add example using --rate_poisson

Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/examples/poisson-rate-submission.fio b/examples/poisson-rate-submission.fio
new file mode 100644 (file)
index 0000000..6a94df8
--- /dev/null
+++ b/examples/poisson-rate-submission.fio
@@ -0,0 +1,14 @@
+[poisson-rate-submit]
+size=128m
+rw=randread
+ioengine=libaio
+iodepth=32
+direct=1
+# by setting the submit mode to offload, we can guarantee a fixed rate of
+# submission regardless of what the device completion rate is.
+io_submit_mode=offload
+rate_iops=50
+# Real world random request flow follows Poisson process. To give better
+# insight on latency distribution, we simulate request flow under Poisson
+# process.
+rate_poisson=1
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