# Slow MUMPS on 3D thermal parallel problem **URL:** \ **Category:** General Discussion\ **Created:** [March 6, 2024, 9:08am UTC](https://community.freefem.org/t/slow-mumps-on-3d-thermal-parallel-problem/3014 "2024-03-06T09:08:53Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![Timothee99](https://avatars.discourse-cdn.com/v4/letter/t/dec6dc/32.png) [@Timothee99](https://community.freefem.org/u/Timothee99)\ **Post date:** [March 7, 2024, 10:21am UTC](https://community.freefem.org/t/slow-mumps-on-3d-thermal-parallel-problem/3014/7 "2024-03-07T10:21:17Z")
Thank you for all your answers ! I finally found the origin of my problem. It was due to a different version of mpirun (there is a specific version for my machine) so it leads to a problem similar to [https://community.freefem.org/t/windows-cannot-run-ff-mpirun/104/4](https://community.freefem.org/t/windows-cannot-run-ff-mpirun/104/4) which lead to the execution of copies of my program and not the “true” parallel used of the different processor (as mentionned by @cmd ). I obtain now the same execution time as your machine for the MUMPS solver @prj . For now I do not require a more sophisticated or complex parallel solving system (I am already glad to see my program correctly running) but if I need to explore more in depth the field of parallel calculation, I will be happy to have your expertise @prj. Thank you again ! --- _[View the full topic](https://community.freefem.org/t/slow-mumps-on-3d-thermal-parallel-problem/3014)._