No known limitations of which we are aware...the variables are all set to int32_t, so INT32_MAX would be the only limit I can imagine. In which case, you'll run out of memory long before you hit it.
have you ever did some analysis to understand if there is a limitation in the number of nodes usable with OpenMPI-v1.4 ?
Using also the functions MPI_Comm_spawn o MPI_Comm_spawn_multiple.
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