[rabbitmq-discuss] High load average with rabbitmq-server 3.1.x

[Daniel Bason]

Hi Matthias,

Thanks for the response, so the extra process queue during our peak message
throughput which in turn causes the load average to be reported much higher
is just a side effect of this?  We normally have about 600 connections
(mostly consumers) and our producers all publish to topic exchanges, we
have around 250 queues.

Regards
Dan


On Mon, Aug 19, 2013 at 6:52 PM, Matthias Radestock
<matthias at rabbitmq.com>wrote:

> Dan,
>
>
> On 19/08/13 03:58, Dan_b wrote:
>
>> We have recently upgraded from rabbitmq-server 2.6.1 to 3.1.x (we have one
>> cluster running 3.1.5 and one running 3.1.3).  On both servers we have
>> seen
>> the load average increase significantly, with it peaking up to 2x the
>> number
>> cores.  The CPU utilization and IO wait aren't affected and it seems to be
>> down to internal locks.
>>
>
> I'd guess those FUTEXes have something to do with timers. They are
> immediately followed by fsyncs, which in rabbit are typically triggered by
> timers. So the sequence you are seeing is
>
> 1. write message to disk
> 2. wait for timer to expire
> 3. fsync
>
> e.g.
>
>
>  write(27,
>> "\0\0\0\0\0\3\324=\226(\16\**265\355\200\307\7J\34b\4\240\"**
>> \355)\0\0\0\0\0\0\0\0"...,
>> 48) = 48
>> futex(0x2aaaab594524, FUTEX_WAIT_PRIVATE, 235521, NULL) = -1 EAGAIN
>> (Resource temporarily unavailable)
>> futex(0x2aaaab5944f8, FUTEX_WAKE_PRIVATE, 1) = 0
>> fsync(27)                               = 0
>>
>
> So nothing to worry about.
>
> Matthias.
>



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