| From: | John Naylor <johncnaylorls(at)gmail(dot)com> |
|---|---|
| To: | Lukas Fittl <lukas(at)fittl(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Jakub Wartak <jakub(dot)wartak(at)enterprisedb(dot)com>, Hannu Krosing <hannuk(at)google(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Ibrar Ahmed <ibrar(dot)ahmad(at)gmail(dot)com>, Maciek Sakrejda <m(dot)sakrejda(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, David Geier <geidav(dot)pg(at)gmail(dot)com> |
| Subject: | Re: Reduce timing overhead of EXPLAIN ANALYZE using rdtsc? |
| Date: | 2026-04-05 02:28:59 |
| Message-ID: | CANWCAZb12Si+6QWYLCxvhHDmP2L4pOqXoTuxtheu0uZ=TLn-Rg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Apr 5, 2026 at 2:00 AM Lukas Fittl <lukas(at)fittl(dot)com> wrote:
>
> On Sat, Apr 4, 2026 at 2:21 AM Lukas Fittl <lukas(at)fittl(dot)com> wrote:
> > See attached v17.
>
> This needed a rebase after 5e13b0f240397b2, see attached v18.
>
> Looking at the changes in that commit, I also ended up re-ordering the
> feature flags in pg_cpu.h, so we have the 128/256/512 bit registers
> first, and then hypervisor and TSC flags after the 512 bit registers.
v18-0002 looks good to me as far as feature-detection, but aside from
that there are plenty of domain-specific details that I lack the means
to check on short notice. I did verify that OSXSAVE support is still
functional.
--
John Naylor
Amazon Web Services
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