Re: wrong percent with vsync+randrw

From: Jens Axboe <>
Date: Mon, 7 Apr 2008 10:04:51 +0200

On Mon, Apr 07 2008, Zhang, Yanmin wrote:
> Jens,
> I ran a testing with vsync+randrw. I expected the both read and write's precent are
> 50%. But vmstat showed write was more than 99%.

The problem here is that the window service is too small, because of
your big queue depth. I modified the fio algorithm to only look into ios
issued, I think that is the fair metric. With that, you should have a
nice distribution between reads and writes - can you pull the update and
see that it works for you?

Jens Axboe
Received on Mon Apr 07 2008 - 10:04:51 CEST

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