Hi Brock He's probably hitting the MPI address boundary of 2GB.
A workaround is to declare a user defined type (MPI_TYPE_CONTIGUOUS, or MPI_TYPE_VECTOR), to bundle a bunch of primitive data (e.g. reals), then send (broadcast for him/her) a smaller number of those types. See this thread: http://www.open-mpi.org/community/lists/users/2010/11/14792.php http://www.open-mpi.org/community/lists/users/2010/11/14816.php I hope this helps, Gus Correa On Jan 3, 2011, at 11:47 AM, Brock Palen wrote: > I have a user who reports that sending a broadcast of > > 540*1080 of reals (just over 2GB) fails with this: > > > *** An error occurred in MPI_Bcast > *** on communicator MPI_COMM_WORLD > *** MPI_ERR_TRUNCATE: message truncated > *** MPI_ERRORS_ARE_FATAL (your MPI job will now abort) > > I was reading the archives and there appears to be an issue with large > messages. I was a little confused, is there a way to send messages larger > than 2GB? > > The user has access to some IB machines, per a note in the archives there was > an issue with writev() would this issue only be related to messages over > ethernet? > > Thanks just trying to get some clarification. > > Brock Palen > www.umich.edu/~brockp > Center for Advanced Computing > bro...@umich.edu > (734)936-1985 > > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
