John -- This cartesian stuff always makes my head hurt. :-)
You seem to have hit on a bona-fide bug. I have fixed the issue in our SVN trunk and will get the fixed moved over to the v1.6 and v1.7 branches. Thanks for the report! On Aug 29, 2012, at 5:32 AM, Craske, John wrote: > Hello, > > We are partitioning a two-dimensional Cartesian communicator into > two one-dimensional subgroups. In this situation we have found > that both one-dimensional communicators inherit the period > logical of the first dimension of the original two-dimensional > communicator when using Open MPI. Using MPICH each > one-dimensional communicator inherits the period corresponding to > the dimensions specified in REMAIN_DIMS, as expected. Could this > be a bug, or are we making a mistake? The relevant calls we make in a > Fortran code are > > CALL MPI_CART_CREATE(MPI_COMM_WORLD, 2, (/ NDIMX, NDIMY /), (/ .True., > .False. /), .TRUE., > COMM_CART_2D, IERROR) > > CALL MPI_CART_SUB(COMM_CART_2D, (/ .True., .False. /), COMM_CART_X, IERROR) > CALL MPI_CART_SUB(COMM_CART_2D, (/ .False., .True. /), COMM_CART_Y, IERROR) > > Following these requests, > > CALL MPI_CART_GET(COMM_CART_X, MAXDIM_X, DIMS_X, PERIODS_X, COORDS_X, IERROR) > CALL MPI_CART_GET(COMM_CART_Y, MAXDIM_Y, DIMS_Y, PERIODS_Y, COORDS_Y, IERROR) > > will result in > > PERIODS_X = T > PERIODS_Y = T > > If, on the other hand we define the two-dimensional communicator > using PERIODS = (/ .False., .True. /), we find > > PERIODS_X = F > PERIODS_Y = F > > Your advice on the matter would be greatly appreciated. > > Regards, > > John. > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
