<HTML><html><head></head><body>Thanks Simon, I will try an upgrade and see if that helps<BR>
<BR>
-----Original Message-----<BR>
From: <a href="mailto:rabbitmq-discuss-bounces@lists.rabbitmq.com">rabbitmq-discuss-bounces@lists.rabbitmq.com</a> [mailto:rabbitmq-discuss-bounces@lists.rabbitmq.com] On Behalf Of Simon MacMullen<BR>
Sent: 09 August 2013 14:30<BR>
To: Discussions about RabbitMQ<BR>
Cc: Jim Swainston<BR>
Subject: Re: [rabbitmq-discuss] Queue Creation Rate and response times<BR>
<BR>
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).<BR>
<BR>
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.<BR>
<BR>
Cheers, Simon<BR>
<BR>
On 09/08/2013 11:22AM, Jim Swainston wrote:<BR>
> Hi,<BR>
><BR>
> Would anyone be able to give me some guidance on what I can expect <BR>
> from Rabbit regarding the rate of queue creation, and what I can do to <BR>
> increase it.<BR>
><BR>
> I have one Rabbit box with many virtual hosts, each host has a durable <BR>
> topic exchange.<BR>
><BR>
> The large majority of the time our system is creating approximately 5 <BR>
> queues per second with two bindings each across the whole rabbit box <BR>
> (I don't currently have figures for queue deletion) and each queue <BR>
> creation request averages about 350ms.<BR>
><BR>
> The queues are non-durable and make use of x-expires, x-message-ttl <BR>
> and auto-delete.<BR>
><BR>
> Recently I have started to get short lived spikes in queue creation up <BR>
> to approximately 20 queues per second across the whole rabbit box.<BR>
><BR>
> When this happens the queue creation request time can jump up to <BR>
> anywhere between 10000ms and 20000ms.<BR>
><BR>
> At the same time as this it appears as if the publishing request to <BR>
> these exchanges also increases from about 40ms to about 5000ms.<BR>
><BR>
> I am currently using RabbitMQ 2.8.6 on Erlang R13B03 running on an <BR>
> Ubuntu server with 2Gb RAM<BR>
><BR>
> Thanks<BR>
><BR>
> Jim<BR>
><BR>
><BR>
><BR>
><BR>
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--<BR>
Simon MacMullen<BR>
RabbitMQ, Pivotal<BR>
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