High CPU usage for Rabbit MQ on OpenShift?

Sherry Reese

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Jul 17, 2020, 4:29:24 AM7/17/20

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Hello guys,

we experience high CPU usage for our Rabbit MQ instances on all of our OpenShift nodes.

I'm not an Rabbit MQ expert but help to debug the issue. The Rabbit MQ guys seem to transfer (write) 4 Megabyte/second with Rabbit MQ and we can see that the Erlang process named beam.smp is using about 170% - 200% CPU for its work.

Any idea why the CPU usage is that high?

We are on Rabbit MQ 3.7.8 with Erlang 20.3.8.5.

It seems that after a restart the CPU user goes down for some time but after a while it rises again.

Can we try to tune something? Some buffer settings for large (2MB to 20MB) messages?

Cheers

Sherry

Warren Pang

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Jul 17, 2020, 4:32:17 AM7/17/20

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Hello

I would suggest you upgrade both RabbitMQ and Erlang to the latest versions.

The recent version has improved a lot on resource usage optimization, which might have helps to your case.

Thanks.

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Luke Bakken

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Jul 17, 2020, 7:29:39 AM7/17/20

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Hello,

Warren's suggestion to upgrade is good. Depending on your workload, this may help - https://www.rabbitmq.com/runtime.html#busy-waiting

Also, search this mailing list's archives for "busy CPU". The topic is discussed frequently.