| From: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> |
|---|---|
| To: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
| Cc: | 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: | 2021-11-26 23:34:21 |
| Message-ID: | 1099b5a9-a521-93ad-c551-0cacdac8cef8@enterprisedb.com |
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| Lists: | pgsql-hackers |
On 11/26/21 22:16, Thomas Munro wrote:
> On Fri, Nov 26, 2021 at 11:32 AM Tomas Vondra
> <tomas(dot)vondra(at)enterprisedb(dot)com> wrote:
>> The results are pretty good / similar to previous results. Replaying the
>> 1h worth of work on a smaller machine takes ~5:30h without prefetching
>> (master or with prefetching disabled). With prefetching enabled this
>> drops to ~2h (default config) and ~1h (with tuning).
>
> Thanks for testing! Wow, that's a nice graph.
>
> This has bit-rotted already due to Robert's work on ripping out
> globals, so I'll post a rebase early next week, and incorporate your
> code feedback.
>
One thing that's not clear to me is what happened to the reasons why
this feature was reverted in the PG14 cycle?
regards
--
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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