Running Mumax3 on multi-GPU

[Charudatta Phatak]

Hi,

I was wondering if the current version of mumax (mumax3.10_linux_cuda11.0) supports running on multiple GPUs? I am trying to run it on the new Nvidia A100 node which has 8 GPUs associated with it. Does mumax run in a distributed mode automatically or are there any specific flags that need to be added?

Thank you for you help in advance!

cheers,

-cd

[Josh Lauzier]

Hello,

Yes, mumax comes with the ability to distribute jobs (you can only use 1 GPU per simulation). You can specify a particular gpu with the gpu flag, as well.

Some additional capability is given with the mumax3-server package for clusters, which may be useful for you. It has the ability to schedule/queue jobs etc.

Best,

Josh L

[Felipe Garcia]

Hi Charudatta Phatak,

One can use each GPU for a different calculation. I think it is not possible to do real distributed calculations of a single script. As Josh Lauzier mentioned it is possible to do a kind of batch system with mumax3-server. The other option is to use

mumax3 script1.txt script2.txt ... scriptn.txt

This will automatically distribute the script between the GPUs until all the scripts are finalized. It will occupy all the available GPU even if there is another mumax3 script running.

Best regards,

Felipe

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[Charudatta Phatak]

Thank you, Felipe and Josh L for your answers. That is quite helpful. 

cheers,

-cd

[Myles J]

Hi CD:

How large are your problems (in terms of grid-size) and how long does it take to run on one gpu (time to solution)?  A single gpu can handle a lot of work (almost 100x of a regular cpu core) - so unless you have a very large problem, running on multiple gpu cores might not be necessary for a single problem.

Myles