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Re: testing HS/SR - 1 vs 2 performance

From: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
To: Erik Rijkers <er(at)xs4all(dot)nl>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: testing HS/SR - 1 vs 2 performance
Date: 2010-04-12 09:06:21
Message-ID: m2j3f0b79eb1004120206i3de076f7j5efcdabcb353c73b@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Sat, Apr 10, 2010 at 8:23 AM, Erik Rijkers <er(at)xs4all(dot)nl> wrote:
> I understand that in the scale=1000 case, there is a huge
> cache effect, but why doesn't that apply to the pgbench runs
> against the standby?  (and for the scale=10_000 case the
> differences are still rather large)

I guess that this performance degradation happened because a number of
buffer replacements caused UpdateMinRecoveryPoint() often. So I think
increasing shared_buffers would improve the performance significantly.

Regards,

-- 
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center

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