memcpy(&td->start, &td->epoch, sizeof(struct timeval));
memcpy(&td->iops_sample_time, &td->epoch, sizeof(struct timeval));
memcpy(&td->bw_sample_time, &td->epoch, sizeof(struct timeval));
memcpy(&td->start, &td->epoch, sizeof(struct timeval));
memcpy(&td->iops_sample_time, &td->epoch, sizeof(struct timeval));
memcpy(&td->bw_sample_time, &td->epoch, sizeof(struct timeval));