Sure. Here we go:
perf stat on first PC (i7-6700K @ 4.00GHz x 8 CPU, 32GiB RAM):
395,282.24 msec task-clock # 5.612 CPUs
utilized
4,982,318 context-switches # 12.604 K/sec
1,258,234 cpu-migrations # 3.183 K/sec
1,698,192 page-faults # 4.296 K/sec
1,558,005,376,132 cycles # 3.942 GHz
1,085,678,118,192 instructions # 0.70 insn
per cycle
130,242,817,239 branches # 329.493 M/sec
1,513,065,695 branch-misses # 1.16% of all
branches
70.439261508 seconds time elapsed
351.168298000 seconds user
44.239862000 seconds sys
perf stat on second PC (i7-10700 @ 2.90GHz x 16 CPU, 64GiB RAM):
277,595.50 msec task-clock # 8.502 CPUs
utilized
3,356,252 context-switches # 12.090 K/sec
872,020 cpu-migrations # 3.141 K/sec
1,671,597 page-faults # 6.022 K/sec
1,257,017,696,457 cycles # 4.528 GHz
590,118,043,095 instructions # 0.47 insn
per cycle
70,240,995,962 branches # 253.034 M/sec
734,712,605 branch-misses # 1.05% of all
branches
32.651035006 seconds time elapsed
254.315463000 seconds user
23.384174000 seconds sys
On Mon, 10 Feb 2025 at 13:26, Simon Sobisch <[email protected]> wrote:
> 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 <[email protected]
> > <mailto:[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] <mailto:[email protected]>, http://
> > www.davidfaure.fr <http://www.davidfaure.fr>
> >
> >
> >
> > _______________________________________________
> > Valgrind-users mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/valgrind-users
>
>
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