High CPU usage after system sleep/hibernate caused by Erlang process.

[Kristof Vervaeck]

Hello,

We are developing an application for  Windows 8,1 devices that uses a local RabbitMQ instance for communication with other local applications.

After a sleep or hibernate state of the OS, the Erlang process uses a lot of CPU power for a couple of minutes which causes RabbitMQ not to process any messages.

I found the problem is caused because Erlang tries to execute all the ticks that needed to be executed during the sleep/hibernate state of the OS.

It becomes a big problem if our devices have gone to sleep for about a weekend. The Erlang process needs 15 minutes to return to it's normal state.

We are using RabbitMQ 3.3.5, Erlang version 17.

Is there a possible solutions to this problem?

Thanks in advance,

Kristof Vervaeck

[Michael Klishin]

Your understanding is correct: it's various timers firing after instantaneous  system clock advancement. I doubt there is a way to avoid this but feel free to ask on the Erlang list.

MK

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[Kristof Vervaeck]

Hello,

I need to provide the +c argument to erl.exe. How can I achieve this within the configuration of RabbitMQ?

[Michael Klishin]

On 19 January 2015 at 15:45:55, Kristof Vervaeck (k.ver...@gmail.com) wrote:
> I need to provide the +c argument to erl.exe. How can I achieve
> this within the configuration of RabbitMQ?

See RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS  on http://www.rabbitmq.com/configure.html.

Note that for the env variable to take effect with the Windows service, you must *re-install* the service,
not just restart it.
--
MK

Staff Software Engineer, Pivotal/RabbitMQ