+/*
+ * CPU engine
+ *
+ * Doesn't transfer any data, merely burns CPU cycles according to
+ * the settings.
+ *
+ */
#include "../fio.h"
-#include "../os.h"
-static int fio_cpuio_setup(struct thread_data fio_unused *td)
+static int fio_cpuio_queue(struct thread_data *td, struct io_u fio_unused *io_u)
{
- return 0;
+ usec_spin(td->o.cpucycle);
+ return FIO_Q_COMPLETED;
}
static int fio_cpuio_init(struct thread_data *td)
{
- if (!td->cpuload) {
- td_vmsg(td, EINVAL, "cpu thread needs rate");
+ struct thread_options *o = &td->o;
+
+ if (!o->cpuload) {
+ td_vmsg(td, EINVAL, "cpu thread needs rate (cpuload=)","cpuio");
return 1;
- } else if (td->cpuload > 100)
- td->cpuload = 100;
+ }
- td->nr_files = 0;
+ 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,
- .setup = fio_cpuio_setup,
- .flags = FIO_CPUIO,
+ .open_file = fio_cpuio_open,
+ .flags = FIO_SYNCIO | FIO_DISKLESSIO | FIO_NOIO,
};
static void fio_init fio_cpuio_register(void)