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Peter W. Draper's avatar
Peter W. Draper authored
Mpi fixes

Fixes latest bug in #16.

Was generating tags for the sends/receives directly from the cell pointer addresses (they need to be per-cell unique identifiers). Turns out this was not a particularly robust solution as the maximum ID value is bounded to < 30 bits.

Switched to using a global counter, seems to work fine now.

See merge request !9


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