HP-MPI Version 1.1 for Windows Release Note

HP-MPI V1.1 for Windows Release Note

Fortran command line basics

ifort compute_pi.f /I"%MPI_ROOT%\include\64" /link /out:compute_pi.exe ^

/libpath:"%MPI_ROOT%\lib" /subsystem:console libhpmpi64.lib

autodouble (automatic promotion)

HP-MPI supports automatic promotion of Fortran datatypes using any of the following

arguments (some of which are not supported on all Fortran compilers).

/integer_size:64

/4I8

-i8

/real_size:64

/4R8

/Qautodouble

-r8

If these flags are given to the mpif90.bat script at link time, then the application will be

linked enabling HP-MPI to interpret the datatype MPI_REAL as 8 bytes (etc. as appropriate) at

runtime.

However, if your application is written to explicitly handle the autodoubled datatypes (e.g. if a

variable is declared real and the code is compiled -r8 and corresponding MPI calls are given

MPI_DOUBLE for the datatype), then the autodouble related command line arguments should

not be passed to mpif90.bat at link time (because that would cause the datatypes to be

automatically changed).