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3 – Using InfiniPath MPI
InfiniPath MPI Limitations
3-22 IB6054601-00 D
Q
No ports available on /dev/ipath
NOTE: If port sharing is enabled, this limit is raised to 16 and 8 respectively. To
enable port sharing, set PSM_SHAREDPORTS=1 in your environment
There are no C++ bindings to MPI -- use the extern C MPI function calls.
In MPI-IO file I/O calls in the Fortran binding, offset or displacement arguments are
limited to 32 bits. Thus, for example, the second argument of
MPI_File_seek must
lie between -2
31
and 2
31
-1, and the argument to MPI_File_read_at must lie
between 0 and 2
32
-1.