I did and it runs now, but the result is wrong: outside is still 1.d0, 2.d0, 3.d0, 4.d0, 5.d0 How can I make sure to compile OpenMPI so that datatypes such as mpi_double_precision behave as they "should"? Are there flags during the OpenMPI building process or something? Thanks, -- Hugo Gagnon
On Tue, 27 Jul 2010 09:06 -0700, "David Zhang" <solarbik...@gmail.com> wrote: > Try mpi_real8 for the type in allreduce > > On 7/26/10, Hugo Gagnon <sourceforge.open...@user.fastmail.fm> wrote: > > Hello, > > > > When I compile and run this code snippet: > > > > 1 program test > > 2 > > 3 use mpi > > 4 > > 5 implicit none > > 6 > > 7 integer :: ierr, nproc, myrank > > 8 integer, parameter :: dp = kind(1.d0) > > 9 real(kind=dp) :: inside(5), outside(5) > > 10 > > 11 call mpi_init(ierr) > > 12 call mpi_comm_size(mpi_comm_world, nproc, ierr) > > 13 call mpi_comm_rank(mpi_comm_world, myrank, ierr) > > 14 > > 15 inside = (/ 1, 2, 3, 4, 5 /) > > 16 call mpi_allreduce(inside, outside, 5, mpi_double_precision, > > mpi_sum, mpi_comm_world, ierr) > > 17 > > 18 print*, myrank, inside > > 19 print*, outside > > 20 > > 21 call mpi_finalize(ierr) > > 22 > > 23 end program test > > > > I get the following error, with say 2 processors: > > > > forrtl: severe (174): SIGSEGV, segmentation fault occurred > > Image PC Routine Line > > Source > > libmpi.0.dylib 00000001001BB4B7 Unknown Unknown > > Unknown > > libmpi_f77.0.dyli 00000001000AF046 Unknown Unknown > > Unknown > > a.out 0000000100000CE2 _MAIN__ 16 > > test.f90 > > a.out 0000000100000BDC Unknown Unknown > > Unknown > > a.out 0000000100000B74 Unknown Unknown > > Unknown > > forrtl: severe (174): SIGSEGV, segmentation fault occurred > > Image PC Routine Line > > Source > > libmpi.0.dylib 00000001001BB4B7 Unknown Unknown > > Unknown > > libmpi_f77.0.dyli 00000001000AF046 Unknown Unknown > > Unknown > > a.out 0000000100000CE2 _MAIN__ 16 > > test.f90 > > a.out 0000000100000BDC Unknown Unknown > > Unknown > > a.out 0000000100000B74 Unknown Unknown > > Unknown > > > > on my iMac having compiled OpenMPI with ifort according to: > > http://software.intel.com/en-us/articles/performance-tools-for-software-developers-building-open-mpi-with-the-intel-compilers/ > > > > Note that the above code snippet runs fine on my school parallel cluster > > where ifort+intelmpi is installed. > > Is there something special about OpenMPI's MPI_Allreduce function call > > that I should be aware of? > > > > Thanks, > > -- > > Hugo Gagnon > > > > _______________________________________________ > > users mailing list > > us...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/users > > > > -- > Sent from my mobile device > > David Zhang > University of California, San Diego > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > -- Hugo Gagnon
