"Stephen" <jleelim(at)xxxxxx(dot)com> writes:
> also as there are less processes waiting to complete. I find a value of 1ms
> to 5ms is quite good and will keep system responsive. Going from 10ms to 1ms
> didn't seem to reduce the total vacuum time by much and I'm not sure why.

On most Unixen, the effective resolution of sleep requests is whatever
the scheduler time quantum is --- and 10ms is the standard quantum in
most cases.  So any delay less than 10ms is going to be interpreted as
10ms.

I think on recent Linuxen it's possible to adjust the time quantum, but
whether this would be a net win isn't clear; presumably a shorter
quantum would result in more scheduler overhead and more process-swap
penalties.

			regards, tom lane

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• Re: Experimental patch for inter-page delay in VACUUM at 2003-10-31 21:20:42 from Stephen

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• Re: Experimental patch for inter-page delay in VACUUM at 2003-11-02 05:45:08 from Stephen

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