Re: Misaligned BufferDescriptors causing major performance problems on AMD

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Andres Freund <andres(at)2ndquadrant(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Greg Stark <stark(at)mit(dot)edu>, Peter Geoghegan <pg(at)heroku(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Misaligned BufferDescriptors causing major performance problems on AMD
Date: 2015-01-06 02:43:04
Message-ID: 20150106024304.GA13684@momjian.us
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On Fri, Jan 2, 2015 at 06:25:52PM +0100, Andres Freund wrote:
> I can't run tests right now...
>
> What exactly do you want to see with these tests? that's essentially
> what I've already benchmarked + some fprintfs?

I want to test two patches that both allocate an extra 64 bytes but
shift the alignment of just the buffer descriptor memory allocation.

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

+ Everyone has their own god. +

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