| From: | John Naylor <john(dot)naylor(at)enterprisedb(dot)com> |
|---|---|
| To: | David Rowley <dgrowleyml(at)gmail(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Jakub Wartak <jakub(dot)wartak(at)enterprisedb(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Peter Eisentraut <peter(at)eisentraut(dot)org>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Performance degradation on concurrent COPY into a single relation in PG16. |
| Date: | 2023-07-31 09:39:04 |
| Message-ID: | CAFBsxsF7GdxNbEeiRpTBBuiDBnyMH6d_HMehtZUZYZmdP2Tcqg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Jul 27, 2023 at 7:17 AM David Rowley <dgrowleyml(at)gmail(dot)com> wrote:
>
> It would be really good if someone with another a newish intel CPU
> could test this too.
I ran the lotsaints test from last email on an i7-10750H (~3 years old) and
got these results (gcc 13.1 , turbo off):
REL_15_STABLE:
latency average = 956.453 ms
latency stddev = 4.854 ms
REL_16_STABLE @ 695f5deb7902 (28-JUL-2023):
latency average = 999.354 ms
latency stddev = 3.611 ms
master @ 39055cb4cc (31-JUL-2023):
latency average = 995.310 ms
latency stddev = 5.176 ms
master + revert c1308ce2d (the replace-palloc0 fix)
latency average = 1080.909 ms
latency stddev = 8.707 ms
master + pg_strtoint_fastpath1.patch
latency average = 938.146 ms
latency stddev = 9.354 ms
master + pg_strtoint_fastpath2.patch
latency average = 902.808 ms
latency stddev = 3.957 ms
For me, PG16 seems to regress from PG15, and the second patch seems faster
than the first.
--
John Naylor
EDB: http://www.enterprisedb.com
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