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Subject: [OMPI users] Limitation of MPI_BCAST
From: William Au (au_wai_chung_at_[hidden])
Date: 2013-04-11 18:11:37


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),

So my question is, is it possible to bcast more than MAX_INT count of data_type in