Thanks for the improvement there, Jens. With the bug fix patch I just mailed, it works for me. Dan On Mon, Feb 20, 2012 at 2:09 AM, Jens Axboe <axboe@xxxxxxxxx> wrote: > On 02/20/2012 10:15 AM, Jens Axboe wrote: >> On 02/17/2012 02:27 AM, Dan Ehrenberg wrote: >>> This patch allows two fio jobs to be kept to a certain >>> proportion of each other using token-based flow control. >>> There are three new parameters: flow, flow_watermark, and >>> flow_sleep, documented in the fio options. An example of an fio >>> job using these parameters is below: >>> >>> [global] >>> norandommap >>> thread >>> time_based >>> runtime=30 >>> direct=1 >>> ioengine=libaio >>> iodepth=256 >>> size=100g >>> bs=8k >>> filename=/tmp/testfile >>> flow_watermark=100 >>> flow_sleep=1000 >>> >>> [job2] >>> numjobs=1 >>> rw=write >>> flow=-8 >>> >>> [job1] >>> numjobs=1 >>> rw=randread >>> flow=1 >>> >>> The motivating application of this patch was to allow random reads >>> and sequential writes at a particular given proportion. >>> >>> This initial version is only correct when run with 'thread', as shared >>> state is represented with a global variable. It also only allows two >>> jobs to be synchronized properly. A future version might do more, but >>> no more functionality was needed for my application. >>> >>> Tested: Ran a few fio jobs with this flow control, observing >>> the proportion of IOPS to match what was intended by the job file. >>> Varied the flow_watermark and flow_sleep parameters and observed >>> the effect on throughput. >> >> I like this, it's definitely a useful feature. Any chance I could talk >> you into finishing the patch? You could have a flow_id= option, and then >> move the flow storage to being smalloc() backed. > > Since I'm in such a good mood today, I did it myself. See: > > http://git.kernel.dk/?p=fio.git;a=commit;h=9e684a4976b7934f5ce011ea281dfef3352e5738 > > It's your patch, just with a bit of glue to support arbitrary flows. If > you can confirm it still works for you, I'd appreciateit :-) > > -- > Jens Axboe > > -- > To unsubscribe from this list: send the line "unsubscribe fio" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
