QLogic OFED+ Host Software User Guide, Rev. B

4–Running QLogic MPI on QLogic Adapters
QLogic MPI Limitations
• Several misconfigurations (such as mixed use of 32-bit/64-bit executables)
are detected by the runtime.
• A formatted list containing information useful for high-level MPI application
profiling is provided by using the -print-stats option with mpirun.
Statistics include minimum, maximum, and median values for message
transmission protocols as well as a more detailed information for expected
and unexpected message reception. See “MPI Stats” on page F-30 for more
information and a sample output listing.
NOTE:
The TotalView ® debugger can be used with the Open MPI supplied in this
release. Consult the TotalView documentation for more information.
QLogic MPI Limitations
The current version of QLogic MPI has the following limitations:
• 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 be between -2 31 and 2 31 -1, and the argument to
MPI_File_read_at must be between 0 and 2 32 -1.
4-28 D000046-005 B