Re: bgwriter changes - Mailing list pgsql-hackers

From Tom Lane
Subject Re: bgwriter changes
Date
Msg-id 16752.1103053219@sss.pgh.pa.us
Whole thread Raw
In response to Re: bgwriter changes  ("Zeugswetter Andreas DAZ SD" <ZeugswetterA@spardat.at>)
Responses Re: bgwriter changes
Re: bgwriter changes
List pgsql-hackers
"Zeugswetter Andreas DAZ SD" <ZeugswetterA@spardat.at> writes:
> Is it possible to do a patch that produces a dirty buffer list in LRU order
> and stops early when eighter maxpages is reached or bgwriter_percent
> pages are scanned ?

Only if you redefine the meaning of bgwriter_percent.  At present it's
defined by reference to the total number of dirty pages, and that can't
be known without collecting them all.

If it were, say, a percentage of the total length of the T1/T2 lists,
then we'd have some chance of stopping the scan early.
        regards, tom lane


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