Re: WIP: WAL prefetch (another approach)

From: Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>
To: Simon Riggs <simon(dot)riggs(at)enterprisedb(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
Cc: Julien Rouhaud <rjuju123(at)gmail(dot)com>, Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com>, Daniel Gustafsson <daniel(at)yesql(dot)se>, Stephen Frost <sfrost(at)snowman(dot)net>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, David Steele <david(at)pgmasters(dot)net>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Jakub Wartak <Jakub(dot)Wartak(at)tomtom(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: WIP: WAL prefetch (another approach)
Date: 2022-04-12 15:41:00
Message-ID: 03cf0942-662b-8ef5-90e4-b8182f2e1b8d@enterprisedb.com
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On 4/12/22 15:58, Simon Riggs wrote:
> On Thu, 7 Apr 2022 at 08:46, Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
>
>> With that... I've finally pushed the 0002 patch and will be watching
>> the build farm.
>
> This is a nice feature if it is safe to turn off full_page_writes.
>
> When is it safe to do that? On which platform?
>
> I am not aware of any released software that allows full_page_writes
> to be safely disabled. Perhaps something has been released recently
> that allows this? I think we have substantial documentation about
> safety of other settings, so we should carefully document things here
> also.
>

I don't see why/how would an async prefetch make FPW unnecessary. Did
anyone claim that be the case?

regards

--
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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