Re: Which qsort is used
От | Qingqing Zhou |
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Тема | Re: Which qsort is used |
Дата | |
Msg-id | Pine.LNX.4.58.0512150005240.31297@josh.db обсуждение исходный текст |
Ответ на | Re: Which qsort is used ("Luke Lonergan" <llonergan@greenplum.com>) |
Ответы |
Re: Which qsort is used
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Список | pgsql-hackers |
On Wed, 14 Dec 2005, Luke Lonergan wrote: > > Overall - I'd say that the BSD routine is showing the best overall results > when the scale test is included. The qsortG routine has some significantly > better performance in certain cases at smaller sort set sizes - it could > probably be improved for better L2 use, but BSD is already there. > > Based on this it seems like we should expose the option to choose the BSD > qsort routine at configure time. > Before we pin down this, I hope more extensive tests on various platforms could be done. So we could give some suggestions when we should enable the "--enable-bsdqsort" option. I can post a result on a SunOS machine (but the problem is that many ppl share this machine) and a windows machine. Regards, Qingqing
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