[rabbitmq-discuss] MulticastMain Java client causes Erlang error eheap_alloc: Cannot allocate 467078560 bytes of memory (of type "heap") (with RabbitMQ 1.7.1)

[Gustavo Aquino]

Matthias,

Your are right Windows have a limitation to memory allocation per process,
and some versions of Windows is 2Gb the limitation, a long time ago I have a
lot of problems with it.

I don't know what type of windows John are using but this is a link of
Microsoft to talk about this limitations in all versions of windows.

http://msdn.microsoft.com/en-us/library/aa366778(VS.85).aspx

Regards.



On Tue, Jan 26, 2010 at 5:32 PM, Matthias Radestock <matthias at lshift.net>wrote:

> John,
>
> John Apps wrote:
> > Here are two runs, one with 0.4 and the other, below, with 0.3. Both
> > crash. The rabbit.log for the 0.3 test is attached. The 0.4 test did not
> > log any memory watermark messages, only the 0.3 test.
>
> I cannot see any memory alerts in the 0.3 test log either.
>
> The earlier 0.2 log, showed a limit of 817MB and a max value of ~1.3G.
> Assuming those ratios are similar for the 0.3 case (1225MB), it would
> indicate the O/S isn't happy with Rabbit asking for more than ~2GB of
> memory.
>
> Some quick googling on Erlang under Windows suggests that 2GB may in
> fact be a limit imposed by some flavours of Windows. Different flavours
> have different limits; somebody more familiar with Windows might be able
> to provide more precise information.
>
> I guess you'll have to stick to a limit of 0.2, or perhaps try 0.25.
>
> > />>>That's exactly what is supposed to happen. Rabbit has told the
> > producer to stop sending messages since it is under memory pressure.
> > Once memory becomes available again, e.g. when a consumer consumes
> > enough messages, or some queues get deleted/purged, or as a result of
> > internal garbage collection, Rabbit will tell the producer that it may
> > resume.
> > /
> >
> > The funny thing is that rabbitmqctl status returned a 'node down'
> > message. I suppose that is OK?
>
> No, that's not ok. Presumably rabbitmqctl normally works fine, right?
>
> Next time this happens, please do the following:
> - capture & report the complete output of rabbitmqctl
> - check whether the rabbit process is alive
> - assuming it is, report whether it's busy or idle
> - terminate the test program
> - try running rabbitmqctl again and report the results
> - post the complete rabbit.log and rabbit-sasl.log
>
>
> Regards,
>
> Matthias.
>
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