Re: Helping to model this workload

[Jens Axboe <axboe@kernel.dk>]

On Tue, Jul 23 2013, Neto, Antonio Jose Rodrigues wrote:
> Hi All
> 
> This is neto from Brazil
> 
> How are you?
> 
> I need to model the following workload:
> 
> Sequential Read % 35.0
> Sequential Write % 5.0
> Random Read % 50.0
> Random Write % 10.0
> Random Read Working Set(GB) 1000.0
> Random Write Working Set(GB) 1000.0
> Sequential Read Size(KB) 64KB
> Sequential Write Size(KB) 64KB
> Random Read Size(KB) 8KB
> Random Write Size(KB) 8KB

So that's 85% reads and 15% writes, first part:

rw=randrw
rwmixread=85

and then you have 50/85 reads random and 35/85 reads sequential. That's
roughly 59% reads random. On the writes, you have 10/15 random and 5/15
sequential. That's roughly 67% writes random:

percentage_random=59,67

The latter I just added support for, before it only support a single
setting for reads and writes.

Fio does not support splitting block sizes on a random/sequential basis.
You will have to improvise there.

-- 
Jens Axboe