Re: [HACKERS] Bgwriter behavior

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Simon Riggs <simon(at)2ndquadrant(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Gavin Sherry <swm(at)linuxworld(dot)com(dot)au>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, pgsql-patches(at)postgresql(dot)org
Subject: Re: [HACKERS] Bgwriter behavior
Date: 2005-01-07 05:17:41
Message-ID: 200501070517.j075Hfw27917@candle.pha.pa.us
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Do we want to add this additional log infor to CVS for 8.0?

---------------------------------------------------------------------------

Simon Riggs wrote:
> On Mon, 2005-01-03 at 19:14 -0500, Bruce Momjian wrote:
> > Simon Riggs wrote:
> > > Here's my bgwriter instrumentation patch, which gives info that could
> > > allow the bgwriter settings to be tuned.
> >
> > Uh, what does this do exactly? Add additional logging output?
> >
>
> Produces output like this...
>
> DEBUG:ARC T1target= 45 B1len= 4954 T1len= 40 T2len= 4960 B2len= 46
> DEBUG:ARC total = 98% B1hit= 0% T1hit= 0% T2hit= 98% B2hit= 0%
> DEBUG:ARC buffer dirty misses= 22% (wasted= 0); cleaned= 4494
>
> when you have debug_shared_buffers (= n) set
> and you have server messages DEBUG1 available.
>
> The last line of log output has been replaced by this version.
>
> --
> Best Regards, Simon Riggs
>
>
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