ceph/src/test/old/test_seek_read.c

   1 #include "include/types.h"
   2 #include "common/Clock.h"
   3
   4 #include <linux/fs.h>
   5 #include <unistd.h>
   6 #include <sys/ioctl.h>
   7 #include <sys/types.h>
   8 #include <sys/stat.h>
   9 #include <fcntl.h>
  10 #include <string.h>
  11 #include <errno.h>
  12
  13 int main(int argc, char **argv)
  14 {
  15   char *fn = argv[1];
  16
  17   int fd = ::open(fn, O_RDWR|O_DIRECT);//|O_SYNC|O_DIRECT);
  18   if (fd < 0) return 1;
  19
  20   uint64_t bytes = 0;
  21   int r = ioctl(fd, BLKGETSIZE64, &bytes);
  22   uint64_t numblocks = bytes / 4096;
  23
  24   //uint64_t numblocks = atoll(argv[2]) * 4;// / 4096;
  25   int count = 1000;
  26
  27   cout << "fn " << fn << endl;
  28   cout << "numblocks " << numblocks << endl;
  29
  30   int blocks = 1;
  31   while (blocks <= 1024) {
  32     //cout << "fd is " << fd << endl;
  33
  34     void *buf;
  35     ::posix_memalign(&buf, 4096, 4096*blocks);
  36
  37     int s = blocks*4096;
  38
  39     utime_t start = ceph_clock_now();
  40     for (int i=0; i<count; i++) {
  41       off64_t o = (lrand48() % numblocks) * 4096;
  42       //cout << "s = " << s << " o = " << o << endl;
  43       //::lseek(fd, o, SEEK_SET);
  44       lseek64(fd, o, SEEK_SET);
  45
  46       int r = ::read(fd, buf, blocks*4096);
  47       //int r = ::read(fd, buf, s);
  48       if (r < 0) cout << "r = " << r << " " << strerror(errno) << endl;
  49     }
  50     utime_t end = ceph_clock_now();
  51
  52     double timeper = end - start;
  53     timeper /= count;
  54     cout << blocks << "\t" << s << "\t" << (double)timeper << endl;
  55
  56     blocks *= 2;
  57     free(buf);
  58   }
  59
  60   close(fd);
  61
  62 }
  63