X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=engines%2Fcpu.c;h=3d855e363c3212ba3d0c656ac5e2e92de1da1c05;hp=27ec6da1f261575bdd98999cacb81184e2c78d77;hb=f70afaca743f2971312d9928f069a9ea7daeccf7;hpb=4d9345ae968ca92ace3dab06c25a9b73159cb329

diff --git a/engines/cpu.c b/engines/cpu.c
index 27ec6da1..3d855e36 100644
--- a/engines/cpu.c
+++ b/engines/cpu.c
@@ -1,30 +1,114 @@
+/*
+ * 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");
+	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)