[rabbitmq-discuss] RabbitMQ Latency

Wed Aug 22 22:35:40 BST 2012

On 08/20/2012 06:53 PM, Matthias Radestock wrote:
>
> The wireshark trace Tom submitted in another thread clearly shows a 
> 40ms delay from the 'publish' going out to the 'deliver' coming back. 
> And I've reproduced the same result on my machine.
>
> ...
>
> The difference could be down to Nagle (the Java client disables it by 
> default; no idea what node-amqp does) or buffer flushing (the Java 
> client flushes output buffers after complete commands, i.e. at the end 
> of the three frames in case of a short basic.publish; no idea what 
> node-amqp does), or some node-amqp/node.js weirdness.

On every benchmark that I've done on linux, I found that the Nagle 
algorithm causes a delay of almost exactly 40ms.

Any TCP client which disables the Nagle algorithm will get its latency 
improved at least by 20 times.