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From: Heikki Linnakangas <[email protected]>
To: KONDO Mitsumasa <[email protected]>
Cc: Robert Haas <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Subject: Re: Improvement of checkpoint IO scheduler for stable transaction responses
Date: Wed, 26 Jun 2013 14:15:59 +0300
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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On 26.06.2013 11:37, KONDO Mitsumasa wrote:
>>> On Tue, Jun 25, 2013 at 1:15 PM, Heikki Linnakangas
>>>> Hmm, so the write patch doesn't do much, but the fsync patch makes
>>>> the response
>>>> times somewhat smoother. I'd suggest that we drop the write patch
>>>> for now, and focus on the fsyncs.
>
> Write patch is effective in TPS!

Your test results don't agree with that. You got 3465.96 TPS with the 
write patch, and 3474.62 and 3469.03 without it. The fsync+write 
combination got slightly more TPS than just the fsync patch, but only by 
about 1%, and then the response times were worse.

- Heikki


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