Re: Change default of checkpoint_completion_target

From: Stephen Frost <sfrost(at)snowman(dot)net>
To: Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>
Cc: Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, "Bossart, Nathan" <bossartn(at)amazon(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Bernd Helmle <mailings(at)oopsware(dot)de>, "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Change default of checkpoint_completion_target
Date: 2021-01-19 19:14:50
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* Peter Eisentraut (peter(dot)eisentraut(at)enterprisedb(dot)com) wrote:
> On 2021-01-13 23:10, Stephen Frost wrote:
> >>Yes, I agree, and am involved in that thread as well- currently waiting
> >>feedback from others about the proposed approach.
> >I've tried to push that forward. I'm happy to update this patch once
> >we've got agreement to move forward on that, to wit, adding to an
> >'obsolete' section in the documentation information about this
> >particular GUC and how it's been removed due to not being sensible or
> >necessary to continue to have.
> Some discussion a few days ago was arguing that it was still necessary in
> some cases as a way to counteract the possible lack of tuning in the kernel
> flushing behavior. I think in light of that we should go with your first
> patch that just changes the default, possibly with the documentation updated
> a bit.

Rebased and updated patch attached which moves back to just changing the
default instead of removing the option, with a more explicit call-out of
the '90%', as suggested by Michael on the other patch.

Any further comments or thoughts on this one?



Attachment Content-Type Size
cct_def_v3.patch text/x-diff 6.7 KB

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