[OpenFOAM.org] OpenFoam on Power8 Little Endian Error: Unknown function type forceCoeffs

P8le · November 26, 2014, 15:38

My goal is to get OpenFoam 2.3.0 running on the new Power8 Little Endian with Ubuntu 14.10.
I have managed to compile the program and run some first tests including MPI (OpenMPI 1.8.3). Now I try to run the motorbike tutorial. The first part runs well, but when it start the motorBikeLES part picofoam exits with an error:

[7] --> FOAM FATAL ERROR:
[7] Unknown function type forceCoeffs

(full log file see in attachement.)

At the same time I compiled an Intel version on Red Hat from the same sources. This one runs fine with OpenMPI 1.6.5. When I compare the known function types between Power8 and Intel, I see that two are missing on Power8:
forceCoeffs
forces
all the other types match between Intel and Power8.

Does anybody have a clue where I should ask to search for the bug?

I am new to OpenFOAM so I don't have much background about the program or fluid dynamics. So it maybe that I didn't provide all the necessary information. Please let me know if you need more details.

P8le · November 28, 2014, 08:00

I have solved the problem, although I still don't know what the root cause was.
Just using xlC instead of g++ to create libforces.so helps.
xlC: V13.1.1
g++: 4.9.1

I have had similar problems before where g++ simply failed to create some .so files because it got confused about some symbols. xlC always could solve it.
It is a bit weird because to my knowledge, both call ld under the covers. But perhaps with different switches.

And of course: it is log.pisoFoam not picoFoam.
I used the motorBike tutorial in pisoFoam and not the one in simpleFoam.

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November 28, 2014, 08:00		#2
P8le New Member Markus Buehler Join Date: Nov 2014 Posts: 2 Rep Power: 0	I have solved the problem, although I still don't know what the root cause was. Just using xlC instead of g++ to create libforces.so helps. xlC: V13.1.1 g++: 4.9.1 I have had similar problems before where g++ simply failed to create some .so files because it got confused about some symbols. xlC always could solve it. It is a bit weird because to my knowledge, both call ld under the covers. But perhaps with different switches. And of course: it is log.pisoFoam not picoFoam. I used the motorBike tutorial in pisoFoam and not the one in simpleFoam.