mpi: test functionality provided in previous commit

mpi/tests/Makefile.am

@@ -102,7 +102,8 @@ starpu_mpi_TESTS =				\
 	multiple_send				\
 	mpi_scatter_gather			\
 	mpi_reduction				\
-	user_defined_datatype
+	user_defined_datatype			\
+	gather
 
 noinst_PROGRAMS =				\
 	datatypes				\
@@ -130,7 +131,8 @@ noinst_PROGRAMS =				\
 	multiple_send				\
 	mpi_scatter_gather			\
 	mpi_reduction				\
-	user_defined_datatype
+	user_defined_datatype			\
+	gather
 
 mpi_isend_LDADD =					\
 	../src/libstarpumpi-@STARPU_EFFECTIVE_VERSION@.la
@@ -184,6 +186,8 @@ mpi_reduction_LDADD =			\
 	../src/libstarpumpi-@STARPU_EFFECTIVE_VERSION@.la
 user_defined_datatype_LDADD =			\
 	../src/libstarpumpi-@STARPU_EFFECTIVE_VERSION@.la
+gather_LDADD =			\
+	../src/libstarpumpi-@STARPU_EFFECTIVE_VERSION@.la
 
 ring_SOURCES = ring.c
 ring_async_SOURCES = ring_async.c

mpi/tests/gather.c

@@ -0,0 +1,76 @@
+/* StarPU --- Runtime system for heterogeneous multicore architectures.
+ *
+ * Copyright (C) 2013  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 <starpu_mpi.h>
+#include "helper.h"
+
+int main(int argc, char **argv)
+{
+	int ret, rank, size;
+	starpu_data_handle_t handle;
+	int var;
+
+	MPI_Init(NULL, NULL);
+	MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+	MPI_Comm_size(MPI_COMM_WORLD, &size);
+
+//	if (size<3)
+//	{
+//		if (rank == 0)
+//			FPRINTF(stderr, "We need more than 2 processes.\n");
+//
+//		MPI_Finalize();
+//		return STARPU_TEST_SKIPPED;
+//	}
+
+	ret = starpu_init(NULL);
+	STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");
+	ret = starpu_mpi_init(NULL, NULL, 0);
+	STARPU_CHECK_RETURN_VALUE(ret, "starpu_mpi_init");
+
+	if (rank == 0)
+	{
+		int n;
+		for(n=1 ; n<size ; n++)
+		{
+			MPI_Status status;
+
+			FPRINTF_MPI("receiving from node %d\n", n);
+			starpu_variable_data_register(&handle, 0, (uintptr_t)&var, sizeof(var));
+			starpu_mpi_recv(handle, n, 42+n, MPI_COMM_WORLD, &status);
+			starpu_data_acquire(handle, STARPU_R);
+			STARPU_ASSERT_MSG(var == n, "Received incorrect value <%d> from node <%d>\n", var, n);
+			FPRINTF_MPI("received <%d> from node %d\n", var, n);
+			starpu_data_release(handle);
+			starpu_data_unregister(handle);
+		}
+	}
+	else
+	{
+		FPRINTF_MPI("sending to node %d\n", 0);
+		var = rank;
+		starpu_variable_data_register(&handle, 0, (uintptr_t)&var, sizeof(var));
+		starpu_mpi_send(handle, 0, 42+rank, MPI_COMM_WORLD);
+		starpu_data_unregister(handle);
+	}
+
+	starpu_mpi_shutdown();
+	starpu_shutdown();
+
+	MPI_Finalize();
+
+	return ret;
+}