Message boards : Number crunching : Profile settings: Max # of jobs / CPUs for this project?
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Win Prion

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Message 52825 - Posted: 9 Jan 2026, 18:48:15 UTC

I'm having trouble making sense of the two settings in the LHC profile:
-Max # of jobs for this project - current setting = 3
-Max # of CPUs for this project - current setting = 1

I want to run 3 simultaneous tasks, each consuming 1 CPU (thread), What do choose for these two settings?

On my PC I have 4 threads. One thread is split in half to support 2 GPU tasks for another project. LHC is now running a single 4-CPU task (where it got that 4th CPU I don't know ;-). Regardless, I want to run 3 single-cpu tasks.

Thanks.
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Toby Broom
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Message 52827 - Posted: 9 Jan 2026, 19:43:31 UTC - in response to Message 52825.  

I think these settings should work, I mange this locally with an app_config file if you want to do this you can create one with something like this:

<app_config>
<app_version>
<app_name>CMS</app_name>
<plan_class>vbox64_mt_mcore_cms</plan_class>
<avg_ncpus>1.0</avg_ncpus>
<cmdline>--nthreads 1</cmdline>
</app_version>
<app_version>
<app_name>ATLAS</app_name>
<plan_class>vbox64_mt_mcore_atlas</plan_class>
<avg_ncpus>1.0</avg_ncpus>
<cmdline>--nthreads 1</cmdline>
</app_version>
<project_max_concurrent>3</project_max_concurrent>
</app_config>

Theory isn't multicore so no need for that.
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Win Prion

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Message 52830 - Posted: 10 Jan 2026, 0:34:52 UTC - in response to Message 52827.  

Thanks - that worked! I had to comment out the CMS section, but the rest is what I needed.
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Message boards : Number crunching : Profile settings: Max # of jobs / CPUs for this project?


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