Re: [HACKERS] performance test

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От Vadim Mikheev
Тема Re: [HACKERS] performance test
Дата
Msg-id 36A539B7.D34341F0@krs.ru
обсуждение исходный текст
Ответ на performance test  (Michael Meskes <Michael.Meskes@usa.net>)
Список pgsql-hackers
Michael Meskes wrote:
> 
> On Tue, Jan 19, 1999 at 10:27:50AM +0700, Vadim Mikheev wrote:
> > You've seen disadvantages of our unperfect buffer manager -:)
> > When server need in buffer for new data comming and there is
> > no unused buffers in pool (i.e. - all buffers filled with new
> > data and marked as dirty), server gets some dirty buffer,
> > writes it AND FSYNC file. So, server does many fsyncs
> > even with BEGIN/END while should do _one_ fsync at COMMIT.
> >
> > Having this problem fixed you wouldn't had so big difference
> > between -F and BEGIN/END-no-F.
> 
> I see. But without BEGIN/END a huge difference remains to be expected,
> doesn't it?

Of 'course! Two fsync per commit...

Vadim


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