[rabbitmq-discuss] Queue Creation Rate and response times

Fri Aug 9 15:15:57 BST 2013

Thanks Simon, I will try an upgrade and see if that helps

-----Original Message-----
From: rabbitmq-discuss-bounces at lists.rabbitmq.com [mailto:rabbitmq-discuss-bounces at lists.rabbitmq.com] On Behalf Of Simon MacMullen
Sent: 09 August 2013 14:30
To: Discussions about RabbitMQ
Cc: Jim Swainston
Subject: Re: [rabbitmq-discuss] Queue Creation Rate and response times

There was a bug (fixed in 2.8.7) where deleting non-durable things triggered an fsync. (Deleting durable things will cause an fsync anyway).

I assume if you're creating 20 queues/sec you're probably deleting at a similar rate? Depending on how fast your system can fsync that might be a problem.

Cheers, Simon

On 09/08/2013 11:22AM, Jim Swainston wrote:
> Hi,
>
> Would anyone be able to give me some guidance on what I can expect 
> from Rabbit regarding the rate of queue creation, and what I can do to 
> increase it.
>
> I have one Rabbit box with many virtual hosts, each host has a durable 
> topic exchange.
>
> The large majority of the time our system is creating approximately 5 
> queues per second with two bindings each across the whole rabbit box 
> (I don't currently have figures for queue deletion) and each queue 
> creation request averages about 350ms.
>
> The queues are non-durable and make use of x-expires, x-message-ttl 
> and auto-delete.
>
> Recently I have started to get short lived spikes in queue creation up 
> to approximately 20 queues per second across the whole rabbit box.
>
> When this happens the queue creation request time can jump up to 
> anywhere between 10000ms and 20000ms.
>
> At the same time as this it appears as if the publishing request  to 
> these exchanges also increases from about 40ms to about 5000ms.
>
> I am currently using RabbitMQ 2.8.6 on Erlang R13B03 running on an 
> Ubuntu server with 2Gb RAM
>
> Thanks
>
> Jim
>
>
>
>
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--
Simon MacMullen
RabbitMQ, Pivotal
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