Re: Perfomance degradation 9.3 (vs 9.2) for FreeBSD

From: Tatsuo Ishii <ishii(at)postgresql(dot)org>
To: andres(at)2ndquadrant(dot)com
Cc: girgen(at)FreeBSD(dot)org, pgsql-hackers(at)postgresql(dot)org, robertmhaas(at)gmail(dot)com, ftigeot(at)wolfpond(dot)org
Subject: Re: Perfomance degradation 9.3 (vs 9.2) for FreeBSD
Date: 2014-07-03 10:15:32
Message-ID: 20140703.191532.933784435488339338.t-ishii@sraoss.co.jp
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Hi,

> Hi,
>
> Attached you can find a short (compile tested only ) patch implementing
> a 'shared_memory_type' GUC, akin to 'dynamic_shared_memory_type'. Will
> only apply to 9.4, not 9.3, but it should be easy to convert for it.
>
> Greetings,
>
> Andres Freund

I have rebased Andres's patch against 9.3-STABLE tree. Please take a
look at attached patches and let me know if you find anything strange.

I am going to test the patch on a huge HP machine: DL980G7/64
cores/2TB mem. With the patch I would be able to report back if using
SysV shared mem fixes the 9.3 performance problem.

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp

Attachment Content-Type Size
0001-Add-shared_memory_type-GUC-9.3.patch text/x-patch 6.8 KB

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