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/*
* CPU engine
*
* Doesn't transfer any data, merely burns CPU cycles according to
* the settings.
*
*/
#include "../fio.h"
static int fio_cpuio_queue(struct thread_data *td, struct io_u fio_unused *io_u)
{
usec_spin(td->o.cpucycle);
return FIO_Q_COMPLETED;
}
static int fio_cpuio_init(struct thread_data *td)
{
struct thread_options *o = &td->o;
if (!o->cpuload) {
td_vmsg(td, EINVAL, "cpu thread needs rate (cpuload=)","cpuio");
return 1;
}
if (o->cpuload > 100)
o->cpuload = 100;
/*
* set thinktime_sleep and thinktime_spin appropriately
*/
o->thinktime_blocks = 1;
o->thinktime_spin = 0;
o->thinktime = (o->cpucycle * (100 - o->cpuload)) / o->cpuload;
o->nr_files = o->open_files = 1;
return 0;
}
static int fio_cpuio_open(struct thread_data fio_unused *td,
struct fio_file fio_unused *f)
{
return 0;
}
static struct ioengine_ops ioengine = {
.name = "cpuio",
.version = FIO_IOOPS_VERSION,
.queue = fio_cpuio_queue,
.init = fio_cpuio_init,
.open_file = fio_cpuio_open,
.flags = FIO_SYNCIO | FIO_DISKLESSIO | FIO_NOIO,
};
static void fio_init fio_cpuio_register(void)
{
register_ioengine(&ioengine);
}
static void fio_exit fio_cpuio_unregister(void)
{
unregister_ioengine(&ioengine);
}
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