[rabbitmq-discuss] cpu & network usage

[shridharan.m]

Hello Simon, 
     Oops. I meant to say I removed acks. 

Shri


Simon MacMullen <simon at rabbitmq.com> wrote:Are you saying you turned *off* auto-ack - i.e. you turned 
acknowledgements on? If so, that would account for greater network and 
CPU use.

Cheers, Simon

On 04/12/2013 23:11, shridharan muthu wrote:
> Hello there,
>       As a performance optimization on our rabbit mq cluster (of 2
> nodes), I removed following from a high volume non-durable queue
>
>  1. AMQP_MANDATORY flag during publish and
>  2. AMQP_AUTOACK during consume.
>
>   As a result the number of messages on that queue went down from 150 to
> 15 which is fantastic and expected. But this also increased overall cpu
> usage from 22% to 32% with an increased network traffic from 30k
> packets/sec to 40k packets/sec. The ingress & egress rate stayed the
> same before and after the change i.e. around 300 msgs/sec.
>
>    So, my question is why would network traffic increase when I make all
> calls asynchronous when the ingress & egress rate is same ?
>
> More info about the cluster:
> shri at mq1:~$ sudo rabbitmqctl status
> Status of node rabbit at mq1 ...
> [{pid,11689},
>   {running_applications,
>       [{rabbitmq_management,"RabbitMQ Management Console","3.0.2"},
>        {rabbitmq_management_agent,"RabbitMQ Management Agent","3.0.2"},
>        {rabbit,"RabbitMQ","3.0.2"},
>        {os_mon,"CPO  CXC 138 46","2.2.4"},
>        {rabbitmq_mochiweb,"RabbitMQ Mochiweb Embedding","3.0.2"},
>        {webmachine,"webmachine","1.9.1-rmq3.0.2-git52e62bc"},
>        {mochiweb,"MochiMedia Web Server","2.3.1-rmq3.0.2-gitd541e9a"},
>        {mnesia,"MNESIA  CXC 138 12","4.4.12"},
>        {amqp_client,"RabbitMQ AMQP Client","3.0.2"},
>        {xmerl,"XML parser","1.2.3"},
>        {inets,"INETS  CXC 138 49","5.2"},
>        {sasl,"SASL  CXC 138 11","2.1.8"},
>        {stdlib,"ERTS  CXC 138 10","1.16.4"},
>        {kernel,"ERTS  CXC 138 10","2.13.4"}]},
>   {os,{unix,linux}},
>   {erlang_version,
>       "Erlang R13B03 (erts-5.7.4) [source] [64-bit] [smp:12:12] [rq:12]
> [async-threads:30] [hipe] [kernel-poll:true]\n"},
>   {memory,
>       [{total,469535752},
>        {connection_procs,17995944},
>        {queue_procs,11675696},
>        {plugins,230048},
>        {other_proc,126014264},
>        {mnesia,18446743803509563784},
>        {mgmt_db,12530864},
>        {msg_index,1934440},
>        {other_ets,-18446743803280937440},
>        {binary,5524296},
>        {code,18395964},
>        {atom,3440321},
>        {other_system,43167571}]},
>   {vm_memory_high_watermark,0.4},
>   {vm_memory_limit,5047128883},
>   {disk_free_limit,1000000000},
>   {disk_free,482189381632},
>   {file_descriptors,
>       [{total_limit,65436},
>        {total_used,309},
>        {sockets_limit,58890},
>        {sockets_used,298}]},
>   {processes,[{limit,1048576},{used,2992}]},
>   {run_queue,7},
>   {uptime,23771203}]
> ...done.
>
>
> Thank you,
> Shri
>
>
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