[rabbitmq-discuss] does rabbit eat memory?

[Robert Fuller]

On 26 November 2010 16:30, Jason J. W. Williams
<jasonjwwilliams at gmail.com> wrote:
> Have you tried setting vm_memory_high_watermark in the rabbitmq.config file?
No. I understand this can be used for flow control. Does it also
trigger garbage collection?

> -J
>
> On Fri, Nov 26, 2010 at 9:15 AM, Robert Fuller <fullergalway at gmail.com> wrote:
>> Hi,
>>
>> Rabbitmq is very nice. Easy to install, and very easy to get running with it.
>>
>> We are experimenting using the java interfaces. We are publishing json
>> messages of various sizes to a queue from several servers. A single
>> thread is consuming these messages, acknowledging each message.
>>
>> Having noticed memory consumption on our server I ran a test of using
>> a clean install, and adding 3600 messages to the queue, then consuming
>> these messages and checking for memory usage using top command. I
>> notice that the memory used by rabbitmq slowly creeps upwards.
>>
>> Is there a step I am missing to free some memory?
>>
>> ps and status output below.
>>
>> Thanks,
>> Rob.
>>
>> Here is the ps line at each stage:
>>
>>  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>> before publishing any messages:
>> 26643 rabbitmq  20   0  278m  34m 2844 S    0  0.2   0:01.43 beam.smp
>> after publishing 3666 messages to the queue:
>> 26643 rabbitmq  20   0  315m  65m 2924 S    0  0.4   0:05.21 beam.smp
>> consuming the messages from the queue.
>> after 1st cycle: (zero messages now in queue)
>> 26643 rabbitmq  20   0  300m  52m 2924 S    0  0.3   0:08.18 beam.smp
>> publish 3666 messages with consumer running...
>> after 2nd cycle:  (zero messages now in queue)
>> 26643 rabbitmq  20   0  306m  63m 2924 S    0  0.4   0:14.30 beam.smp
>> publish 3666 messages with consumer running...
>> after 3rd cycle:  (zero messages now in queue)
>> 26643 rabbitmq  20   0  316m  72m 2924 S    0  0.5   0:18.72 beam.smp
>> later, with all publisher/consumer connections now closed:
>> 26643 rabbitmq  20   0  316m  72m 2924 S    0  0.5   0:19.87 beam.smp
>>
>>
>> Output of status command follows:
>> Status of node rabbit at test ...
>> [{running_applications,
>>     [{rabbit_management,"RabbitMQ Management Console","2.1.1"},
>>      {webmachine,"webmachine","1.7.0"},
>>      {amqp_client,"RabbitMQ AMQP Client","2.1.1"},
>>      {rabbit,"RabbitMQ","2.1.1"},
>>      {mnesia,"MNESIA  CXC 138 12","4.4.12"},
>>      {os_mon,"CPO  CXC 138 46","2.2.4"},
>>      {sasl,"SASL  CXC 138 11","2.1.8"},
>>      {rabbit_mochiweb,"RabbitMQ Mochiweb Embedding","2.1.1"},
>>      {mochiweb,"MochiMedia Web Server","1.3"},
>>      {crypto,"CRYPTO version 1","1.6.3"},
>>      {inets,"INETS  CXC 138 49","5.2"},
>>      {stdlib,"ERTS  CXC 138 10","1.16.4"},
>>      {kernel,"ERTS  CXC 138 10","2.13.4"}]},
>>  {nodes,[{disc,[rabbit at test]}]},
>>  {running_nodes,[rabbit at test]}]
>> ...done.
>>
>>
>> $ uname -a
>> Linux test 2.6.32-25-server #45-Ubuntu SMP Sat Oct 16 20:06:58 UTC
>> 2010 x86_64 GNU/Linux
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>>
>