en Frost
Sent: Sunday, August 30, 2020 3:24 PM
To: Tomas Vondra
Cc: Robert Haas ; Andres Freund ;
Sait Talha Nisanci ; Thomas Munro
; Dmitry Dolgov <9erthali...@gmail.com>; David Steele
; Alvaro Herrera ; pgsql-hackers
Subject: Re: [EXTERNAL] Re: WIP: WAL prefetch (another approach)
Greetings,
* Tomas Vondra (tomas.von...@2ndquadrant.com) wrote:
> On Thu, Aug 27, 2020 at 04:28:54PM -0400, Stephen Frost wrote:
> >* Robert Haas (robertmh...@gmail.com) wrote:
> >>On Thu, Aug 27, 2020 at 2:51 PM Stephen Frost wrote:
> >>> > Hm? At least earlier versions didn't do prefetching for
On Thu, Aug 27, 2020 at 04:28:54PM -0400, Stephen Frost wrote:
Greetings,
* Robert Haas (robertmh...@gmail.com) wrote:
On Thu, Aug 27, 2020 at 2:51 PM Stephen Frost wrote:
> > Hm? At least earlier versions didn't do prefetching for records with an
fpw, and only for subsequent records affectin
Steele ; Andres Freund ; Alvaro
Herrera ; pgsql-hackers
Subject: Re: [EXTERNAL] Re: WIP: WAL prefetch (another approach)
Greetings,
* Sait Talha Nisanci (sait.nisa...@microsoft.com) wrote:
> I have run some benchmarks for this patch. Overall it seems that there is a
> good improvement wi
Greetings,
* Robert Haas (robertmh...@gmail.com) wrote:
> On Thu, Aug 27, 2020 at 2:51 PM Stephen Frost wrote:
> > > Hm? At least earlier versions didn't do prefetching for records with an
> > > fpw, and only for subsequent records affecting the same or if not in s_b
> > > anymore.
> >
> > We d
On Thu, Aug 27, 2020 at 2:51 PM Stephen Frost wrote:
> > Hm? At least earlier versions didn't do prefetching for records with an
> > fpw, and only for subsequent records affecting the same or if not in s_b
> > anymore.
>
> We don't actually read the page when we're replaying an FPW though..?
> I
Greetings,
* Andres Freund (and...@anarazel.de) wrote:
> On August 27, 2020 11:26:42 AM PDT, Stephen Frost wrote:
> >Is WAL FPW compression enabled..? I'm trying to figure out how, given
> >what's been shared here, that replaying 25GB of WAL is being helped out
> >by 2.5x thanks to prefetch in t
Hi,
On August 27, 2020 11:26:42 AM PDT, Stephen Frost wrote:
>Is WAL FPW compression enabled..? I'm trying to figure out how, given
>what's been shared here, that replaying 25GB of WAL is being helped out
>by 2.5x thanks to prefetch in the SSD case. That prefetch is hurting
>in
>the HDD case e
Greetings,
* Sait Talha Nisanci (sait.nisa...@microsoft.com) wrote:
> OS version is Ubuntu 18.04.5 LTS.
> Filesystem is ext4 and block size is 4KB.
[...]
* Sait Talha Nisanci (sait.nisa...@microsoft.com) wrote:
> I have run some benchmarks for this patch. Overall it seems that there is a
> good
Greetings,
* Sait Talha Nisanci (sait.nisa...@microsoft.com) wrote:
> I have run some benchmarks for this patch. Overall it seems that there is a
> good improvement with the patch on recovery times:
Maybe I missed it somewhere, but what's the OS/filesystem being used
here..? What's the filesyst
On Wed, Aug 26, 2020 at 9:42 AM Sait Talha Nisanci
wrote:
> I have tried combination of SSD, HDD, full_page_writes = on/off and
> max_io_concurrency = 10/50, the recovery times are as follows (in seconds):
>
>No prefetch | Default prefetch
> values |
;;
David Steele ; Andres Freund ; Alvaro
Herrera ; pgsql-hackers
Subject: [EXTERNAL] Re: WIP: WAL prefetch (another approach)
On Thu, Aug 6, 2020 at 10:47 PM Tomas Vondra
wrote:
> On Thu, Aug 06, 2020 at 02:58:44PM +1200, Thomas Munro wrote:
> >On Tue, Aug 4, 2020 at 3:47 AM Tomas Vo
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