Peter, The bulletproof way is to use MPI_Win_shared_query after MPI_Win_allocate_shared. I do not know if current behavior is a bug or a feature...
Cheers, Gilles On Wednesday, February 10, 2016, Peter Wind <peter.w...@met.no> wrote: > Hi, > > Under fortran, MPI_Win_allocate_shared is called with a window size of > zero for some processes. > The output pointer is then not valid for these processes (null pointer). > Did I understood this wrongly? shouldn't the pointers be contiguous, so > that for a zero sized window, the pointer should point to the start of the > segment of the next rank? > The documentation explicitly specifies "size = 0 is valid". > > Attached a small code, where rank=0 allocate a window of size zero. All > the other ranks get valid pointers, except rank 0. > > Best regards, > Peter > _______________________________________________ > users mailing list > us...@open-mpi.org <javascript:;> > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2016/02/28485.php >
