Number of cores used by a simulation

[kwasiaddo]

Is there a way to allow mfix to use all the cores that are available locally? I have 4 cores available locally and mfix only uses 1.

[kececi.ahmet]

SMP and DMP are not supported on Windows. Look at these topics which I added below

Enable parallell in windows

I have the options disabled for smp, I would like to know how to enable all my cores (I have 12 available and the box only marks 1) can you help me? I am a newbie in the use of command lines [image]

Parallel run in MFiX-TFM simulation

Do you mean that I can use DMP and SMP if I have necessary compilers in my computer even though my system is window based?

[wuming]

can it run on the virtual machine installed in WIN7 operation system?

[kwasiaddo]

I was actually able to get it use all the available power on my personal machine by editing the mfx file directly. At the very end there is a line that says: #!MFIX-GUI OMP_NUM_THREADS = 1. When i change the number of threads it actually starts using all the cores available.

[onlyjus]

That is interesting. On Windows? Did you build the solver with SMP?

[kwasiaddo]

Yes. Here is what happens when i run the simulations now

[kececi.ahmet]

Is this just a display option (like a pseudo-change) or was it working with all cores?

[wuming]

If the solver is not built for parallel computation, i think it is impossible to run with all cores available. If it is so easy to employ all cores by changing a parameter, why do we need to build a solver for parallel computation.

[onlyjus]

Correct, the default solver is not built with MPI or OpenMP so it will not run in parallel. You need to build a custom solver with the correct libraries (OpenMPI) for the solver to run in parallel.