Re: [HACKERS] include/config.h FOLLOWUP
От | Bruce Momjian |
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Тема | Re: [HACKERS] include/config.h FOLLOWUP |
Дата | |
Msg-id | 199801041905.OAA04251@candle.pha.pa.us обсуждение исходный текст |
Ответ на | Re: [HACKERS] include/config.h FOLLOWUP (The Hermit Hacker <scrappy@hub.org>) |
Ответы |
Re: [HACKERS] include/config.h FOLLOWUP
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Список | pgsql-hackers |
> No, don't make it a run-time or auto-detect thing, just a compile time > option. By default, leave it at 8192, since "that's the way its always been"... > but if we are justifying it based on disk block size, its 2x the disk block > size that my system is setup for. What's the difference between that and making > it 3x or 4x? Or, hell, would I get a performance increase if I brought it > down to 4096, which is what my actually disk block size is? > > So, what we would really be doing is setting the default to 8192, but give > the installer the opportunity (with a caveat that this value should be a multiple > of default file system block size for optimal performance) to increase it as they > see fit. I assume you changed the default, becuase the BSD44 default is 8k blocks, with 1k fragments. I don't think there is any 'performance' improvement with making it greater than the file system block size. -- Bruce Momjian maillist@candle.pha.pa.us
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