1 #include <errno.h>
2 #include <fcntl.h>
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <string.h>
6 #include <sys/mman.h>
7 #include <sys/time.h>
8
9 #include "pagingtest.h"
10
pageinout_test(int test_runs,unsigned long long file_size)11 int pageinout_test(int test_runs, unsigned long long file_size) {
12 int fd;
13 char tmpname[] = "pageinoutXXXXXX";
14 unsigned char *vec;
15 int i;
16 long long j;
17 volatile char *buf;
18 int ret = -1;
19 int rc;
20 struct timeval begin_time, end_time, elapsed_time, total_time_in, total_time_out;
21 long pagesize = sysconf(_SC_PAGE_SIZE);
22
23 timerclear(&total_time_in);
24 timerclear(&total_time_out);
25
26 fd = create_tmp_file(tmpname, file_size);
27 if (fd < 0) {
28 return -1;
29 }
30
31 vec = alloc_mincore_vec(file_size);
32 if (vec == NULL) {
33 goto err_alloc;
34 }
35
36 buf = mmap(NULL, file_size, PROT_READ, MAP_PRIVATE, fd, 0);
37 if (buf == ((void *)-1)) {
38 fprintf(stderr, "Failed to mmap file: %s\n", strerror(errno));
39 goto err_mmap;
40 }
41
42 if (!check_caching((void *)buf, vec, file_size, false)) {
43 goto err;
44 }
45
46 for (i = 0; i < test_runs; i++) {
47 gettimeofday(&begin_time, NULL);
48 //Read backwards to prevent mmap prefetching
49 for (j = ((file_size - 1) & ~(pagesize - 1)); j >= 0; j -= pagesize) {
50 buf[j];
51 }
52 gettimeofday(&end_time, NULL);
53
54 timersub(&end_time, &begin_time, &elapsed_time);
55 timeradd(&total_time_in, &elapsed_time, &total_time_in);
56
57 if (!check_caching((void *)buf, vec, file_size, true)) {
58 goto err;
59 }
60
61 gettimeofday(&begin_time, NULL);
62 rc = madvise((void *)buf, file_size, MADV_DONTNEED) ||
63 posix_fadvise(fd, 0, file_size, POSIX_FADV_DONTNEED);
64 gettimeofday(&end_time, NULL);
65 if (rc) {
66 fprintf(stderr, "posix_fadvise/madvise DONTNEED failed\n");
67 goto err;
68 }
69
70 timersub(&end_time, &begin_time, &elapsed_time);
71 timeradd(&total_time_out, &elapsed_time, &total_time_out);
72
73 if (!check_caching((void *)buf, vec, file_size, false)) {
74 goto err;
75 }
76 }
77
78 printf("page-in: %llu MB/s\n", (file_size * test_runs * USEC_PER_SEC) /
79 (1024 * 1024 * (total_time_in.tv_sec * USEC_PER_SEC + total_time_in.tv_usec)));
80 printf("page-out (clean): %llu MB/s\n", (file_size * test_runs * USEC_PER_SEC) /
81 (1024 * 1024 * (total_time_out.tv_sec * USEC_PER_SEC + total_time_out.tv_usec)));
82
83 ret = 0;
84
85 err:
86 munmap((void *)buf, file_size);
87 err_mmap:
88 free(vec);
89 err_alloc:
90 close(fd);
91 return ret;
92 }
93