Add test for scratch data reuse

tests/Makefile.am

@@ -1,7 +1,7 @@
 # StarPU --- Runtime system for heterogeneous multicore architectures.
 #
 # Copyright (C) 2010-2018                                Inria
-# Copyright (C) 2009-2018                                Université de Bordeaux
+# Copyright (C) 2009-2019                                Université de Bordeaux
 # Copyright (C) 2010-2017                                CNRS
 #
 # StarPU is free software; you can redistribute it and/or modify
@@ -269,6 +269,7 @@ myPROGRAMS +=				\
 	datawizard/data_implicit_deps		\
 	datawizard/data_lookup			\
 	datawizard/scratch			\
+	datawizard/scratch_reuse		\
 	datawizard/sync_and_notify_data		\
 	datawizard/sync_and_notify_data_implicit\
 	datawizard/dsm_stress			\

tests/datawizard/scratch_reuse.c

@@ -0,0 +1,77 @@
+/* StarPU --- Runtime system for heterogeneous multicore architectures.
+ *
+ * Copyright (C) 2019									 Mirko Myllykoski
+ * Copyright (C) 2019									 Université de Bordeaux
+ *
+ * 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.h>
+#include "../helper.h"
+
+#if !defined(STARPU_HAVE_UNSETENV) || !defined(STARPU_USE_CPU) || !defined(STARPU_HAVE_HWLOC)
+#warning unsetenv is not defined or no cpu are available. Skipping test
+int main(void)
+{
+	return STARPU_TEST_SKIPPED;
+}
+#else
+
+#ifdef STARPU_QUICK_CHECK
+#define ITER 32
+#else
+#define ITER 128
+#endif
+
+static void kernel(void *buffers[], void *cl_args)
+{
+	STARPU_ASSERT(STARPU_MATRIX_GET_PTR(buffers[0]) != 0);
+}
+
+static struct starpu_codelet codelet = {
+	.name = "codelet",
+	.cuda_funcs = { kernel },
+	.nbuffers = 1,
+	.modes = { STARPU_SCRATCH },
+};
+
+int main(int argc, char *argv[])
+{
+	setenv("STARPU_LIMIT_CUDA_MEM", "50", 1);
+
+	int ret = starpu_initialize(NULL, &argc, &argv);
+	if (ret == -ENODEV) return STARPU_TEST_SKIPPED;
+	STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");
+
+	if (starpu_cuda_worker_get_count() == 0) {
+		starpu_shutdown();
+		return STARPU_TEST_SKIPPED;
+	}
+
+	starpu_data_handle_t handle[ITER];
+
+	int i;
+	for (i = 0; i < ITER; i++) {
+		starpu_matrix_data_register(&handle[i], -1, 0, 1024, 1024, 1024, sizeof(float));
+		ret = starpu_task_insert(&codelet, STARPU_SCRATCH, handle[i], 0);
+	}
+
+	starpu_task_wait_for_all();
+
+	for (i = 0; i < ITER; i++)
+		starpu_data_unregister(handle[i]);
+
+	starpu_shutdown();
+
+	return 0;
+}
+#endif