[rabbitmq-discuss] Generally known configuration for open file descriptor limits

[Dave Greggory]

Thanks, guys.


On Sep 21, 2010, at 10:57 AM, Matthew Sackman <matthew at rabbitmq.com> wrote:

> On Tue, Sep 21, 2010 at 03:50:37PM +0100, Marek Majkowski wrote:
>> You definitely need more file descriptors than number of connections.
>> 
>> As a rule of thumb I'd suggest:
>> - 1 file descriptor for every connection
>> - 3+ file descriptors for every queue that might be written to disk
> 
> Err, that's actually a max of 1 per queue.
> 
> And that is a rule of thumb - there is no problem with running a million
> queues off 1000 fds - rabbit will just cope as necessary, but you might
> find performance is improved with additional fds.
> 
> If your ulimit is X, then the number of connections you'll be allowed to
> open is (0.9*(X - 100))-2. Thus that should give you a minimum (via
> rearrangement). More fds never hurt!
> 
> Matthew
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