[rabbitmq-discuss] rabbitmq with one producer no consumer
ovidiudeac at gmail.com
Sun Jul 18 21:10:56 BST 2010
Thanks for the info!
A few questions:
1. How stable is the new persister?
2. How can I try it?
3. When is it expected to be released?
On Sun, Jul 18, 2010 at 2:35 PM, Matthew Sackman <matthew at rabbitmq.com> wrote:
> 1. If your goal is to be able to use Rabbit to buffer large numbers of
> messages, larger than the amount of RAM you have available, then you
> need to be using the new persister.
> 2. The memory watermark is deliberately set at 0.4 because GC can
> temporarily cause twice as much memory to be required (so will jump to
> 0.8) and the remaining 0.2 is ideally left for OS disk buffers.
> 3. A 32-bit OS will only ever be able to allocate a maximum of 4GB to
> one process (and frequently 2GB).
> 4. If Erlang requires more memory than the OS can allocate to it, then
> it will crash. Thus setting the memory watermark to 0.98 will result in
> a crash as soon as a GC run causes Rabbit to use more than
> 0.98 * (min(4GB, installed RAM))
> 5. If you're using the new persister, you shouldn't have any need to
> move the watermark away from 0.4.
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