add functions unistd

src/core/disk_ops/disk_unistd.c

@@ -0,0 +1,273 @@
+/* StarPU --- Runtime system for heterogeneous multicore architectures.
+ *
+ * Copyright (C) 2013 Corentin Salingue
+ *
+ * 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 <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+
+#include <starpu.h>
+#include <core/disk.h>
+#include <core/perfmodel/perfmodel.h>
+
+#define NITER	64
+
+/* ------------------- use UNISTD to write on disk -------------------  */
+
+struct starpu_unistd_obj {
+	int descriptor;
+	char * path;
+	double size;
+};
+
+
+/* allocation memory on disk */
+static void * 
+starpu_unistd_alloc (void *base, size_t size STARPU_ATTRIBUTE_UNUSED)
+{
+	
+	struct starpu_unistd_obj * obj = malloc(sizeof(struct starpu_unistd_obj));
+	STARPU_ASSERT(obj != NULL);
+	int id = -1;
+
+	/* create template for mkstemp */
+	unsigned int sizeBase = 16;
+	while(sizeBase < (strlen(base)+7))
+		sizeBase *= 2;
+
+	char * baseCpy = malloc(sizeBase*sizeof(char));
+	STARPU_ASSERT(baseCpy != NULL);
+
+	char * tmp = "STARPU_XXXXXX";
+
+	strcpy(baseCpy, (char *) base);
+	strcat(baseCpy,tmp);
+
+	id = mkstemp(baseCpy);
+	/* fail */
+	if (id < 0)
+	{
+		free(obj);
+		free(baseCpy);
+		return NULL;
+	}
+
+	close(id);
+
+	id = open(baseCpy, O_DIRECT);
+	/* fail */
+        if (id < 0)
+        {
+                free(obj);
+                free(baseCpy);
+                return NULL;
+        }
+
+	int val = ftruncate(baseCpy,size);
+	printf("%d \n", val);
+	/* fail */
+	if (val < 0)
+	{
+		free(obj);
+		free(baseCpy);
+		unlink(baseCpy);
+		return NULL;
+	}
+
+	obj->descriptor = id;
+	obj->path = baseCpy;
+	obj->size = size;
+
+	return (void *) obj;
+}
+
+
+/* free memory on disk */
+static void
+starpu_unistd_free (void *base STARPU_ATTRIBUTE_UNUSED, void *obj, size_t size STARPU_ATTRIBUTE_UNUSED)
+{
+	struct starpu_unistd_obj * tmp = (struct starpu_unistd_obj *) obj;
+
+	unlink(tmp->path);
+	close(tmp->descriptor);
+
+	free(tmp->path);
+	free(tmp);
+}
+
+
+/* open an existing memory on disk */
+static void * 
+starpu_unistd_open (void *base, void *pos, size_t size)
+{
+	struct starpu_unistd_obj * obj = malloc(sizeof(struct starpu_unistd_obj));
+	STARPU_ASSERT(obj != NULL);
+
+	/* create template */
+	unsigned int sizeBase = 16;
+	while(sizeBase < (strlen(base)+strlen(pos)+1))
+		sizeBase *= 2;
+	
+	char * baseCpy = malloc(sizeBase*sizeof(char));
+	STARPU_ASSERT(baseCpy != NULL);
+	strcpy(baseCpy,(char *) base);
+	strcat(baseCpy,(char *) pos);
+
+	int id = open(baseCpy, O_DIRECT);
+	if (id < 0)
+	{
+		free(obj);
+		free(baseCpy);
+		return NULL;
+	}
+
+	obj->descriptor = id;
+	obj->path = baseCpy;
+	obj->size = size;
+
+	return (void *) obj;
+	
+}
+
+
+/* free memory without delete it */
+static void 
+starpu_unistd_close (void *base STARPU_ATTRIBUTE_UNUSED, void *obj, size_t size STARPU_ATTRIBUTE_UNUSED)
+{
+	struct starpu_unistd_obj * tmp = (struct starpu_unistd_obj *) obj;
+
+	close(tmp->descriptor);
+	free(tmp->path);
+	free(tmp);	
+}
+
+
+/* read the memory disk */
+static ssize_t 
+starpu_unistd_read (void *base STARPU_ATTRIBUTE_UNUSED, void *obj, void *buf, off_t offset, size_t size)
+{
+	struct starpu_unistd_obj * tmp = (struct starpu_unistd_obj *) obj;
+
+	int res = lseek(tmp->descriptor, offset, SEEK_SET); 
+	STARPU_ASSERT_MSG(res == 0, "Stdio read failed");
+
+	ssize_t nb = read(tmp->descriptor, buf, size);
+
+	return nb;
+}
+
+
+/* write on the memory disk */
+static ssize_t 
+starpu_unistd_write (void *base STARPU_ATTRIBUTE_UNUSED, void *obj, const void *buf, off_t offset, size_t size)
+{
+	struct starpu_unistd_obj * tmp = (struct starpu_unistd_obj *) obj;
+
+	int res = lseek(tmp->descriptor, offset, SEEK_SET); 
+	STARPU_ASSERT_MSG(res == 0, "Stdio write failed");
+
+	ssize_t nb = write (tmp->descriptor, buf, size);
+
+	return nb;
+}
+
+
+/* create a new copy of parameter == base */
+static void * 
+starpu_unistd_plug (void *parameter)
+{
+	char * tmp = malloc(sizeof(char)*(strlen(parameter)+1));
+	STARPU_ASSERT(tmp != NULL);
+	strcpy(tmp,(char *) parameter);
+	return (void *) tmp;	
+}
+
+
+/* free memory allocated for the base */
+static void
+starpu_unistd_unplug (void *base)
+{
+	free(base);
+}
+
+
+static int
+get_unistd_bandwidth_between_disk_and_main_ram(unsigned node)
+{
+
+	unsigned iter;
+	double timing_slowness, timing_latency;
+	struct timeval start;
+	struct timeval end;
+	
+	srand (time (NULL)); 
+	char * buf = malloc(SIZE_DISK_MIN*sizeof(char));
+	STARPU_ASSERT(buf != NULL);
+	
+	/* allocate memory */
+	void * mem = _starpu_disk_alloc(node, SIZE_DISK_MIN);
+	/* fail to alloc */
+	if (mem == NULL)
+		return 0;
+
+	/* Measure upload slowness */
+	gettimeofday(&start, NULL);
+	for (iter = 0; iter < NITER; ++iter)
+	{
+		_starpu_disk_write(node, mem, buf, 0, SIZE_DISK_MIN);
+	}
+	gettimeofday(&end, NULL);
+	timing_slowness = (double)((end.tv_sec - start.tv_sec)*1000000 + (end.tv_usec - start.tv_usec));
+
+
+	/* free memory */
+	free(buf);
+
+	buf = malloc(sizeof(char));
+	STARPU_ASSERT(buf != NULL);
+
+	/* Measure latency */
+	gettimeofday(&start, NULL);
+	for (iter = 0; iter < NITER; ++iter)
+	{
+		_starpu_disk_write(node, mem, buf, rand() % (SIZE_DISK_MIN -1) , 1);
+	}
+	gettimeofday(&end, NULL);
+	timing_latency = (double)((end.tv_sec - start.tv_sec)*1000000 + (end.tv_usec - start.tv_usec));
+
+	_starpu_disk_free(node, mem, SIZE_DISK_MIN);
+	free(buf);
+
+	_starpu_save_bandwidth_and_latency_disk((NITER/timing_slowness)*1000000, (NITER/timing_slowness)*1000000,
+					       timing_latency/NITER, timing_latency/NITER, node);
+	return 1;
+}
+
+
+
+struct starpu_disk_ops starpu_disk_unistd_ops = {
+	.alloc = starpu_unistd_alloc,
+	.free = starpu_unistd_free,
+	.open = starpu_unistd_open,
+	.close = starpu_unistd_close,
+	.read = starpu_unistd_read,
+	.write = starpu_unistd_write,
+	.plug = starpu_unistd_plug,
+	.unplug = starpu_unistd_unplug,
+	.copy = NULL,
+	.bandwidth = get_unistd_bandwidth_between_disk_and_main_ram
+};