MPI wrappers for larger message sizes - #241
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hannesbrandt wants to merge 9 commits into
Open
hannesbrandt wants to merge 9 commits into
hannesbrandt wants to merge 9 commits into
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MPI wrappers for larger message sizes
Proposed changes:
This PR adds
sc_wrap_Isendandsc_wrap_Irecvwhich can be used to send/receive messages of bytes with a countlarger than the maximum allowed INT_MAX. The functions create a custom datatype to send the message. The workaround works for messages with size <= INT_MAX * sizeof(long) and aborts for larger message sizes. It is only enabled for MPI Standards 2.0 and above since it requires
MPI_Type_create_struct.The workaround and corresponding test was developed by @tim-griesbach.