[CIG-MC] Installing ASPECT on Cray XC30

[Wolfgang Bangerth]

On 07/10/2017 06:00 PM, Marine Lasbleis wrote:
> 
> [0]PETSC ERROR: [1]PETSC ERROR: [3]PETSC ERROR: [2]PETSC ERROR: 
> ------------------------------------------------------------------------
> [0]PETSC ERROR: 
> ------------------------------------------------------------------------
> ------------------------------------------------------------------------
> [2]PETSC ERROR: 
> ------------------------------------------------------------------------
> [1]PETSC ERROR: [3]PETSC ERROR: Caught signal number 8 FPE: Floating Point 
> Exception,probably divide by zero
> [1]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger
> Caught signal number 8 FPE: Floating Point Exception,probably divide by zero

ASPECT uses signaling floating point NaNs to track down errors, but as Matt 
already mentioned, the error is only caught -- not generated -- by PETSc.

Do you get the same error if you run with one processor? If so, do you know 
how to generate a backtrace in a debugger to figure out where this is happening?

(I'll mention that on some systems with some compilers, we have seen these 
sorts of floating point exceptions come out of the standard C library -- 
that's highly annoying because it means that the system is defeating our ways 
of debugging problems. In that case, you can just disable floating point 
exceptions when you run ASPECT's cmake script. I think there is a blurb about 
that in the readme file. But before you do that, I'd still be interested to 
see whether you can get a backtrace :-) )

Best
  W.

-- 
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Wolfgang Bangerth          email:                 bangerth at colostate.edu
                            www: http://www.math.colostate.edu/~bangerth/