[mpich-discuss] Error: "MPIR_Get_contextid_sparse_group(1193): Too many communicators (0/2048)"
tsariysk at craft-tech.com
Thu May 22 09:46:39 CDT 2014
It is about MPI_win. Here is the problem as it relates to MPI (it is a
Boltzmann type equation).
There are N particles interacting with each other. Interaction is
directional, so that a particle interacts only with those particles,
which are within a narrow cone. The first step is to segregate the
initial set of N particles into subsets of particles (I called it
'objects'), which interact with each other. Here is what I do:
1. Assign each object to a process.
2. The process which owns a object:
* Makes a guess for the maximum number of particles expected in
* Allocates memory for it.
* Opens a shared window.
3. All processes
* Each particle identify which object it belongs to, and PUTs its
4. After assembly is done, objects are passed to a solver.
What do you mean with: "Why can’t all processes open one large window?"
I guess I miss something.
On 05/21/2014 11:03 PM, Balaji, Pavan wrote:
> On May 21, 2014, at 6:02 PM, Ted Sariyski <tsariysk at craft-tech.com> wrote:
>> Memory limitations. With one large window all processes have to allocate memory for the objects they own as well as for objects assigned to other process.
> Are we talking about the same thing here? I’m referring to an MPI_Win. What objects do processes need to keep track of?
> — Pavan
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