIMA AS Primitive service that will force JVM Stack dump if AE takes too long to process a CAS. Enable the instrumentation via -D variable. This enhancement may prove useful when debugging user code.
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