[rabbitmq-discuss] Performance Issue
matthias at rabbitmq.com
Tue Jan 15 22:14:02 GMT 2013
On 15/01/13 21:56, Pavel Kogan wrote:
> I am playing now with basic.qos setting but I am not seeing 200Hz. I
> see 124Hz which is distributed 100 + 24 and not 62 + 62.
No idea why that would happen. Could be a quirk of the stats reporting
since evidently you are receiving more acks than messages, which cannot
possibly be true for anything other than brief periods.
> What is recommended value for prefetch_count for maximal throughput?
As high as possible, though I doubt anything much higher than 100 will
be beneficial in your case.
The downsides of high prefetch counts are:
- increase in client buffering requirements
- work load imbalance at consumers when work loads are non-uniform
- increased cost at broker when consumer connections are interrupted
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