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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#define FASTWRITER_SYNCIO_ALIGN 512
#define BUFSIZE 2097152
#define BLOCK_SIZE 2097152
#define WRITE_INTERVAL 1
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 last_write = 0;
size_t skip;
size_t run;
ssize_t res;
char *buffer;//[BUFSIZE];
long double mcoef = 1000000. / (1024 * 1024);
posix_memalign((void**)&buffer, FASTWRITER_SYNCIO_ALIGN, BUFSIZE);
if (argc < 2) {
printf("Usage: %s <directory|device> [skip]\n", argv[0]);
exit(0);
}
if (strstr(argv[1], "/dev/")) {
int fd = open(argv[1], O_RDONLY|O_NOATIME|O_LARGEFILE|O_DIRECT, 0);
if (fd < 0) {
printf("Unable to open device %s\n", argv[1]);
exit(1);
}
size_t size = BLOCK_SIZE;
gettimeofday(&start, NULL);
res = read(fd, buffer, size);
while (res > 0) {
if (res != size) {
printf("Incomplete read: %zu bytes read instead of %zu\n", res, size);
exit(-1);
}
total_size += res;
gettimeofday(&tv, NULL);
us = (tv.tv_sec - start.tv_sec) * 1000000 + (tv.tv_usec - start.tv_usec);
if ((us - last_write) > WRITE_INTERVAL * 1000000) {
last_write = us;
printf("Reading: %s (%lu GB), Measured speed: %zu MB/s\n", argv[0], total_size / 1024 / 1024 / 1024, (size_t)(mcoef * total_size / us));
}
res = read(fd, buffer, size);
}
close(fd);
if (res < 0) {
printf("Read failed with errno %i\n", errno);
exit(-1);
}
free(buffer);
return 0;
}
chdir(argv[1]);
if (argc > 2) {
SKIP = atoi(argv[2]);
printf("Skip %zu\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: %zu MB/s\n", ent->d_name, st.st_size/1024/1024, files, total_size / 1024 / 1024 / 1024, (size_t)(mcoef * total_size / us));
}
closedir(dir);
}
free(buffer);
}
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