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Date: Tue, 30 Nov 2010 04:15:10 -0500 (EST)
From: "Mark Struberg (JIRA)" <jira@apache.org>
To: dev@openjpa.apache.org
Subject: [jira] Updated: (OPENJPA-1898) TestQueryMultiThreaded fails with
 OOME "unable to create new native thread"
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     [ https://issues.apache.org/jira/browse/OPENJPA-1898?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mark Struberg updated OPENJPA-1898:
-----------------------------------

    Attachment: OPENJPA-1898.patch

reduce parallel threads from 1000 to 800. Now it's not very likely that any user hits the default 1024 threads limit, but we still have enough parallel loops running

> TestQueryMultiThreaded fails with OOME "unable to create new native thread"
> ---------------------------------------------------------------------------
>
>                 Key: OPENJPA-1898
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1898
>             Project: OpenJPA
>          Issue Type: Bug
>    Affects Versions: 2.0.1
>            Reporter: Mark Struberg
>         Attachments: OPENJPA-1898.patch
>
>
> here comes the stacktrace:
> <error message="unable to create new native thread" type="java.lang.OutOfMemoryError">java.lang.OutOfMemoryError: unable to create new native thread
>         at java.lang.Thread.start0(Native Method)
>         at java.lang.Thread.start(Thread.java:597)
>         at org.apache.openjpa.slice.TestQueryMultiThreaded.testHeavyLoad(TestQueryMultiThreaded.java:236)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at junit.framework.TestCase.runTest(TestCase.java:154)
> reducing the thread count to 800 should help to prevent this problem. This might be caused to the 1024 processes ulimit on most linux installations.

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