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Solve time

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2 years 4 months ago - 2 years 4 months ago #4110 by NV
Solve time was created by NV
Hello Everyone,
I have some problems with the solving speed on my windows computer. The solving procedure is a couple of times slower compared to solving the same solid mechanical problem on my Apple macbook. I cannot imagine this is only due to the hardware setting.
On the windows pc im using:
Code:
ngsolve.solvers.Newton(bfa, solution, inverse="pardiso", dirichletvalues=solution.vec)
On the Macbook I probably did not have to use pardiso but I can't check it anymore.
Do you have ideas why it is so much slower or tips how to solve the problem faster (e.g. use of another sparse solver)?
Last edit: 2 years 4 months ago by NV.
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2 years 4 months ago #4112 by joachim
Replied by joachim on topic Solve time
Hi NV,

check the number running threads. If you use TaskManager from ngsolve, and pardiso/mkl uses multithreading it may happen that you heavily overload you machine. Here an MKL_NUM_THREADS=1 or similar helps.

if your system matrix is symmetric and positive definite, try the ngsolve-internal solver:
Code:
inverse="sparsecholesky"

Joachim
The following user(s) said Thank You: Nils
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2 years 3 months ago #4118 by Nils
Replied by Nils on topic Solve time
Hi Joachim,
as always you helped a lot, thank you very much. It was just the TaskManager() which has not been used and on Windows only a single thread was running.
Wish you all merry Christmas and a good start into 2022.

Best regards,
Nils
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