From: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
---|---|
To: | David Boreham <david_list(at)boreham(dot)org> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: ice-broker scan thread |
Date: | 2005-11-29 16:47:00 |
Message-ID: | 20051129164651.GF31333@svana.org |
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Thread: | |
Lists: | pgsql-hackers |
On Tue, Nov 29, 2005 at 08:42:18AM -0700, David Boreham wrote:
>
> >Unfortunatly I can't really test it at it's full potential because it
> >uses glibc's default POSIX AIO which is *lame*. No more than one
> >outstanding request per fd which for PostgreSQL is crappy. There was
> >
> I had the impression from the kernel aio mailing list a while back
> that post-<some kernel version> linux, the POSIX aio calls were
> forwarded to the kernel aio interface. Or are you saying that the
> POSIX API itself imposes that limitation ?
By default when you use aio you get the version in libc (-lrt IIRC)
which has the issue I mentioned, probably because it's probably
optimised for the lots-of-network-connections type program where
multiple outstanding requests on a single fd are not meaningful. You
can however link in some other library which gives you kernel support.
However, I don't have a new enough kernel to have the kernel support so
I havn't tested that.
POSIX AIO doesn't prescribe either way.
Have a nice day,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.
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