| From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)2ndquadrant(dot)com> |
| Cc: | KONDO Mitsumasa <kondo(dot)mitsumasa(at)lab(dot)ntt(dot)co(dot)jp>, Robert Haas <robertmhaas(at)gmail(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Improvement of checkpoint IO scheduler for stable transaction responses |
| Date: | 2013-07-04 15:35:32 |
| Message-ID: | 51D59644.2070005@commandprompt.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On 07/04/2013 06:05 AM, Andres Freund wrote:
>>> Presumably the smaller segsize is better because we don't
>>> completely stall the system by submitting up to 1GB of io at once. So,
>>> if we were to do it in 32MB chunks and then do a final fsync()
>>> afterwards we might get most of the benefits.
>> Yes, I try to test this setting './configure --with-segsize=0.03125' tonight.
>> I will send you this test result tomorrow.
>
I did testing on this a few years ago, I tried with 2MB segments over
16MB thinking similarly to you. It failed miserably, performance
completely tanked.
JD
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