AMQ214013: Failed to decode packet: java.lang.OutOfMemoryError: unable to create new native thread

valsaraj pv

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Jul 14, 2021, 8:35:14 AM7/14/21

to WildFly

Hi,

What might be the reason for the following error during load tests with concurrent users?

ERROR [org.apache.activemq.artemis.core.client] (Thread-286 (org.apache.activemq.artemis.core.remoting.impl.invm.InVMConnector)) AMQ214013: Failed to decode packet: java.lang.OutOfMemoryError: unable to create new native thread

Thanks!

Vesa Tuononen

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Jul 14, 2021, 8:54:44 AM7/14/21

to valsaraj pv, WildFly

Hi,

Seems to be OOME

Hard to say why if only see the log row.

SET system property to produce hprof file when OOME

Then open that file by using Eclipse Mat and check what data you have in memory.

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valsaraj pv

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Jul 15, 2021, 9:35:56 AM7/15/21

to WildFly

Is there any option to restrict the max number of threads like we set max limit on datasource?

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Valsaraj Viswanathan

Jasvant Singh

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Jul 16, 2021, 1:15:00 AM7/16/21

to WildFly

Hi,

In Linux there a limit to number of threads a user can create. When this limit is reached new thread creation throws up OutOfMemoryError. You can increase limit by 'ulimit' or decrease thread pool size to stay within limit.

Thanks,

Jasvant

valsaraj pv

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Jul 16, 2021, 4:11:44 AM7/16/21

to Jasvant Singh, WildFly

Thanks Jasvant!

Would you share how to decrease thread pool size?

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Jasvant Singh

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Jul 16, 2021, 8:33:47 AM7/16/21

to valsaraj pv, WildFly

Hi,

I am not sure how to decrease thread pool size but the following page can help you increase the system limit.

https://blog.bigdatawithjasvant.com/2020/07/javalangoutofmemoryerror-unable-to.html

Thanks,

Jasvant

Jasvant Singh

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Jul 16, 2021, 9:06:29 AM7/16/21

to valsaraj pv, WildFly

Hi,

"max user process" limit is for all processes running for that user.

You can run the "ps -fL -u <userid>" command to list all threads running for a user.

You might have to run this command as root because if you have hit the limit then this command might also fail to run.

There might be other applications which are causing problems rather than wildfly.

Thanks,

Jasvant

Jasvant Singh

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Jul 16, 2021, 9:15:04 AM7/16/21

to valsaraj pv, WildFly

The command "ps -fL <pid> |wc -l" will give you the number of threads for that process. My wildfly is consuming 100 threads.

Vesa Tuononen

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Jul 16, 2021, 9:47:22 AM7/16/21

to valsaraj pv, WildFly

Hi,

This documentation gives good knowledge how you can tune pools in WildFly.

https://access.redhat.com/documentation/en-us/jboss_enterprise_application_platform_continuous_delivery/18/html-single/performance_tuning_guide/index#io_workers

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