max command hangs when using scotch decomposition

ssa_cfd · July 2, 2020, 03:55

Hi everyone,

In my solver, there is a command as follows

Code:

Info << "max/min Massendefekt: " << max(massendefektFeld).value() << "     " << min(massendefektFeld).value() << endl;

There is no problem, when I run in serial or parallel with simple decomposition.

But when I use scotch decomposition, the solver hangs exactly at this point.

I tried to comment out this line and then it runs smoothly.

Does anyone know why?

Thanks,
ssa.

clapointe · July 2, 2020, 10:59

If you want to find the max for a parallel case, try using gMax instead of max. There are loads of examples in the code, e.g. https://github.com/OpenFOAM/OpenFOAM...m/setRDeltaT.H.

Caelan

July 2, 2020, 03:55	max command hangs when using scotch decomposition	#1
ssa_cfd Member ssa Join Date: Sep 2018 Posts: 93 Rep Power: 7	Hi everyone, In my solver, there is a command as follows Code: Info << "max/min Massendefekt: " << max(massendefektFeld).value() << " " << min(massendefektFeld).value() << endl; There is no problem, when I run in serial or parallel with simple decomposition. But when I use scotch decomposition, the solver hangs exactly at this point. I tried to comment out this line and then it runs smoothly. Does anyone know why? Thanks, ssa. Last edited by ssa_cfd; July 2, 2020 at 10:35.

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July 2, 2020, 10:59		#2
clapointe Senior Member Join Date: Aug 2015 Posts: 494 Rep Power: 14	If you want to find the max for a parallel case, try using gMax instead of max. There are loads of examples in the code, e.g. https://github.com/OpenFOAM/OpenFOAM...m/setRDeltaT.H. Caelan