[mpich-discuss] Maximum number of communicators

[Palmer, Bruce J]

Hi,

I’m looking at using MPI RMA to support sparse data structures in Global Arrays. I’ve got an application that uses a large number of sparse arrays and it is failing when the number of sparse arrays reaches about 500. Each sparse array is built on top of 4 conventional global arrays and each global array uses one MPI Window. Each Window appears to be creating its own communicator and I’m hitting an internal limit at 2048 communicators. Is there a way to increase the number of communicators?

Bruce Palmer
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