How would you go about determining whether or not the benefits are there?

What metrics or quantitative analysis can you do to determine whether or not to use it?

------Original Message------
From: Maxim Dounin
Sender: nginx-bounces@nginx.org
To: nginx@nginx.org
ReplyTo: nginx@nginx.org
Subject: Re: Confirmation of AIO
Sent: Oct 30, 2011 8:40 PM

Hello!

On Sun, Oct 30, 2011 at 02:28:30PM +0000, iberkner@gmail.com wrote:

> I read that you don't get the file cache, so under what specific
> circumstances in linux would it be beneficial to use aio (if
> any)?

Using AIO under Linux would be beneficial if your working set is
big compared to memory available and as a result filesystem cache
doesn't improve things much. Better disk concurrency may
outweigh filesystem cache in such cases.

Maxim Dounin

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