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@svana.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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