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88 lines
2.5 KiB
88 lines
2.5 KiB
#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include "pagingtest.h"
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#define LINESIZE 32
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int thrashing_test(int test_runs, bool cache) {
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int fds[4] = {-1, -1, -1, -1};
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char tmpnames[4][17] = { "thrashing1XXXXXX", "thrashing2XXXXXX", "thrashing3XXXXXX", "thrashing4XXXXXX" };
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volatile char *bufs[4] = {0};
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unsigned long long k;
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int ret = -1;
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struct timeval begin_time, end_time, elapsed_time, total_time;
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unsigned long long filesize;
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long num_pages;
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long pagesize;
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timerclear(&total_time);
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num_pages = sysconf(_SC_PHYS_PAGES);
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pagesize = sysconf(_SC_PAGE_SIZE);
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if (num_pages < 0) {
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fprintf(stderr, "failed to get the number of pages\n");
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return -1;
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}
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filesize = num_pages * pagesize / (ARRAY_SIZE(fds) - 1);
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for (size_t i = 0; i < ARRAY_SIZE(fds); i++) {
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fds[i] = create_tmp_file(tmpnames[i], filesize);
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if (fds[i] < 0) {
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goto err_fd;
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}
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}
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for (size_t i = 0; i < ARRAY_SIZE(fds); i++) {
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bufs[i] = mmap(NULL, filesize, PROT_READ, MAP_PRIVATE, fds[i], 0);
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if (bufs[i] == ((void *)-1)) {
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fprintf(stderr, "Failed to mmap file: %s\n", strerror(errno));
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goto err;
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}
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if (!cache) {
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//madvise and fadvise as random to prevent prefetching
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ret = madvise((void *)bufs[i], filesize, MADV_RANDOM) ||
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posix_fadvise(fds[i], 0, filesize, POSIX_FADV_RANDOM);
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if (ret) {
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goto err;
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}
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}
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}
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for (int i = 0; i < test_runs; i++) {
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for (size_t j = 0; j < ARRAY_SIZE(fds); j++) {
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gettimeofday(&begin_time, NULL);
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for (k = 0; k < filesize; k += pagesize) {
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bufs[j][k];
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}
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gettimeofday(&end_time, NULL);
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timersub(&end_time, &begin_time, &elapsed_time);
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timeradd(&total_time, &elapsed_time, &total_time);
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}
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}
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printf("%scached thrashing: %llu MB/s\n", cache ? "" : "un",
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(filesize * ARRAY_SIZE(fds) * test_runs * USEC_PER_SEC) /
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(1024 * 1024 * (total_time.tv_sec * USEC_PER_SEC + total_time.tv_usec)));
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ret = 0;
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err:
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for (size_t i = 0; i < ARRAY_SIZE(bufs) && bufs[i] != NULL; i++) {
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munmap((void *)bufs[i], filesize);
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}
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err_fd:
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for (size_t i = 0; i < ARRAY_SIZE(fds) && fds[i] >= 0; i++) {
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close(fds[i]);
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}
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return ret;
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}
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