Re: Script to compute random page cost
| От | Oliver Elphick |
|---|---|
| Тема | Re: Script to compute random page cost |
| Дата | |
| Msg-id | 1031572358.24419.214.camel@linda обсуждение исходный текст |
| Ответ на | Re: Script to compute random page cost (Bruce Momjian <pgman@candle.pha.pa.us>) |
| Список | pgsql-hackers |
On Mon, 2002-09-09 at 07:13, Bruce Momjian wrote: > > OK, turns out that the loop for sequential scan ran fewer times and was > skewing the numbers. I have a new version at: > > ftp://candle.pha.pa.us/pub/postgresql/randcost > > I get _much_ lower numbers now for random_page_cost. > > --------------------------------------------------------------------------- Five successive runs: random_page_cost = 0.947368 random_page_cost = 0.894737 random_page_cost = 0.947368 random_page_cost = 0.894737 random_page_cost = 0.894737 linux 2.4.18 SMP dual Athlon MP 1900+ 512Mb RAM SCSI -- Oliver Elphick Oliver.Elphick@lfix.co.uk Isle of Wight, UK http://www.lfix.co.uk/oliver GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C ======================================== "Submit yourselves therefore to God. Resist the devil, and he will flee fromyou." James 4:7
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