[OPENJPA-1898] TestQueryMultiThreaded fails with OOME "unable to create new native thread"

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.1
• Fix Version/s: 2.1.0, 2.2.0
• Assignee: Michael Dick
• Reporter: Mark Struberg
• Created: 29/Nov/10 16:37
• Updated: 13/Jul/11 16:11
• Resolved: 30/Nov/10 20:19

Description

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.