Add support for mixing a random IO workload a bit
Now you can append a number to randread/randwrite (and others) to
specify only getting a random offset for every X number of ios.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/HOWTO b/HOWTO
index 7661371..051a455 100644
--- a/HOWTO
+++ b/HOWTO
@@ -228,7 +228,14 @@
For the mixed io types, the default is to split them 50/50.
For certain types of io the result may still be skewed a bit,
- since the speed may be different.
+ since the speed may be different. It is possible to specify
+ a number of IO's to do before getting a new offset - this
+ is only useful for random IO, where fio would normally
+ generate a new random offset for every IO. If you append
+ eg 8 to randread, you would get a new random offset for
+ every 8 IO's. The result would be a seek for only every 8
+ IO's, instead of for every IO. Use rw=randread:8 to specify
+ that.
randrepeat=bool For random IO workloads, seed the generator in a predictable
way so that results are repeatable across repetitions.