[petsc-users] long int

[Mohammad Mirzadeh]

Sorry for misspells . It's my phone's auto correct!
On Jun 12, 2011 11:33 AM, "Mohammad Mirzadeh" <mirzadeh at gmail.com> wrote:
> Thanks Barry. Problem is my indices are all long and if I use the with
petsc
> the compiler will complain. Do you think casting them to int will solve
the
> problem? Also how does 64 bit international affect petsc performance?
>
> Thanks
> On Jun 12, 2011 9:39 AM, "Barry Smith" <bsmith at mcs.anl.gov> wrote:
>>
>> 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
>>>
>>
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