On 10-02-25 09:44, 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.
Any patches to speed up Valgrind would be welcome ;-)
Seriously, one common mistake that I often see new users make is
overdoing it with the Valgrind options. Just because Valgrind has many
options doesn't mean that you should use them all. As a rule the more
options you add the slower Valgrind will run.
I'm going to assume that it's memcheck that you are using.
If you're just running tests
----------------------------
Really minimise your use of options. You may need --trace-children=yes
(and possibly --trace-children-skip= if your exe forks a lot of other
processes), Don't check for leaks unless the leak summary says that you
have leaks. Don't use --track-origins=yes until you have detected a
"Conditional jump" error.
If you know you have an error and you want to debug it
------------------------------------------------------
This is where you want to start turning on options like
--track-origins=yes and --read-var-info=yes.
A+
Paul
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