[petsc-users] strange out memory issues or bus errors when increasing pb size

[Barry Smith]

> On Dec 16, 2016, at 8:45 AM, Aurelien Ponte <aurelien.ponte at ifremer.fr> wrote:
> 
> Hi,
> 
> I am inverting a 3D elliptical operator with petsc4py (3.4, petsc is 3.4.5)
> installed via conda: https://anaconda.org/sed-pro-inria/petsc4py
> 
> I get systematic crashes (out of memory or bus error) when I reach a certain
> 
> grid size (512 x 256 x 100) even though I maintain the same number of grid points per processor.
> I used up to 256 procs and got similar crashes.
> 
> Browsing the internet indicates that using 64-bit-indices may be cure for
> such pb.

   Yes, this is the problem.

> It will take however a significant amount of effort for me to install
> petsc4py and petsc with this option.

   Hopefully another user knows an easy way to install petsc4py to use 64 bit indices

> I do not even know how to check whether
> my current versions of petsc4py and petsc was installed with it.

  It was not.
> 
> Would you have any tips or recommendation about how I could address the issue ?
> 
> Thanks,
> 
> Aurelien
> 
> 
> -- 
> Aurélien Ponte
> Tel: (+33) 2 98 22 40 73
> Fax: (+33) 2 98 22 44 96
> UMR 6523, IFREMER
> ZI de la Pointe du Diable
> CS 10070
> 29280 Plouzané
>