[petsc-users] MatView for huge matrix output

[Yujie]

I will double check the size of blocks in each node. Thanks a lot.

On Tue, Jun 29, 2010 at 9:53 PM, Jed Brown <jed at 59a2.org> wrote:
> On Tue, Jun 29, 2010 at 20:48, Yujie <recrusader at gmail.com> wrote:
>>
>> Thank you very much! I am writing it in parallel mode. I am using
>> MPICH not MPICH2. I don't know the mechanism in MatView. If I write in
>> paralle, there is no communication between nodes?
>
> There is still communication with the (parallel) file system.  I think there
> should be no problem if the local blocks are smaller than 2 GiB but there
> may be issues with larger blocks.  MPICH1 is old and unsupported, you should
> definitely upgrade unless you need support for a heterogeneous cluster (mix
> of 32 and 64-bit or different endianness).
> Jed