Martijn, On 10/15/06 10:56 AM, "Martijn van Oosterhout" <kleptog@svana.org> wrote:
> Have enough systems actually got to the point of actually supporting > async I/O that it's worth implementing? I think there are enough high end applications / systems that need it at this point. The killer use-case we've identified is for the scattered I/O associated with index + heap scans in Postgres. If we can issue ~5-15 I/Os in advance when the TIDs are widely separated it has the potential to increase the I/O speed by the number of disks in the tablespace being scanned. At this point, that pattern will only use one disk. - Luke ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly