char *data;
char *print_buf = NULL;
unsigned bs, count, i, print_bytes;
+ u64 total_time = 0;
int flags = 0;
int do_mmap = 0;
int fd;
fd = xopen(argv[6], O_RDONLY | flags, 0);
+ total_time = get_current_us();
if (do_mmap) {
data = mmap(NULL, count * buf_size, PROT_READ,
- MAP_SHARED, fd, offset);
+ MAP_SHARED | MAP_POPULATE, fd, offset);
if (data == MAP_FAILED)
die("Mmap failed");
}
-
- for (i = 0; i < count; i++) {
- if (do_mmap) {
- memcpy(buf, data + offset + buf_size * i, buf_size);
- ret = buf_size;
- } else {
+ if (!do_mmap) {
+ for (i = 0; i < count; i++) {
ret = pread(fd, buf, buf_size, offset + buf_size * i);
- }
- if (ret != buf_size)
- break;
+ if (ret != buf_size)
+ break;
- read_cnt += ret;
- if (i == 0)
- memcpy(print_buf, buf, print_bytes);
+ read_cnt += ret;
+ if (i == 0)
+ memcpy(print_buf, buf, print_bytes);
+ }
+ } else {
+ read_cnt = count * buf_size;
+ memcpy(print_buf, data, print_bytes);
}
- printf("Read %"PRIu64" bytes and print %u bytes:\n", read_cnt, print_bytes);
+ printf("Read %"PRIu64" bytes total_time = %"PRIu64" us, print %u bytes:\n",
+ read_cnt, get_current_us() - total_time, print_bytes);
printf("%08"PRIx64" : ", offset);
for (i = 1; i <= print_bytes; i++) {
printf("%02x", print_buf[i - 1]);