Re: [HACKERS] sort on huge table
От | Bruce Momjian |
---|---|
Тема | Re: [HACKERS] sort on huge table |
Дата | |
Msg-id | 199911011913.OAA27394@candle.pha.pa.us обсуждение исходный текст |
Ответ на | Re: [HACKERS] sort on huge table ("Aaron J. Seigo" <aaron@gtv.ca>) |
Список | pgsql-hackers |
> hi... > > > Look what I found. I downloaded Linux kernel source for 2.2.0, and > > started looking for the word 'ahead' in the file system files. I found > > that read-ahead seems to be controlled by f_reada, and look where I > > found it being turned off? Seems like any seek turns off read-ahead on > > Linux. > > the current kernel is 2.2.13... =) I need to know what kernel the tester is using. I doubt it is the most current one. > that said, the fs/ext2/file.c is the same in 2.2.13 as it is in 2.2.0 (just > checked).. i'm going to put this out on the linux kernel mailing list and see > what comes back, though, as this seems to be an issue that should be > resolved if accurate.... I am not sure I am accurate either, but I think I am. It would be nice to get the kernel fixed, though a fix for that is rarely trivial. Let us know what your find out. -- Bruce Momjian | http://www.op.net/~candle maillist@candle.pha.pa.us | (610) 853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania19026
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