Known Issues and Limitations 

• Data type counts and other arguments with values larger than 2³¹-1 are not supported.

• Special MPI types MPI_FLOAT_INT, MPI_DOUBLE_INT, MPI_LONG_INT, MPI_SHORT_INT, MPI_2INT, MPI_LONG_DOUBLE_INT, MPI_2INTEGER are not changed and still use a 4-byte integer field.

• Predefined communicator attributes MPI_APPNUM, MPI_HOST, MPI_IO, MPI_LASTUSEDCODE, MPI_TAG_UB, MPI_UNIVERSE_SIZE, and MPI_WTIME_IS_GLOBAL are returned by the functions MPI_GET_ATTR and MPI_COMM_GET_ATTR as 4-byte integers. The same holds for the predefined attributes that may be attached to the window and file objects.

• Do not use the -i8 option to compile MPI callback functions, such as error handling functions, user-defined reduction operations.

• If you want to use the Intel® Trace Collector with the Intel MPI ILP64 executable files, you must use a special ITC library. If necessary, the Intel MPI mpiifort compiler driver will select the correct ITC library automatically.

• Use the mpif.h file instead of the MPI module in Fortran90* applications. The Fortran module supports 32-bit INTEGER size only.

• There is currently no support for C and C++ applications.