70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/time.h>
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#define SIZE 500*1024*1024
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#define PAGE_SIZE 4096 // 4KB
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#define CHUNK_SIZE 8 * 1024 // 8KB
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unsigned long long tv_to_ms(struct timeval tv)
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{
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return tv.tv_sec * 1000 + tv.tv_usec / 1000;
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}
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int main()
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{
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int i;
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char *c;
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pid_t pid;
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unsigned long *p;
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struct timeval tv_b, tv_e;;
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p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (!p) {
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perror("fail to get memory");
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exit(-1);
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}
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c = (unsigned char *)p;
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/* fill data */
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for (i = 0; i < SIZE / 8; i += 8)
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*(p + i) = 0xffff + i;
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/* trigger pageout and get time of pageout */
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gettimeofday(&tv_b, NULL);
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madvise(p, SIZE, MADV_PAGEOUT);
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gettimeofday(&tv_e, NULL);
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printf("swp out bandwidth: %ld bytes/ms\n", SIZE/(tv_to_ms(tv_e) - tv_to_ms(tv_b)));
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/* read to trigger swapin and */
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gettimeofday(&tv_b, NULL);
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for (i = 0; i < SIZE; i += PAGE_SIZE)
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*(c + i) = i;
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gettimeofday(&tv_e, NULL);
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printf("swp in bandwidth: %ld bytes/ms\n", SIZE/(tv_to_ms(tv_e) - tv_to_ms(tv_b)));
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pid = fork();
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if (pid) {
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munmap(p, SIZE);
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return 0;
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}
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madvise(p, SIZE, MADV_PAGEOUT);
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while (1) {
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sleep(10);
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}
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return 0;
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}
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