[erlang-patches] erlang:system_monitor long_message_queue

Henrik Nord <>
Tue Dec 10 14:32:07 CET 2013

Thank you for your contribution!

As you can see Lukas is already waiting for answers on the pull request.

On 2013-12-10 01:05, Micha? Ptaszek wrote:
> Hey All,
> https://github.com/erlang/otp/pull/161
> This patch adds a new option to the erlang:system_monitor BIF, 
> allowing to subscribe monitor process to the long_message_queue 
> events. It should be really helpful when investigating architectural 
> bottlenecks, as well as a part of regular logging procedures.
> Few comments about the implementation:
> - Monitor messages are generated once the message gets appended to the 
> receiver's message queue.
> - For a certain process - monitor message can be generated only once 
> after exceeding a pre-configured threshold. Erlang VM will resend the 
> monitor message only once the process mailbox size gets below the 
> limit and exceeds them again.
> - Info list of the monitor message currently contains only receiver's 
> message queue length. If you have any ideas on what might be useful to 
> put there in addition to the mailbox size - please let me know.
> _
> _
> Thanks,
> Michal
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> http://erlang.org/mailman/listinfo/erlang-patches

/Henrik Nord Erlang/OTP

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