Re: Random IO pattern ratios

[Jens Axboe <axboe@kernel.dk>]

On Fri, Apr 26 2013, Jens Axboe wrote:
> On Fri, Apr 26 2013, Jens Axboe wrote:
> > On Thu, Apr 25 2013, John Williams wrote:
> > > Are there any plans to add %random / %sequential capability to fio?
> > > 
> > > That is the only feature IOMeter has that I miss in fio.
> > 
> > Sure, that'd be pretty easy to add. Let me take a look this morning.
> 
> Done. Did a few test runs to check it.
> 
> percentage_random=50
> Random: 16313 (50.036808), Seq: 16289 (49.963192)
> 
> percentage_random=10
> Random: 3239 (9.942292), Seq: 29339 (90.057708)
> 
> percentage_random=72
> Random: 23467 (71.993496), Seq: 9129 (28.006504)
> 
> percentage_random=100
> Random: 32596 (99.990797), Seq: 3 (0.009203)
> 
> percentage_random=0
> Random: 1 (0.003066), Seq: 32613 (99.996934)
> 
> Note that the first IO is always counted as random, which is why the =0
> test says only 99.996% sequential. In fact it is fully sequential.

Committed with documentation:

http://git.kernel.dk/?p=fio.git;a=commit;h=211c9b8948b43ed47aedf1227e0444a58db015e4

So you can just grab the latest generated snapshot, or git update.

-- 
Jens Axboe