[Nek5000-users] Seg. fault in running a backward facing step case.

[nek5000-users at lists.mcs.anl.gov]

Harish,

when we try to exit the code with an error message the code crashes. You turned on OIFS (T IFCHAR) but you don't have enough memory available. I think you can just increase lelt to avoid this problem. Anyway the code should print out a reasonable err-msg and not a SEGFAULT! 


Stefan



On Apr 9, 2010, at 4:33 PM, nek5000-users at lists.mcs.anl.gov wrote:

> Hello,
> 
> I am trying to simulate flow in a 3D backward facing step (BFS) geometry.
> 
> I have attached the *.box file and n2to3.in file that I use to create the
> 3D geometry. For reference logfile, *.rea and *.usr files are attached.
> The code is compiled with GNU compiler and OpenMPI. The code is compiled
> for 16 processors and compiler.out file is attached as well.
> 
> When I run the code, I get a seg. fault. After running the "gdb" tool on
> the core.* file, I get the following output. I have attached the gdb
> output file too.
> ===========================================================================
> Core was generated by `./nek5000'.
> Program terminated with signal 11, Segmentation fault.
> [New process 7652]
> #0  0x0000000000488768 in chcopy_ ()
> ===========================================================================
> 
> 3D BFS geometry has a wall at the bottom and symmetry b.c. at the top. But
> if I change the top b.c. with wall the simulation works. For reference I
> have attached the job output file.
> 
> Initially, I thought the problem was with memory limitations on my cluster
> for a bigger geometry. So I tried a smaller geometry, but I still kept
> getting seg. faults.
> 
> Help with solving this problem will be greatly appreciated. And sorry for
> attaching so many files.
> 
> Thanks,
> 
> Harish.<bfs.box><n2to3.in><logfile><bfs3d.rea><bfs3d.usr><Backstp.2323.o><gdb.output><compiler.out>_______________________________________________
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