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104 lines
1.9 KiB
104 lines
1.9 KiB
6 years ago
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdint.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#define N 1000
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#define FILESIZE 100
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#define NAMESIZE 100
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#define BUFSIZE 4096
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static char name[NAMESIZE];
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static char buf[BUFSIZE];
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static char *dir;
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void printstats(int reset)
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{
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int fd;
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int r;
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sprintf(name, "dev/stats");
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if((fd = open(name, O_RDONLY)) < 0) {
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return;
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}
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memset(buf, 0, FILESIZE);
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if ((r = read(fd, buf, BUFSIZE)) < 0) {
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perror("read");
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exit(1);
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}
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if (!reset)
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fprintf(stdout, "=== FS Stats ===\n%s========\n", buf);
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if ((r = close(fd)) < 0) {
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perror("close");
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}
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}
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static uint64_t
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usec_now()
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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uint64_t res = tv.tv_sec;
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res *= 1000000;
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res += tv.tv_usec;
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return res;
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}
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int main(int argc, char *argv[])
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{
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int i;
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int fd;
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uint64_t start, end;
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if (argc != 2) {
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printf("Usage: %s basedir\n", argv[0]);
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exit(-1);
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}
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dir = argv[1];
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sprintf(buf, "%s/d", argv[1]);
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if (mkdir(buf, S_IRWXU) < 0) {
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printf("%s: create %s failed %s\n", argv[0], buf, strerror(errno));
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exit(1);
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}
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printstats(1);
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start = usec_now();
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for (i = 0; ; i++) {
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sprintf(name, "%s/d/f%d", argv[1], i);
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if((fd = open(name, O_RDWR | O_CREAT | O_TRUNC, S_IRWXU)) < 0) {
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printf("%s: create %s failed %s\n", argv[0], name, strerror(errno));
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exit(1);
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}
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if (write(fd, buf, FILESIZE) != FILESIZE) {
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printf("%s: write %s failed %s\n", argv[0], name, strerror(errno));
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exit(1);
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}
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if (fsync(fd) < 0) {
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printf("%s: fsync %s failed %s\n", argv[0], name, strerror(errno));
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exit(1);
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}
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close(fd);
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end = usec_now();
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if (end - start > 1000000)
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break;
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}
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printf("%d files per %ld usec\n", i, end-start);
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printstats(0);
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return 0;
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}
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