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#include "include/types.h"
#include "common/Clock.h"
#include <linux/fs.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
int main(int argc, char **argv)
{
char *fn = argv[1];
int fd = ::open(fn, O_RDWR|O_DIRECT);//|O_SYNC|O_DIRECT);
if (fd < 0) return 1;
uint64_t bytes = 0;
int r = ioctl(fd, BLKGETSIZE64, &bytes);
uint64_t numblocks = bytes / 4096;
//uint64_t numblocks = atoll(argv[2]) * 4;// / 4096;
int count = 1000;
cout << "fn " << fn << endl;
cout << "numblocks " << numblocks << endl;
int blocks = 1;
while (blocks <= 1024) {
//cout << "fd is " << fd << endl;
void *buf;
::posix_memalign(&buf, 4096, 4096*blocks);
int s = blocks*4096;
double timeper = 0.0;
for (int i=0; i<count; i++) {
off64_t so, o = (lrand48() % numblocks) * 4096;
//cout << "s = " << s << " o = " << o << endl;
//::lseek(fd, o, SEEK_SET);
lseek64(fd, o, SEEK_SET);
int r = ::read(fd, buf, 4096);
//int r = ::read(fd, buf, s);
if (r < 0) cout << "r = " << r << " " << strerror(errno) << endl;
int range = 1000000/4096;
so = o + 4096*((rand() % range) );//- range/2);
//cout << o << " " << so << " " << (so-o) << endl;
utime_t start = ceph_clock_now();
lseek64(fd, so, SEEK_SET);
r = ::read(fd, buf, blocks*4096);
utime_t end = ceph_clock_now();
timeper += (end-start);
}
timeper /= count;
cout << blocks << "\t" << s << "\t" << (double)timeper << endl;
blocks *= 2;
free(buf);
}
close(fd);
}
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