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- #include <stdio.h>
- #include <stdlib.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <sys/time.h>
- #include <unistd.h>
- #include <dirent.h>
- #define BUFSIZE 65536
- int main(int argc, char *argv[]) {
- int err;
- size_t SKIP = 1;
- DIR *dir;
- struct dirent *ent;
- struct timeval start, tv;
- size_t us;
- size_t files = 0;
- size_t total_size = 0;
- size_t skip;
- size_t run;
- char buffer[65536];
-
- if (argc < 2) {
- printf("Usage: %s <directory> [skip]\n", argv[0]);
- exit(0);
- }
-
- chdir(argv[1]);
- if (argc > 2) {
- SKIP = atoi(argv[2]);
-
- printf("Skip %i\n", SKIP);
- }
- gettimeofday(&start, NULL);
- for (run = 0; run < SKIP; run++) {
- skip = 0;
- dir = opendir(".");
- while (ent = readdir(dir)) {
- struct stat st;
-
- if (((skip++)%SKIP) != run) continue;
- if (stat(ent->d_name, &st)) continue;
- if (!S_ISREG(st.st_mode)) continue;
-
- FILE *f = fopen(ent->d_name, "r");
- if (!f) continue;
-
- int size = st.st_blksize;
-
- if (size > BUFSIZE) {
- printf("Buffer too small\n");
- exit(1);
- }
-
- while (!feof(f)) {
- err = fread(buffer, 1, size, f);
- if (err < 0) {
- printf("Read failed\n");
- exit(1);
- }
- }
-
- fclose(f);
- total_size += st.st_size;
- files++;
-
- gettimeofday(&tv, NULL);
- us = (tv.tv_sec - start.tv_sec) * 1000000 + (tv.tv_usec - start.tv_usec);
- printf("Reading: %s (%lu MB), Read: %lu files (%lu GB), Measured speed: %lu mB/s\n", ent->d_name, st.st_size/1024/1024, files, total_size / 1024 / 1024 / 1024, total_size / us);
- }
- closedir(dir);
- }
- }
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