| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Melanie Plageman <melanieplageman(at)gmail(dot)com>, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, "Drouvot, Bertrand" <bertranddrouvot(dot)pg(at)gmail(dot)com>, Nitin Jadhav <nitinjadhavpostgres(at)gmail(dot)com>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com>, Julien Rouhaud <rjuju123(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Magnus Hagander <magnus(at)hagander(dot)net>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Report checkpoint progress with pg_stat_progress_checkpoint (was: Report checkpoint progress in server logs) |
| Date: | 2022-11-17 17:21:03 |
| Message-ID: | CA+TgmoYdb2mz3NpEhohG+Th6oCmYH0o7+=Zxb6j+AZRXAN9DEg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Nov 17, 2022 at 11:24 AM Andres Freund <andres(at)anarazel(dot)de> wrote:
> As an experiment, I added a progress report to BufferSync()'s first loop
> (i.e. where it checks all buffers). On a 128GB shared_buffers cluster that
> increases the time for a do-nothing checkpoint from ~235ms to ~280ms. If I
> remove the changecount stuff and use a single write + write barrier, it ends
> up as 250ms. Inlining brings it down a bit further, to 247ms.
OK, I'd say that's pretty good evidence that we can't totally
disregard the issue.
--
Robert Haas
EDB: http://www.enterprisedb.com
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