Yes, but it is a little more tricky than calling MPI_Bcast. The prototype of MPI_Bcast as defined by the MPI standard is: > int MPI_Bcast(void* buffer, int count, MPI_Datatype datatype, int root, > MPI_Comm comm)
This clearly prevents you from using a count larger than MAX_INT. However, you can build a datatype, by composing several types with counts under 1G and then use this datatype to do the bcast. George. On Apr 12, 2013, at 00:11 , William Au <au_wai_ch...@hotmail.com> wrote: > Hi, > > I am using openmpi 1.6 and when I tried to send a large array through > MPI_BCAST > in fortran. The number of count is larger than 3 billions. Although I > compiled openmpi and > my code with the option to declare my fortran integer as 64 bit long in > linux. I found out > that fortran pbcast_f.c will cast my *count to integer to call the c code > MPI_Bcast > > *ierr = OMPI_INT_2_FINT(MPI_Bcast(OMPI_F2C_BOTTOM(buffer), > OMPI_FINT_2_INT(*count), > > So my question is, is it possible to bcast more than MAX_INT count of > data_type in > openmpi? > > Thanks. > > Regards, > > William > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
