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Diffstat (limited to 'btl/libs/BLACS/blacsinit.hh')
| -rw-r--r-- | btl/libs/BLACS/blacsinit.hh | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/btl/libs/BLACS/blacsinit.hh b/btl/libs/BLACS/blacsinit.hh new file mode 100644 index 0000000..41f5ebf --- /dev/null +++ b/btl/libs/BLACS/blacsinit.hh @@ -0,0 +1,38 @@ +//===================================================== +// Copyright (C) 2011 Andrea Arteaga <andyspiros@gmail.com> +//===================================================== +// +// This program is free software; you can redistribute it and/or +// modify it under the terms of the GNU General Public License +// as published by the Free Software Foundation; either version 2 +// of the License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +// +#ifndef BLACSINIT_HH +#define BLACSINIT_HH + +#include <cmath> + +bool blacsinit(int *argc, char ***argv) +{ + int context, myid, numproc, prows, pcols, iZERO = 0; + MPI_Init(argc, argv); + blacs_pinfo_(&myid, &numproc); + blacs_get_(&iZERO, &iZERO, &context); + + int p = static_cast<double>(std::sqrt(static_cast<double>(numproc)) + 1.); + while (numproc % p) --p; + prows = p; pcols = numproc/p; + + blacs_gridinit_(&context, "Row-major", &prows, &pcols); + return (myid == 0); +} + +#endif /* BLACSINIT_HH */ |