bak.c

@@ -1,56 +0,0 @@
-#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 | PROT_WRITE, MAP_PRIVATE, fd, 0);
+	void *mapped = mmap(NULL, file_size, PROT_READ, MAP_PRIVATE, fd, 0);
 	if (mapped == MAP_FAILED) {
 		perror("mmap");
 		close(fd);
@@ -44,14 +44,8 @@ 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

@@ -15,13 +15,9 @@ 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 100*1024*1024
+#define SIZE 400*1024*1024
-	unsigned long *p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE,
+	void *p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE,
 				MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 	if (!p) {
 		perror("fail to get memory");
@@ -29,29 +25,12 @@ void main()
 	}
 
 	madvise(p, SIZE, MADV_HUGEPAGE);
+	memset(p, 0x11, SIZE); /* write to get mem */
 
-	for (j = 0; j < SIZE / 8; j+=128)
-		*(p + j) = j;
-
-	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);
-	//}
 }