Re: Experimental patch for inter-page delay in VACUUM

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Zeugswetter Andreas SB SD" <ZeugswetterA(at)spardat(dot)at>
Cc: "Bruce Momjian" <pgman(at)candle(dot)pha(dot)pa(dot)us>, "Greg Stark" <gsstark(at)mit(dot)edu>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Experimental patch for inter-page delay in VACUUM
Date: 2003-11-10 15:54:53
Message-ID: 26633.1068479693@sss.pgh.pa.us
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"Zeugswetter Andreas SB SD" <ZeugswetterA(at)spardat(dot)at> writes:
> One problem with O_SYNC would be, that the OS does not group writes any
> more. So the code would need to eighter do it's own sorting and grouping
> (256k) or use aio, or you won't be able to get the maximum out of the disks.

Or just run multiple writer processes, which I believe is Oracle's
solution.

regards, tom lane

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