From: | David Boreham <david_list(at)boreham(dot)org> |
---|---|
To: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: ice-broker scan thread |
Date: | 2005-11-29 17:28:57 |
Message-ID: | 438C8FD9.3090302@boreham.org |
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Thread: | |
Lists: | pgsql-hackers |
>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.
>
>
Actually, after reading up on the current state of things, I'm not sure you
can even get POSIX aio on top of kernel aio in Linux. There are also a
few limitations in the 2.6 aio implementation that might prove troublesome:
for example it only works with O_DIRECT.
libaio gives userland access to the kernel aio api (which is different
from POSIX aio).
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