[rabbitmq-discuss] So who's Judy and what does she have to do with the High Speed TCP driver for Erlang?

Simon MacMullen simon at rabbitmq.com
Wed Jul 18 16:25:41 BST 2012

On 18/07/12 16:11, Matthias Radestock wrote:
>> Can you say anything about how much better things are this way? E.g.
>> some percentage improvement to throughput, presumably?
> I don't remember and it would take me a while to dredge up the information.

...and the changes:

a) Came in a bit at a time over several releases.
b) Vary in benefit hugely depending on message size (and to a lesser 
extent on other things).

As a one-off example, on my machine (Dell Precision T3500), single 
producer, single consumer with no acks or persistence, I get end to end:

RabbitMQ 2.8.0, 100 byte messages: ~27,000 msg/s
RabbitMQ 2.8.4, 100 byte messages: ~29,000 msg/s

RabbitMQ 2.8.0, 100 kilobyte messages: ~1,200 msg/s
RabbitMQ 2.8.4, 100 kilobyte messages: ~4,200 msg/s

So that's either a 7% improvement or a 250% improvement. Your pick.

Note that we started on the latest round of reader tuning before 2.8.0, 
but that's the first version that's easy to benchmark due to flow control.

But as usual, the moral is: There Are Tons Of Variables, Do Your Own 
Testing :-)

Cheers, Simon

Simon MacMullen
RabbitMQ, VMware

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