Re: Wrong docs on checkpoint_segments?

From: Andres Freund <andres(at)anarazel(dot)de>
To: pgsql-performance(at)postgresql(dot)org
Cc: Florian Weimer <fweimer(at)bfk(dot)de>
Subject: Re: Wrong docs on checkpoint_segments?
Date: 2011-01-07 13:39:31
Message-ID: 201101071439.32053.andres@anarazel.de
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On Friday, January 07, 2011 01:45:25 PM Florian Weimer wrote:
> On 9.0, this configuration
>
> checkpoint_segments = 512 # in logfile segments, min 1, 16MB each
>
> results in 1034 segments, so the effective logfile segment size is 32 MB.
Um. Is it possible that you redefined XLOG_SEG_SIZE or used --with-wal-
segsize=SEGSIZE?

The default is still:
andres(at)alap2:~/src/postgresql$ grep XLOG_SEG_SIZE src/include/pg_config.h
/* XLOG_SEG_SIZE is the size of a single WAL file. This must be a power of 2
XLOG_BLCKSZ). Changing XLOG_SEG_SIZE requires an initdb. */
#define XLOG_SEG_SIZE (16 * 1024 * 1024)

Andres

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