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From: Tomas Vondra <tomas.vondra@enterprisedb.com>
To: Simon Riggs <simon.riggs@enterprisedb.com>
To: Thomas Munro <thomas.munro@gmail.com>
Cc: Julien Rouhaud <rjuju123@gmail.com>
Cc: Ashutosh Sharma <ashu.coek88@gmail.com>
Cc: Daniel Gustafsson <daniel@yesql.se>
Cc: Stephen Frost <sfrost@snowman.net>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: David Steele <david@pgmasters.net>
Cc: Dmitry Dolgov <9erthalion6@gmail.com>
Cc: Jakub Wartak <Jakub.Wartak@tomtom.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: WIP: WAL prefetch (another approach)
Date: Tue, 12 Apr 2022 17:41:00 +0200
Message-ID: <03cf0942-662b-8ef5-90e4-b8182f2e1b8d@enterprisedb.com> (raw)
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	<CA+hUKGKusWunqOd9En+FkT+US_kuDK-MSZyXHCr=OTwRw8Ah1A@mail.gmail.com>
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	<CANbhV-FsVOXou11teGwPWiHh__yaDUSTG6K2JPRTHgznt2uvpg@mail.gmail.com>

On 4/12/22 15:58, Simon Riggs wrote:
> On Thu, 7 Apr 2022 at 08:46, Thomas Munro <thomas.munro@gmail.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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