4 * Doesn't transfer any data, merely burns CPU cycles according to
10 static int fio_cpuio_queue(struct thread_data *td, struct io_u fio_unused *io_u)
12 usec_spin(td->o.cpucycle);
14 if (io_u->buflen == 0)
18 return FIO_Q_COMPLETED;
21 static int fio_cpuio_init(struct thread_data *td)
23 struct thread_options *o = &td->o;
26 td_vmsg(td, EINVAL, "cpu thread needs rate (cpuload=)","cpuio");
34 * set thinktime_sleep and thinktime_spin appropriately
36 o->thinktime_blocks = 1;
37 o->thinktime_spin = 0;
38 o->thinktime = (o->cpucycle * (100 - o->cpuload)) / o->cpuload;
40 o->nr_files = o->open_files = 1;
44 static int fio_cpuio_open(struct thread_data fio_unused *td,
45 struct fio_file fio_unused *f)
50 static struct ioengine_ops ioengine = {
52 .version = FIO_IOOPS_VERSION,
53 .queue = fio_cpuio_queue,
54 .init = fio_cpuio_init,
55 .open_file = fio_cpuio_open,
56 .flags = FIO_SYNCIO | FIO_DISKLESSIO | FIO_NOIO,
59 static void fio_init fio_cpuio_register(void)
61 register_ioengine(&ioengine);
64 static void fio_exit fio_cpuio_unregister(void)
66 unregister_ioengine(&ioengine);