Confirmation of AIO

[iberkner at gmail.com]

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 at nginx.org
To: nginx at nginx.org
ReplyTo: nginx at 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 at 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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