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

Ted Sariyski tsariysk at craft-tech.com
Wed May 21 16:10:44 CDT 2014


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 
     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,

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