Questions and Answers : Getting started : How to configure the maximum number of tasks and processes in project preferences
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JGZAW

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Message 47538 - Posted: 16 Nov 2022, 21:48:34 UTC

Hello,

I don't know how to configure the maximum number of simultaneous tasks and the max number of CPUs used per single task.

Assuming I have 32GB RAM and 8 CPUs available for this project, what is better for computing efficiency:
- 1 task with 8 CPUs assigned
- 2 tasks with 4 CPUs each
- 4 tasks with 2 CPUs each
- 8 tasks with 1 CPU each

By "computing efficiency" I mean how to setup that to do the best possible job for LHC@home :)

I would appreciate if someone could explain it.
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Crystal Pellet
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Message 47541 - Posted: 17 Nov 2022, 11:43:35 UTC - in response to Message 47538.  

Since you are running ATLAS-tasks only, the best solution IMO for your machine is 2 tasks with 4 CPUs/task.
I'm not sure how your machine will handle this, because you have a special CPU from the 12th generation with 4 Efficiency and 8 Performance cores (the latter with 2 threads each).
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JGZAW

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Message 47542 - Posted: 17 Nov 2022, 15:33:42 UTC

Interesting.
It seems much more complicated than I thought :)

Thank you!
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Toby Broom
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Message 47544 - Posted: 17 Nov 2022, 21:58:58 UTC

I do all tasks with 1 CPU but atlas uses a lot of RAM due issue with how it works on windows.

So with 32 GB of ram you can only run 3 WUs, as CP said you are probably better off to run a few more CPU / WU
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Questions and Answers : Getting started : How to configure the maximum number of tasks and processes in project preferences


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