+/*
+ * CPU engine
+ *
+ * Doesn't transfer any data, merely burns CPU cycles according to
+ * the settings.
+ *
+ */
#include "../fio.h"
-#include "../os.h"
+#include "../optgroup.h"
-static int fio_cpuio_setup(struct thread_data fio_unused *td)
+struct cpu_options {
+ void *pad;
+ unsigned int cpuload;
+ unsigned int cpucycle;
+ unsigned int exit_io_done;
+};
+
+static struct fio_option options[] = {
+ {
+ .name = "cpuload",
+ .lname = "CPU load",
+ .type = FIO_OPT_INT,
+ .off1 = offsetof(struct cpu_options, cpuload),
+ .help = "Use this percentage of CPU",
+ .category = FIO_OPT_C_GENERAL,
+ .group = FIO_OPT_G_INVALID,
+ },
+ {
+ .name = "cpuchunks",
+ .lname = "CPU chunk",
+ .type = FIO_OPT_INT,
+ .off1 = offsetof(struct cpu_options, cpucycle),
+ .help = "Length of the CPU burn cycles (usecs)",
+ .def = "50000",
+ .parent = "cpuload",
+ .hide = 1,
+ .category = FIO_OPT_C_GENERAL,
+ .group = FIO_OPT_G_INVALID,
+ },
+ {
+ .name = "exit_on_io_done",
+ .lname = "Exit when IO threads are done",
+ .type = FIO_OPT_BOOL,
+ .off1 = offsetof(struct cpu_options, exit_io_done),
+ .help = "Exit when IO threads finish",
+ .def = "0",
+ .category = FIO_OPT_C_GENERAL,
+ .group = FIO_OPT_G_INVALID,
+ },
+ {
+ .name = NULL,
+ },
+};
+
+
+static int fio_cpuio_queue(struct thread_data *td, struct io_u fio_unused *io_u)
{
- return 0;
+ struct cpu_options *co = td->eo;
+
+ if (co->exit_io_done && !fio_running_or_pending_io_threads()) {
+ td->done = 1;
+ return FIO_Q_BUSY;
+ }
+
+ usec_spin(co->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", "cpu_load");
+ struct thread_options *o = &td->o;
+ struct cpu_options *co = td->eo;
+
+ if (!co->cpuload) {
+ td_vmsg(td, EINVAL, "cpu thread needs rate (cpuload=)","cpuio");
return 1;
- } else if (td->cpuload > 100)
- td->cpuload = 100;
+ }
+
+ if (co->cpuload > 100)
+ co->cpuload = 100;
+
+ /*
+ * set thinktime_sleep and thinktime_spin appropriately
+ */
+ o->thinktime_blocks = 1;
+ o->thinktime_spin = 0;
+ o->thinktime = (co->cpucycle * (100 - co->cpuload)) / co->cpuload;
+
+ o->nr_files = o->open_files = 1;
- td->nr_files = 0;
+ log_info("%s: ioengine=%s, cpuload=%u, cpucycle=%u\n",
+ td->o.name, td->io_ops->name, co->cpuload, co->cpucycle);
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 | FIO_NULLIO,
+ .open_file = fio_cpuio_open,
+ .flags = FIO_SYNCIO | FIO_DISKLESSIO | FIO_NOIO,
+ .options = options,
+ .option_struct_size = sizeof(struct cpu_options),
};
static void fio_init fio_cpuio_register(void)