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mpi/starpu_mpi_collective.c

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+/* StarPU --- Runtime system for heterogeneous multicore architectures.
+ *
+ * Copyright (C) 2011  Centre National de la Recherche Scientifique
+ *
+ * StarPU is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
+ *
+ * StarPU 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 Lesser General Public License in COPYING.LGPL for more details.
+ */
+
+#include <mpi.h>
+#include <starpu.h>
+#include <starpu_mpi.h>
+
+int starpu_mpi_scatter_detached(starpu_data_handle *data_handles, int count, int root, MPI_Comm comm)
+{
+	int rank;
+	int x;
+
+	MPI_Comm_rank(comm, &rank);
+
+	for(x = 0; x < count ;  x++)
+	{
+		if (data_handles[x])
+		{
+			int owner = starpu_data_get_rank(data_handles[x]);
+			int mpi_tag = starpu_data_get_tag(data_handles[x]);
+			STARPU_ASSERT(mpi_tag >= 0);
+			if ((rank == root) && (owner != root))
+			{
+				//fprintf(stderr, "[%d] Sending data[%d] to %d\n", rank, x, owner);
+				starpu_mpi_isend_detached(data_handles[x], owner, mpi_tag, comm, NULL, NULL);
+			}
+			if ((rank != root) && (owner == rank))
+			{
+				//fprintf(stderr, "[%d] Receiving data[%d] from %d\n", rank, x, root);
+				starpu_mpi_irecv_detached(data_handles[x], root, mpi_tag, comm, NULL, NULL);
+			}
+		}
+	}
+	return 0;
+}
+
+int starpu_mpi_gather_detached(starpu_data_handle *data_handles, int count, int root, MPI_Comm comm)
+{
+	int rank;
+	int x;
+
+	MPI_Comm_rank(comm, &rank);
+
+	for(x = 0; x < count ;  x++)
+	{
+		if (data_handles[x])
+		{
+			int owner = starpu_data_get_rank(data_handles[x]);
+			int mpi_tag = starpu_data_get_tag(data_handles[x]);
+			STARPU_ASSERT(mpi_tag >= 0);
+			if ((rank == root) && (owner != root))
+			{
+				//fprintf(stderr, "[%d] Receiving data[%d] from %d\n", rank, x, owner);
+				starpu_mpi_irecv_detached(data_handles[x], owner, mpi_tag, comm, NULL, NULL);
+			}
+			if ((rank != root) && (owner == rank))
+			{
+				//fprintf(stderr, "[%d] Sending data[%d] to %d\n", rank, x, root);
+				starpu_mpi_isend_detached(data_handles[x], root, mpi_tag, comm, NULL, NULL);
+			}
+		}
+	}
+	return 0;
+}
+