Confirmation of AIO

iberkner at iberkner at
Mon Oct 31 01:26:31 UTC 2011

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
To: nginx at
ReplyTo: nginx at
Subject: Re: Confirmation of AIO
Sent: Oct 30, 2011 8:40 PM


On Sun, Oct 30, 2011 at 02:28:30PM +0000, iberkner at 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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