[rabbitmq-discuss] Huge latency in Linux, compared with Leopard

Fri Sep 26 18:35:52 BST 2008

I tested very basic end-to-end latency of RabbitMQ 1.4.0 on Mac OS X Leopard
and RHET Linux.

A publisher prints out a timestamp right before it publishes a message, and
a subscriber receives the messages and prints out a timestamp. Every 3
second one process published a 1KB message. This is the very basic and easy
latency test I am always doing before I deploy systems.

But, the result was surprisingly comic.

Mac OS X Leopard: 4 milliseconds average latency from a publisher to a
subscriber
RHET5 Linux: 40.55 milliseconds average latency from a publisher to a
subscriber

I am using Erlang R12B-4, and compiled it from "./configure" and "make".
There was an error like a "JInterface" and "ODBC" stuffs at configuring from
Linux. I just ignored it.
All publisher, server, and subscriber were running at the same machine. So,
we can ignore the network delay on this test.

I tried also from Ubuntu 8.1 and its latency was also 40.55 milliseconds.
What is wrong with between Linux and Erlang?
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