[rabbitmq-discuss] rabbitmq cpu usage can not be more than 700%
simon at rabbitmq.com
Tue Mar 12 16:14:44 GMT 2013
You will not be using HiPE if your configuration contains
It might also be worth trying Erlang R16B - I believe they've been
working on better support for more cores.
On 12/03/13 02:51, Xie Yunpeng wrote:
> the server is a pc server,not a NUMA,
> i think the case is using HiPE,becase it exactly 700%, just occasionally
> surpass 1~3%, but it shows me
> $ ./rabbitmqctl environment | grep hipe
> * in my test one thread is create one connection,so i use hunderd of
> connection to send/recv messages.
> * it really cpu-bound, memory/disk/network is not bound, the system 1
> min load is only 9~10
> * add RABBITMQ_SERVER_ERL_ARGS args is not work
> i think the best method is to run a cluster on a single machine
> 2013/3/7 Simon MacMullen <simon at rabbitmq.com <mailto:simon at rabbitmq.com>>
> First of all, the biggest machine I have available to test with is 8
> cores, so 24 cores is somewhat unknown territory for me. Is this a
> NUMA machine? However, with that in mind I did some quick tests.
> I was able to get 797% CPU usage with only 4 producer / queue /
> consumer sets. So it is possible to get past 700%. Interestingly, I
> got stuck at ~700% when using HiPE - do you have HiPE switched on?
> If not, there are a few things to test:
> * Just to check - you didn't say how many connections you used. If
> you are running all those send / receive threads through one or two
> connections you may find that is limiting you.
> * Check you really are CPU-bound - if you are publishing persistent
> messages or your queues are becoming large you are probably
> disk-bound. If you are publishing large messages you may be
> network-bound. One way to test this is with the run queue length,
> exposed in "rabbitmqctl status" or "Overview" > <node name> >
> "Advanced" in the management plugin. If this is non-zero you are
> * You may wish to experiment with adding some the scheduler flags
> documented at http://www.erlang.org/doc/man/__erl.html
> <http://www.erlang.org/doc/man/erl.html> to
> RABBITMQ_SERVER_ERL_ARGS, although this feels rather magical.
> * As a last resort, it is possible to run a cluster on a single
> machine; this might hwelp you use more cores. See
> Cheers, Simon
> On 07/03/13 08:14, Xie Yunpeng wrote:
> rabbitmq version: 3.0.2
> cpu: 24 cores
> memory: 64G
> i deploy a rabbitmq service on the server above and do a stress
> , use 150 threads for send and 300 threads for recv on 150
> queues on the
> service, per queue with 1 send/ 2 recv.
> the cpu useage is always below 700%, no matter i increase queues and
> threads or not.
> how to use more than 7 cores in rabbitmq?
> i find smp is set to 24:24
> [rabbitmq]$ erl
> Erlang R15B03 (erts-22.214.171.124) [source] [64-bit] [smp:24:24]
> [async-threads:0] [hipe] [kernel-poll:false]
> Eshell V126.96.36.199 (abort with ^G)
> rabbitmq-discuss mailing list
> rabbitmq-discuss at lists.__rabbitmq.com
> <mailto:rabbitmq-discuss at lists.rabbitmq.com>
> Simon MacMullen
> RabbitMQ, VMware
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