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Ansys Learning Forum › Forums › Discuss Simulation › LS Dyna › DMP not working › Reply To: DMP not working

August 8, 2024 at 10:50 pm
Reno Genest
Ansys Employee

Hello Javat,

SMP does not scale well beyond about 8 cores. So, you should not see a speedup beyond 8 cores and you may actually see speed degradation with more cores.

When you activate DMP, the MPP version of LS-DYNA is used (as opposed to SMP). MPP will scale well beyond 8 cores and it is the solver to use to utilize all your cores.

With MPP LS-DYNA you get mesXXXX files. For example, if you run on 24 cores, you will get mes0000 - mes0023 files in the working directory and the error message can be found in one or many mesXXXX files. So, you have to look at all the mesXXXX to find a meaningful error message. You can also use the following webapp to save time and extract error messages from mesXXXX automatically:

https://nagasairam112-check-dyna-errors-error-dyna-check-rq20je.streamlit.app/

 

Hopefully, you will extract a proper error message that will help you troubleshoot the problem.

You will find more information on SMP and MPP LS-DYNA here:

Microsoft PowerPoint - mpp_201305 (lstc.com)

 

Let me know how it goes.

 

Reno.