[cfMesh] How to run CfMesh in parallel?

Carlo_P · June 27, 2019, 05:41

Dear all,

I'm trying to use CfMesh in parallel.
I'm not an able user of Linux.
Can someone explain me step by step every single command?

I tryed with cartesianMesh, but I have a error:

attempt to run parallel on 1 processor.

Thanks a lot,
Carlo

Krao · June 27, 2019, 07:57

Hi Carlo,

follow this link cfmesh and OMP_NUM_THREADS weirdness

Regards

Carlo_P · June 28, 2019, 05:35

Thanks Krao for the link.
I saw also before it, but I didn't understand where I have to modify OMP_NUM_THREADS .

Should I also decompose the case before?
Thanks a lot,
Carlo

Krao · June 28, 2019, 07:16

Hi Carlo,

Open the terminal and go to the directory in which your mesh is placed. Before running the command cartesianMesh or whichever you would like to run, enter 'bash' and press 'enter'. After this, type for example, 'export OMP_NUM_THREADS=4,4'. Use the system monitor to know, whether the application utilising all the cores. Also, you would see change in total meshing time. I think it is not required to decompose. It is only required to run the application.

Krao

Carlo_P · July 2, 2019, 06:01

Thanks Krao,
your process worked perfectly!
Thanks a lot again,
Carlo

June 27, 2019, 05:41	How to run CfMesh in parallel?	#1
Carlo_P Senior Member Carlo_P Join Date: May 2019 Location: Italy Posts: 176 Rep Power: 7	Dear all, I'm trying to use CfMesh in parallel. I'm not an able user of Linux. Can someone explain me step by step every single command? I tryed with cartesianMesh, but I have a error: attempt to run parallel on 1 processor. Thanks a lot, Carlo

June 28, 2019, 07:16		#4
Krao Senior Member Kmeti Rao Join Date: May 2019 Posts: 145 Rep Power: 8	Hi Carlo, Open the terminal and go to the directory in which your mesh is placed. Before running the command cartesianMesh or whichever you would like to run, enter 'bash' and press 'enter'. After this, type for example, 'export OMP_NUM_THREADS=4,4'. Use the system monitor to know, whether the application utilising all the cores. Also, you would see change in total meshing time. I think it is not required to decompose. It is only required to run the application. Krao lukasf likes this.

July 2, 2019, 06:01		#5
Carlo_P Senior Member Carlo_P Join Date: May 2019 Location: Italy Posts: 176 Rep Power: 7	Thanks Krao, your process worked perfectly! Thanks a lot again, Carlo Krao likes this.

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June 27, 2019, 07:57		#2
Krao Senior Member Kmeti Rao Join Date: May 2019 Posts: 145 Rep Power: 8	Hi Carlo, follow this link cfmesh and OMP_NUM_THREADS weirdness Regards

June 28, 2019, 05:35		#3
Carlo_P Senior Member Carlo_P Join Date: May 2019 Location: Italy Posts: 176 Rep Power: 7	Thanks Krao for the link. I saw also before it, but I didn't understand where I have to modify OMP_NUM_THREADS . Should I also decompose the case before? Thanks a lot, Carlo