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From Kirk <kirk.pepperd...@gmail.com>
Subject Re: Out of memory almost immediately after start
Date Tue, 29 Mar 2011 00:51:36 GMT
-Xmx sets max Java heap size where as -Xms set min Java heap size. Java threads take both Java
heap and native stack space. Fiddling with these values is unlikely to have any effect on
the number of threads being started. 10 threads should start without issue unless someone
is consuming a ton of memory or the default JMeter memory settings have been fiddled with
(like stack size).

Regards,
Kirk

On Mar 28, 2011, at 2:04 PM, Anthony Johnson wrote:

> We just had a similar thread related to this, but the problem is that
> Java itself does not have enough native memory left to create a
> thread.
> 
> This is going to be related to your -Xmx -Xms settings and the amount
> of threads that you are asking JMeter to run.
> 
> Try lowering your thread count, setting -Xms JVM setting and/or
> lowering the -Xmx value to allow for more native memory.
> 
> Their are other tricks as well, but the ones above should get you back on track.
> 
> Good luck,
> 
> Anthony
> 
> On Mon, Mar 28, 2011 at 7:34 AM, Cor-Paul Bezemer <c.bezemer@tudelft.nl> wrote:
>> I'm investigating a problem I have with one of my testcases and when I
>> inspect the log file, I see the following happen:
>> 
>> 2011/03/28 13:30:38 INFO  - jmeter.threads.JMeterThread: Thread started:
>> Stepping Thread Group 1-2
>> 2011/03/28 13:30:38 INFO  - jmeter.threads.JMeterThread: Thread started:
>> Stepping Thread Group 1-6
>> 2011/03/28 13:30:38 INFO  - jmeter.threads.JMeterThread: Thread started:
>> Stepping Thread Group 1-8
>> 2011/03/28 13:30:38 INFO  - jmeter.threads.JMeterThread: Thread started:
>> Stepping Thread Group 1-10
>> 2011/03/28 13:30:38 INFO  - jmeter.threads.JMeterThread: Thread started:
>> Stepping Thread Group 1-1
>> 2011/03/28 13:30:38 INFO  - jmeter.threads.JMeterThread: Thread started:
>> Stepping Thread Group 1-4
>> 2011/03/28 13:30:38 INFO  - jmeter.threads.JMeterThread: Thread started:
>> Stepping Thread Group 1-3
>> 2011/03/28 13:30:38 INFO  - jmeter.threads.JMeterThread: Thread started:
>> Stepping Thread Group 1-5
>> 2011/03/28 13:30:38 INFO  - jmeter.threads.JMeterThread: Thread started:
>> Stepping Thread Group 1-7
>> 2011/03/28 13:30:38 INFO  - jmeter.threads.JMeterThread: Thread started:
>> Stepping Thread Group 1-9
>> 2011/03/28 13:30:38 ERROR - jmeter.engine.StandardJMeterEngine: Uncaught
>> exception:  java.lang.OutOfMemoryError: unable to create new native thread
>>         at java.lang.Thread.start0(Native Method)
>>         at java.lang.Thread.start(Unknown Source)
>>         at
>> org.apache.jmeter.engine.StandardJMeterEngine.run(StandardJMeterEngine.java:
>> 484)
>>         at java.lang.Thread.run(Unknown Source)
>> 
>> So an outofmemory exception is thrown almost immediately after starting the
>> tests... Does anyone have any idea what causes this?
>> It doesn't really seem to affect the test run but I want to make sure it
>> isn't.
>> 
>> Thanks! CP
>> 
>> 
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> 
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