int lfs_test_streamread(){
int i=0;
uint64_t bw;
pthread_t tids[THREAD_NUMS];
srand(time(0));
uint64_t stime,ctime;
fd=open("/dev/sdb",O_RDWR,0666);
printf("fd=%d",fd);
srand(0);
for(i=0;i<MAXSIZE;i++){
offs[i]= AIO_BLKSIZE*(rand() % MAXSIZE);
}
stime = cur_usec();
for(i=0;i<THREAD_NUMS;i++){
printf("going to read %d\n",fd);
pthread_create(&tids[i],NULL,lfs_test_read,(void *)i);
}
for(i=0;i<THREAD_NUMS;i++){
pthread_join(tids[i],NULL);
}
ctime = cur_usec();
bw = AIO_BLKSIZE*MAXSIZE;
bw = bw / (ctime - stime);
printf("bw=%"PRIu64"",bw);
bw *= 1000000;
bw = bw / 1024;
printf("stat: bw = %"PRIu64" kB/s\n",bw);
return 1;
}
inline uint64_t
elapsed_usec() const
{
compiler_barrier();
const uint64_t t0 = start_;
const uint64_t t1 = cur_usec(m_);
compiler_barrier();
return t1 - t0;
}
inline uint64_t
lap()
{
compiler_barrier();
const uint64_t t0 = start_;
const uint64_t t1 = cur_usec(m_);
start_ = t1;
compiler_barrier();
return t1 - t0;
}
