[rabbitmq-discuss] Performance Issue

Mon Jan 14 21:33:21 GMT 2013

Maybe you could take a look at your basic_qos settings, setting the
prefetch_count to some reasonable number?

See http://www.rabbitmq.com/amqp-0-9-1-quickref.html#basic.qos

and
http://www.rabbitmq.com/blog/2011/10/27/performance-of-queues-when-less-is-more/

Regards,

Alvaro

On Mon, Jan 14, 2013 at 10:21 PM, Pavel Kogan <pavel.kogan at cortica.com>wrote:

> Hi all,
>
> I have a rabbit server on single dedicated CentOS machine (Quad Core with
> 16Gb RAM) connected to 1Gbit LAN.
> I have many queues running, but total number of messages is not very high
> for such a machine.
>
> The problem is following:
> 1) I connect client A to some queue (with many many messages ready) with
> some routing key - it processes 150 messages per sec (its limit).
> 2) I connect another client A in parallel on identical server to same
> queue with same routing key. Now I have 2 identical consumers on same queue
> and messages are distributed on round robin
>     manner, but somehow second unit receives only 50 messages per sec.
> 3) If I disconnect A1, A2 starts working normally. If I connect A1 back it
> becomes a slow node.
>
> The model is TOPIC with acknowledgments.
> Attached screenshots from manager and top command on rabbit machine.
> Did anyone experience similar problem?
>
> Thanks a lot,
>    Pavel
>
>
>  Publish*148*msg/s
> Deliver*744*msg/s
> Redelivered*0.00*msg/s
> Acknowledge*746*msg/s
>
>
>
>
>
>
>
>
> Name File descriptors (?)(used / available) Socket descriptors (?)(used /
> available) Erlang processes(used / available) MemoryDisk space UptimeType
> 297 / 1024
> 135 / 829
> 16815 / 1048576
> 826.6MB
> 6.2GB high waterm
>
>
> Tasks: 598 total,   1 running, 597 sleeping,   0 stopped,   0 zombie
> Cpu0  : 29.8%us,  6.0%sy,  0.0%ni, 64.2%id,  0.0%wa,  0.0%hi,  0.0%si,
>  0.0%st
> Cpu1  : 33.2%us,  5.6%sy,  0.0%ni, 61.1%id,  0.0%wa,  0.0%hi,  0.0%si,
>  0.0%st
> Cpu2  : 34.7%us,  6.1%sy,  0.0%ni, 59.3%id,  0.0%wa,  0.0%hi,  0.0%si,
>  0.0%st
> Cpu3  : 30.1%us,  4.7%sy,  0.0%ni, 64.5%id,  0.7%wa,  0.0%hi,  0.0%si,
>  0.0%st
> Cpu4  : 29.7%us,  5.3%sy,  0.0%ni, 65.0%id,  0.0%wa,  0.0%hi,  0.0%si,
>  0.0%st
> Cpu5  : 34.2%us,  6.2%sy,  0.0%ni, 56.8%id,  0.0%wa,  0.0%hi,  2.7%si,
>  0.0%st
> Cpu6  : 19.9%us,  3.4%sy,  0.0%ni, 76.4%id,  0.0%wa,  0.0%hi,  0.3%si,
>  0.0%st
> Cpu7  :  2.3%us,  1.0%sy,  0.0%ni, 96.7%id,  0.0%wa,  0.0%hi,  0.0%si,
>  0.0%st
> Mem:  16217336k total, 13285852k used,  2931484k free,   191072k buffers
> Swap:  2097144k total,     4904k used,  2092240k free, 10533540k cached
>
>  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>
>
> 19404 rabbitmq  20   0 3551m 806m 2480 S 254.6  5.1  21417:07 beam.smp
>
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