Just out of interest: can you run

    perf stat yourprog

(depending on your setup that may need root or a temporary adjustment of the paranoid setting) on both machines and share the results - just to know what we're actually talking about...

Simon

Am 10.02.2025 um 11:02 schrieb Lev Yudalevich:
The program being tested is not single-threaded. In fact, it is "extremely" multi-threaded. That's why I was expecting faster runs.

On Mon, 10 Feb 2025 at 11:54, David Faure <fa...@kde.org <mailto:fa...@kde.org>> wrote:

    On Monday, 10 February 2025 09:44:39 Lev Yudalevich wrote:
     > My first PC has i7-6700K @ 4.00GHz x 8 CPU, 32GiB RAM
     > My second PC has i7-10700 @ 2.90GHz x 16 CPU, 64GiB RAM
     > Both machines have identical OS installation (Ubuntu 22.04.5 LTS)
    rest of
     > the software (toolchains etc).
     > However, running Valgrind (version 3.25.0.GIT) with the same test
    program
     > on a second (presumably more powerful) machine is more than twice
    slower
     > than running the same on the first machine. What can be a reason
    for this?
     > I'd really appreciate any hint/help/idea. Thank you. Lev.

    2.9 GHz < 4.0 GHz so it seems to me the second PC has a slower CPU.
    Assuming that the program is single-threaded, this explains why the
    second
    machine is actually slower.

-- David Faure, fa...@kde.org <mailto:fa...@kde.org>, http://
    www.davidfaure.fr <http://www.davidfaure.fr>



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