With the same code in Mumax3, when performing multiple tasks, the results are different each time.

[XBob]

Hello,everyone!

When I run multiple Mumax3 programs simultaneously on the host computer and when I run a single Mumax3 program, the same code yields significantly different results. The code I used is shown in the figure. Sometimes the three grains flip together, and sometimes one grain flips first, followed by the flipping of the other two grains. Why is this happening? Could it be due to the GPU computing power as some people suggest?

[Jonathan Leliaert]

Which mumax version did you run your simulations with? 

Your results might be affected by this bug: https://github.com/mumax/3/pull/372

Can you try again with the latest mumax version and see if the problem persists?

Best,

Jonathan

On Wed, Mar 18, 2026 at 2:59 AM 'XBob' via mumax2 <mum...@googlegroups.com> wrote:

Hello,everyone!

When I run multiple Mumax3 programs simultaneously on the host computer and when I run a single Mumax3 program, the same code yields significantly different results. The code I used is shown in the figure. Sometimes the three grains flip together, and sometimes one grain flips first, followed by the flipping of the other two grains. Why is this happening? Could it be due to the GPU computing power as some people suggest?

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