[rabbitmq-discuss] RabbitMq not honouring high_watermark setting?

Dan B danbarua at gmail.com
Wed Jul 13 13:27:07 BST 2011

Can I safely set Rabbit to hoover up 100% of the memory that's
available to Erlang under windows?



On Jul 13, 1:04 pm, Emile Joubert <em... at rabbitmq.com> wrote:
> On 13/07/11 12:55, Dan B wrote:
> > I should have RTFM a bit more thoroughly.
> >>> Thus when RabbitMQ can't recognize your platform, if you actually have 8GB RAM
> >>> installed and you want RabbitMQ to throttle producers when the server is using
> >>> above 3GB, set vm_memory_high_watermark to 3
> > On my server, vm_memory_high_watermark = n results in a watermark of
> > 2n for some reason. I've set it to 1.5 (3gb), I'm not sure if Rabbit
> > can access all of that though, probably not.
> You are certain to run out of memory at some point if you do that.
> Unfortunately the Windows Erlang VM is 32bit and limited to 2Gb. Some
> versions of Windows support an alternative memory model that may allow a
> suitably patched Erlang VM access to slightly more memory, but I don't
> know of anyone succeeding in making it work:
> http://support.microsoft.com/default.aspx?scid=kb%3BEN-US%3B297812
> -Emile
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