Update io engine comments

[fio.git] / engines / cpu.c

diff --git a/engines/cpu.c b/engines/cpu.c
index f65f91d9e0f988e17e7d426bdde81f778a7bf14b..d10669df0db0f4101138f68cc1b5589e31487273 100644 (file)
--- a/engines/cpu.c
+++ b/engines/cpu.c
@@ -1,30 +1,71 @@
+/*
+ * 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_queue(struct thread_data *td, struct io_u fio_unused *io_u)
+{
+       __usec_sleep(td->cpucycle);
+       return FIO_Q_COMPLETED;
+}
+
 static int fio_cpuio_setup(struct thread_data fio_unused *td)
 {
+       struct fio_file *f;
+       unsigned int i;
+
+       td->total_file_size = -1;
+       td->io_size = td->total_file_size;
+       td->total_io_size = td->io_size;
+
+       for_each_file(td, f, i) {
+               f->real_file_size = -1;
+               f->file_size = -1;
+       }
+
        return 0;
 }
 
 static int fio_cpuio_init(struct thread_data *td)
 {
        if (!td->cpuload) {
-               td_vmsg(td, EINVAL, "cpu thread needs rate");
+               td_vmsg(td, EINVAL, "cpu thread needs rate (cpuload=)","cpuio");
                return 1;
-       } else if (td->cpuload > 100)
+       }
+
+       if (td->cpuload > 100)
                td->cpuload = 100;
 
-       td->nr_files = 0;
+       /*
+        * set thinktime_sleep and thinktime_spin appropriately
+        */
+       td->thinktime_blocks = 1;
+       td->thinktime_spin = 0;
+       td->thinktime = (td->cpucycle * (100 - td->cpuload)) / td->cpuload;
 
+       td->nr_files = td->open_files = 1;
+       return 0;
+}
+
+static int fio_cpuio_open(struct thread_data fio_unused *td, struct fio_file *f)
+{
+       f->fd = 0;
        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,
 };
 
 static void fio_init fio_cpuio_register(void)