[mpich-discuss] Error: "MPIR_Get_contextid_sparse_group(1193): Too many communicators (0/2048)"

Balaji, Pavan balaji at anl.gov
Wed May 21 16:42:34 CDT 2014

Creating so many communicators is not a good idea.  Why can’t all processes open one large window?

  — Pavan

On May 21, 2014, at 4:10 PM, Ted Sariyski <tsariysk at craft-tech.com> wrote:

> Hi,
> I am working on a long-range interaction problem, so that communication is "each-to-each", although very sparse. My current approach is as follow:
>     1. If a process owns an object A,  it opens a shared window to this object.
>     2. If another process happens to generate data which belongs to A, which is determined on the fly, it 'put' its share to A.
> The algorithm works for small number of objects, but I need millions of them. I wonder:
>      1. Is it possible to increase the number of communicators above 2048?
>      2. Is it a scalable  approach? 
> Again, although that communication is 'each-to-each', it is extremely sparse. Any advise and comments are highly appreciated.
> Thanks in advance,
> --Ted
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