update

Signed-off-by: Wenchao Hao <haowenchao22@gmail.com>

bak.c

@@ -0,0 +1,56 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/time.h>
+
+unsigned long long tv_to_ms(struct timeval tv)
+{
+	return tv.tv_sec * 1000 + tv.tv_usec / 1000;
+}
+
+void main()
+{
+	char c;
+	pid_t pid;
+	int i;
+	struct timeval tv_b, tv_e;;
+#define SIZE 400*1024*1024
+	void *p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE,
+				MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+	if (!p) {
+		perror("fail to get memory");
+		exit(-1);
+	}
+
+	for (i = 0; i < 100000; i++) {
+		madvise(p, SIZE, MADV_HUGEPAGE);
+		memset(p, 0x11, SIZE); /* write to get mem */
+
+		gettimeofday(&tv_b, NULL);
+		madvise(p, SIZE, MADV_PAGEOUT);
+		gettimeofday(&tv_e, NULL);
+
+		printf("swp out bandwidth: %ld bytes/ms\n",
+				SIZE/(tv_to_ms(tv_e) - tv_to_ms(tv_b)));
+		
+		//pid = fork();
+
+		//if (pid) {
+			//scanf("%c", &c);
+			gettimeofday(&tv_b, NULL);
+			memset(p, 0x33, SIZE); /* write to get mem */
+			gettimeofday(&tv_e, NULL);
+			printf("swp in  bandwidth: %ld bytes/ms\n",
+					SIZE/(tv_to_ms(tv_e) - tv_to_ms(tv_b)));
+		//}
+	}
+
+	while(1) {
+		sleep(100);
+	}
+}

demo.c

@@ -33,7 +33,7 @@ int main(int argc, char **argv)
 	size_t file_size = sb.st_size;
 
 	printf("%ld, %d Kb\n", file_size, file_size/1024);
-	void *mapped = mmap(NULL, file_size, PROT_READ, MAP_PRIVATE, fd, 0);
+	void *mapped = mmap(NULL, file_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
 	if (mapped == MAP_FAILED) {
 		perror("mmap");
 		close(fd);
@@ -44,8 +44,14 @@ int main(int argc, char **argv)
 	max = file_size / 8;
 	p = malloc(file_size);
 
-	for (i = 0; i < max; i++)
+	for (i = 0; i < max; i++) {
 		*(p + i) = *(m + i);
+		*(m + i) = *(p + i);
+	}
+	
+	fork();
+	fork();
+	fork();
 
 	while(1);
 

madvise.c

@@ -15,9 +15,13 @@ unsigned long long tv_to_ms(struct timeval tv)
 
 void main()
 {
+	char c;
+	pid_t pid;
+	int i;
+	int j = 0;
 	struct timeval tv_b, tv_e;;
-#define SIZE 400*1024*1024
-	void *p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE,
+#define SIZE 100*1024*1024
+	unsigned long *p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE,
 				MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 	if (!p) {
 		perror("fail to get memory");
@@ -25,12 +29,29 @@ void main()
 	}
 
 	madvise(p, SIZE, MADV_HUGEPAGE);
-	memset(p, 0x11, SIZE); /* write to get mem */
 
-	gettimeofday(&tv_b, NULL);
-	madvise(p, SIZE, MADV_PAGEOUT);
-	gettimeofday(&tv_e, NULL);
+	for (j = 0; j < SIZE / 8; j+=128)
+		*(p + j) = j;
 
-	printf("swp out bandwidth: %ld bytes/ms\n",
-			SIZE/(tv_to_ms(tv_e) - tv_to_ms(tv_b)));
+	for (i = 0; i < 3; i++) {
+		gettimeofday(&tv_b, NULL);
+		madvise(p, SIZE, MADV_PAGEOUT);
+		gettimeofday(&tv_e, NULL);
+
+		printf("swp out bandwidth: %ld bytes/ms\n",
+				SIZE/(tv_to_ms(tv_e) - tv_to_ms(tv_b)));
+		
+		gettimeofday(&tv_b, NULL);
+		for (j = 0; j < SIZE / 8; j+=128)
+			*(p + j) = j;
+		gettimeofday(&tv_e, NULL);
+		printf("swp in  bandwidth: %ld bytes/ms\n",
+				SIZE/(tv_to_ms(tv_e) - tv_to_ms(tv_b)));
+	}
+
+	//madvise(p, SIZE, MADV_PAGEOUT);
+
+	//while(1) {
+	//	sleep(100);
+	//}
 }