X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=engines%2Fcpu.c;h=8bc9fd5c3c8c8919d4618bf6f149fb5b142093a6;hp=f65f91d9e0f988e17e7d426bdde81f778a7bf14b;hb=a1c58075279454a91ec43366846b93e8dcf9753c;hpb=f8fe35e8c9e88dd681ea151251d75f6116a958b4;ds=sidebyside

diff --git a/engines/cpu.c b/engines/cpu.c
index f65f91d9..8bc9fd5c 100644
--- a/engines/cpu.c
+++ b/engines/cpu.c
@@ -1,30 +1,54 @@
+/*
+ * 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)