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Re: [PERFORM] [HACKERS] More benchmarking of wal_buffers

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Kevin Brown <kevin(at)sysexperts(dot)com>
Cc: Hackers <pgsql-hackers(at)postgresql(dot)org>,pgsql-performance(at)postgresql(dot)org,Advocacy <pgsql-advocacy(at)postgresql(dot)org>
Subject: Re: [PERFORM] [HACKERS] More benchmarking of wal_buffers
Date: 2003-02-14 04:14:49
Message-ID: 3914.1045196089@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-advocacypgsql-hackerspgsql-performance
Kevin Brown <kevin(at)sysexperts(dot)com> writes:
> What happens when the only transaction running emits more WAL log data
> than wal_buffers can handle?  A flush happens when the WAL buffers
> fill up (that's what I'd expect)?  Didn't find much in the
> documentation about it...

A write, not a flush (ie, we don't force an fsync).  Also, I think it
writes only a few blocks, not all the available data.  Don't recall the
details on that.

			regards, tom lane

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