A Survey
of MPI Implementations
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MPICH does not implement MPI_Cancel according to the MPI
specification (it can't always cancel sends). As described above, this
``bug'' has been repeated in many MPICH-derived implementations but is
not too important. An earlier version of MPICH used Fortran common
blocks to implement some Fortran MPI constants. This is fixed (with a
lot of work) in the current MPICH release (1.1), but remains in many
MPICH-derived implementations. While MPICH is generally carefully
written, there are many MPICH routines that are not implemented as
efficiently as they could be. Sometimes these are fixed in
MPICH-derived implementations, but often not. An example is the
MPI_Alltoall routine, which is implemented in a way that is likely
to cause hot spots in any network.
Copyright © 1996
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