Re: Valgrind runs way slower on faster PC

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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 <[email protected]> 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, [email protected], http://www.davidfaure.fr
>

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<div dir=3D"ltr">The program being tested is not single-threaded. In fact, =
it is &quot;extremely&quot; multi-threaded. That&#39;s why I was expecting =
faster runs.</div><br><div class=3D"gmail_quote gmail_quote_container"><div=
 dir=3D"ltr" class=3D"gmail_attr">On Mon, 10 Feb 2025 at 11:54, David Faure=
 &lt;<a href=3D"mailto:[email protected]">[email protected]</a>&gt; wrote:<br></div=
><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border=
-left:1px solid rgb(204,204,204);padding-left:1ex">On Monday, 10 February 2=
025 09:44:39 Lev Yudalevich wrote:<br>
&gt; My first PC has i7-6700K @ 4.00GHz x 8 CPU, 32GiB RAM<br>
&gt; My second PC has i7-10700 @ 2.90GHz x 16 CPU, 64GiB RAM<br>
&gt; Both machines have identical OS installation (Ubuntu 22.04.5 LTS) rest=
 of<br>
&gt; the software (toolchains etc).<br>
&gt; However, running Valgrind (version 3.25.0.GIT) with the same test prog=
ram<br>
&gt; on a second (presumably more powerful) machine is more than twice slow=
er<br>
&gt; than running the same on the first machine. What can be a reason for t=
his?<br>
&gt; I&#39;d really appreciate any hint/help/idea. Thank you. Lev.<br>
<br>
2.9 GHz &lt; 4.0 GHz so it seems to me the second PC has a slower CPU.<br>
Assuming that the program is single-threaded, this explains why the second =
<br>
machine is actually slower.<br>
<br>
-- <br>
David Faure, <a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]=
rg</a>, <a href=3D"http://www.davidfaure.fr" rel=3D"noreferrer" target=3D"_=
blank">http://www.davidfaure.fr</a><br>
</blockquote></div>

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