[petsc-users] cannot compile/use ml with 64 bit integers

[Xiangdong]

On Fri, Feb 21, 2014 at 3:28 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>   Though ml does support 64 bit integers for long vectors they do it in a
> fundamentally different way than PETSc; only certain integer data is stored
> in 64 bit form while most integer values are stored in 32 bit integers. In
> PETSc we manage all integers as either 32 or 64 bit so mixing the two
> libraries in this case is not possible without a huge amount of work.
>  Sorry about this.
>
>    You might consider using hype's Boomeramg or PETSc's GAMG algebraic
> multigrid solvers instead, both of which can be used with 64 bit indices.
>

Thanks a lot for your suggestions. That is very helpful.

Xiangdong


>
>    Barry
>
> On Feb 21, 2014, at 1:15 PM, Xiangdong <epscodes at gmail.com> wrote:
>
> > Hello everyone,
> >
> > When I compile petsc with options -with-64-bit-indices and  ml packages,
> I got the error like this: "Cannot use ml with 64 bit integers, it is not
> coded for this capability".
> >
> > If I want to use ml as a preconditioner for long vectors (> 2 billions),
> is there any solution?
> >
> > Thank you.
> >
> > Best,
> > Xiangdong
> >
>
>
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