Re: Performance Improvement by reducing WAL for Update Operation

From: Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>
To: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Mike Blackwell <mike(dot)blackwell(at)rrd(dot)com>
Subject: Re: Performance Improvement by reducing WAL for Update Operation
Date: 2014-02-05 15:20:55
Message-ID: 52F256D7.2070509@vmware.com
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On 02/05/2014 04:48 PM, Amit Kapila wrote:
> I have done one test where there is a large suffix match, but
> not large enough that it can compress more than 75% of string,
> the CPU overhead with wal-update-prefix-suffix-encode-1.patch is
> not much, but there is no I/O reduction as well.

Hmm, it's supposed to compress if you save at least 25%, not 75%.
Apparently I got that backwards in the patch...

- Heikki

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