FreeBSD & Linux disk AIO support

[Igor Sysoev]

On Wed, Aug 26, 2009 at 04:20:56PM +0200, Robert Gabriel wrote:

> Igor Sysoev wrote:
> > On Wed, Aug 26, 2009 at 03:49:12PM +0200, Robert Gabriel wrote:
> > 
> >> Hi, it worked, it was build perfectly, but how can I know now if it's 
> >> using aio or not and what would be the "improvements" ?
> >> 
> >> Is there a way to test this?
> > 
> > You need set
> > 
> > location / {
> >     aio             on;
> >     directio        128k;
> >     output_buffers  1 128k;
> > }
> > 
> > I do not know how to learn if nginx uses AIO on Linux or not.
> > I can say it only for FreeBSD. On Linux I looked in debug log.
> 
> OK i guess, I have set it up for a few vhosts, Im not sure there is some 
> kind of improvement, as most of the vhosts are with php, but don't see 
> any slowness neither, so ... I'm not sure :)
> 
> P.S. I'm running it on Ubuntu 8.04.3 with 2.6.30.5 custom kernel.

You should see improvements on a host where whole hot static content
does not fit in the host physical memory.


-- 
Igor Sysoev
http://sysoev.ru/en/