From: Yufei Ren <renyufei83@xxxxxxxxx>
Current cpu ioengine always bruns out 100 percent cpu cycles
no matter what the cpuload value is. Since no data is transferred
with cpuio, bytes_done would be ZERO. Consequently, think_time
is omitted and loops keeps running.
A cpuio example is added as well.
---
engines/cpu.c | 5 +++++
examples/cpuio | 8 ++++++++
2 files changed, 13 insertions(+), 0 deletions(-)
create mode 100644 examples/cpuio
diff --git a/engines/cpu.c b/engines/cpu.c
index 8bc9fd5..322dfde 100644
--- a/engines/cpu.c
+++ b/engines/cpu.c
@@ -10,6 +10,11 @@
static int fio_cpuio_queue(struct thread_data *td, struct io_u fio_unused *io_u)
{
usec_spin(td->o.cpucycle);
+
+ if (io_u->buflen == 0)
+ io_u->buflen = 1;
+ io_u->resid = 0;
+
return FIO_Q_COMPLETED;
}
diff --git a/examples/cpuio b/examples/cpuio
new file mode 100644
index 0000000..577e072
--- /dev/null
+++ b/examples/cpuio
@@ -0,0 +1,8 @@
+[global]
+ioengine=cpuio
+time_based
+runtime=10
+
+[burn50percent]
+cpuload=50
+
--
1.7.2.3
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