parallel calculation on multiple computers

foam_noob · January 13, 2010, 05:12

Hi,

I recenty figured out how to run snappy parallel on multiple computer. The method described in the user guide (Chapter 3) didn't work for me and I stumbled upon the solution by sheer accident. Instead of typing cpu=x after the name of the PCs, I used slots=x.

I tried various methods to execute the command such as:

mpirun --hostfile machines -np 6 snappyHexMesh -parallel

OR

mpirun --hostfile machines -np 6 foamJob -p -s snappyHexMesh

But I only received "orted: command not found. A daemon (pid x) died unexpectantly with status x while attempting ..."

Afterwards I just executed the snappy command for one PC.

foamJob -p -s snappyHexMesh

That actually worked.

But now I am unable to run simpleFoam on multiple PCs. If I use the command with "mpirun --hostfile ... simpleFoam -parallel", then I receive the same error as above.

Does anyone have any experience with this?

Thanks in advanced.

Patrick

foam_noob · January 18, 2010, 07:27

Problem solved.

RBJ · February 2, 2010, 06:09

Can you please elaborate?

I have similar problems, but with a high perfomance cluster. (bsub on multiple machines).

I can run mpirun.lsf interFoam, but mpirun.lsf foamJob -p interFoam gives the error mentioned above

foam_noob · February 3, 2010, 03:18

Quote:

Originally Posted by RBJ

Can you please elaborate?

Hi,

to be honest, I wasn't the one who fixed the problem, my supervisor did and I'm not exactly sure what he did. Everytime I used OpenFOAM, I had to type in setfoam to get all the environment settings for OF adjusted. He just changed a few settings so I didn't have to type in setfoam everytime I opened a new terminal. Afterwards he told me to try run the calculation. I used the command in the user guide and it worked. He is often not at the office, so I can' t really asked him for the specifics.

Hope this helped a bit.

Patrick

RBJ · February 3, 2010, 04:14

Not really, but I've found a work-around for my problem already. My main problem, is that I have to use bsub for a run on a high performance cluster and there are some problems combining that with openmpi. Not really OpenFoam's fault though.
The work-around is to use only 1 processor on the HPC, with several nodes instead of spreading a job on multiple processors.

January 13, 2010, 05:12	parallel calculation on multiple computers	#1
foam_noob New Member Patrick Wang Join Date: Dec 2009 Location: Stuttgart, Germany Posts: 26 Rep Power: 16	Hi, I recenty figured out how to run snappy parallel on multiple computer. The method described in the user guide (Chapter 3) didn't work for me and I stumbled upon the solution by sheer accident. Instead of typing cpu=x after the name of the PCs, I used slots=x. I tried various methods to execute the command such as: mpirun --hostfile machines -np 6 snappyHexMesh -parallel OR mpirun --hostfile machines -np 6 foamJob -p -s snappyHexMesh But I only received "orted: command not found. A daemon (pid x) died unexpectantly with status x while attempting ..." Afterwards I just executed the snappy command for one PC. foamJob -p -s snappyHexMesh That actually worked. But now I am unable to run simpleFoam on multiple PCs. If I use the command with "mpirun --hostfile ... simpleFoam -parallel", then I receive the same error as above. Does anyone have any experience with this? Thanks in advanced. Patrick

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Meshing support parallel multiple computers!	Kevin	Siemens	1	July 26, 2007 20:27
running multiple Fluent parallel jobs	Michael Bo Hansen	FLUENT	8	June 7, 2006 09:52
Fluent cases in parallel across multiple machines	Riaan	FLUENT	3	April 11, 2005 12:51
Warning 097-	AB	Siemens	6	November 15, 2004 05:41
Parallel Calculation problem	Paul	CFX	0	August 11, 2003 23:45

January 18, 2010, 07:27		#2
foam_noob New Member Patrick Wang Join Date: Dec 2009 Location: Stuttgart, Germany Posts: 26 Rep Power: 16	Problem solved.

February 2, 2010, 06:09		#3
RBJ New Member Robin Koldeweij Join Date: Nov 2009 Posts: 19 Rep Power: 16	Can you please elaborate? I have similar problems, but with a high perfomance cluster. (bsub on multiple machines). I can run mpirun.lsf interFoam, but mpirun.lsf foamJob -p interFoam gives the error mentioned above

February 3, 2010, 04:14		#5
RBJ New Member Robin Koldeweij Join Date: Nov 2009 Posts: 19 Rep Power: 16	Not really, but I've found a work-around for my problem already. My main problem, is that I have to use bsub for a run on a high performance cluster and there are some problems combining that with openmpi. Not really OpenFoam's fault though. The work-around is to use only 1 processor on the HPC, with several nodes instead of spreading a job on multiple processors.