[petsc-users] long int

[Barry Smith]

On Jun 12, 2011, at 1:48 AM, Mohammad Mirzadeh wrote:

> I guess I figured it out. On 64-bit OS long long and long are the same and I may as well just use --with-64-bit-ints flag. 

   You only need to configure PETSc with --with-64-bit-indices if you are dealing with problems with over 2 billion unknowns (in parallel) or if the sparse matrix will have more than 2 billion nonzeros on a single process.  You do not need to use --with-64-bit-indices just because you are using 64 bit pointers, only for really large problems.


   Barry

> 
> Thanks
> 
> 
> On Sat, Jun 11, 2011 at 11:22 PM, Mohammad Mirzadeh <mirzadeh at gmail.com> wrote:
> Hi guys,
> 
> How can I use long int instead of PetscInt in the functions? Does simply changing the definition of PetscInt solve the problem?
> 
> Thanks
>