Re: [HACKERS] Sequential scan speed, mmap, disk i/o
От | Thomas G. Lockhart |
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Тема | Re: [HACKERS] Sequential scan speed, mmap, disk i/o |
Дата | |
Msg-id | 355CFC8E.91BF31DF@alumni.caltech.edu обсуждение исходный текст |
Ответ на | Re: [HACKERS] Sequential scan speed, mmap, disk i/o (Bruce Momjian <maillist@candle.pha.pa.us>) |
Ответы |
Re: [HACKERS] Sequential scan speed, mmap, disk i/o
Re: [HACKERS] Sequential scan speed, mmap, disk i/o |
Список | pgsql-hackers |
> Basically, Linux is double my speed for 8k mmap'ed chunks. Around 32k > chunks, I get closer, and 8mb chunks are the same. Glad to hear Linux > has optimized mmap() recently, because BSD/OS looks much slower than > Linux on this. Well Bruce, don't be too happy. Most people aren't yet running the optimized kernel; don't know if any of the benchmarks came from someone running a bleeding-edge development version, which is what 2.1.99 would be; first feature-freeze release in preparation for v2.2 afaik :) And scrappy, no need to note that _all_ Linux kernels are bleeding edge releases :) - Tom (from his Linux box...)
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