[petsc-users] CUDA with complex number

[Paul Mullowney]

I would claim that Petsc does not support GPU capabilities for complex 
numbers right now.

The CUSP library is templated over the scalar type (i.e. float or 
double), however I don't think it supports complex numbers. Although, I 
could be wrong on this.

It could be somewhat straightforward to move from CUSP to CUSPARSE (yes, 
these are different Nvidia libraries). I believe CUSPARSE supports SpMV 
for complex types. It also supports triangular solve for complex types.

-Paul

>      This is an installation issue, please send all installation issues to petsc-maint at mcs.anl.gov with the entire configure.log
>
>
>
>
>     You can try editing config/PETSc/packages/cuda.py and removing the two lines
>
>      if self.scalartypes.scalartype == 'complex':
>        raise RuntimeError('Must use real numbers with CUDA')
>
>     As it says we have never tested for complex so I do not know how far it is from working.
>
>      Barry
>
> On Jan 23, 2012, at 1:24 PM, recrusader wrote:
>
>> Dear PETSc Developers,
>>
>> I am compiling PETSc-dev using GPU in complex number mode.
>> However, when I configure PETSc-dev, I get the following errors
>> "
>> *******************************************************************************
>>          UNABLE to CONFIGURE with GIVEN OPTIONS    (see configure.log
>> for details):
>> -------------------------------------------------------------------------------
>> Cannot use cuda with complex numbers it is not coded for this capability
>> *******************************************************************************
>> "
>> I have checked CUSP. The latest version can support complex number.
>> What should I do for CUDA?
>> Thank you very much.
>>
>> Best,
>> Yujie