| From: | David Rowley <dgrowleyml(at)gmail(dot)com> |
|---|---|
| To: | John Naylor <john(dot)naylor(at)enterprisedb(dot)com> |
| Cc: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers(at)postgresql(dot)org, Tomas Vondra <tv(at)fuzzy(dot)cz> |
| Subject: | Re: slab allocator performance issues |
| Date: | 2022-12-20 08:51:37 |
| Message-ID: | CAApHDvrOcKANJ--VNLDzKFqbVvvO2fdpJQrpSALkBkUDqdxJ5A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, 20 Dec 2022 at 21:19, John Naylor <john(dot)naylor(at)enterprisedb(dot)com> wrote:
>
>
> On Tue, Dec 20, 2022 at 10:36 AM David Rowley <dgrowleyml(at)gmail(dot)com> wrote:
> >
> > I'm planning on pushing the attached v3 patch shortly. I've spent
> > several days reading over this and testing it in detail along with
> > adding additional features to the SlabCheck code to find more
> > inconsistencies.
>
> FWIW, I reran my test from last week and got similar results.
Thanks a lot for testing that stuff last week. I got a bit engrossed
in the perf weirdness and forgot to reply. I found they made much
more sense after using palloc0 and touching the allocated memory just
before freeing. I think this is a more realistic test.
I've now pushed the patch after making a small adjustment to the
version I sent earlier.
David
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