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From: David Geier <geidav.pg@gmail.com>
To: Lukas Fittl <lukas@fittl.com>
To: John Naylor <johncnaylorls@gmail.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: Jakub Wartak <jakub.wartak@enterprisedb.com>
Cc: Hannu Krosing <hannuk@google.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Pavel Stehule <pavel.stehule@gmail.com>
Cc: vignesh C <vignesh21@gmail.com>
Cc: Michael Paquier <michael@paquier.xyz>
Cc: Ibrar Ahmed <ibrar.ahmad@gmail.com>
Cc: Maciek Sakrejda <m.sakrejda@gmail.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: Reduce timing overhead of EXPLAIN ANALYZE using rdtsc?
Date: Mon, 23 Mar 2026 09:00:34 +0100
Message-ID: <94366544-c28a-4895-a2a8-19dc58671623@gmail.com> (raw)
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Hi Lukas!

Thanks for pushing this forward.

On 22.03.2026 19:13, Lukas Fittl wrote:

> TSC calibration improvements:
> - Pass TSC frequency to child processes for EXEC_BACKEND, this makes
> TSC calibration usable on Windows, per off-list suggestion from Andres
> - To support the EXEC_BACKEND change, refactor tsc_frequency_khz to
> have a sentinel value of -1 indicating the TSC was not initialized, vs
> 0 indicating it was initialized but isn't usable, and drop
> has_usable_tsc variable

Have you tested the latest patch set on Windows? Let me know if you want
me to do that.

--
David Geier





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