Just a thought that came to mind. To work around the problem would the following work? Run fio to get you max MB/s Write a script to generate you work/jobs file that has randomizes length of time for the job to run and % of max for it to run at. Thanks, Roger On Thu, Jun 27, 2013 at 5:02 AM, Jens Axboe <axboe@xxxxxxxxx> wrote: > On Thu, Jun 27 2013, James Vanns wrote: >> Hi. I'm new to fio and though I've read the HOWTO from the git repo several times now, I'm unsure if it is possible to achieve what I want; >> >> I can simulate a mix of sequential and random writes for a duration at >> an average rate or throughput of say, 5.4MB/s. I presume that fio >> will attempt to sustain that rate? My real question is this - is it >> possible in either the same job or a different job in the same file to >> simulate bursts of higher rates? I.e. on average attempt to write at >> nMB/s but at random or irregular intervals during this period attempt >> a 'burst' of 138MB/s for 5 minutes and then return to the 'normal' >> rate. Then again at some other point a burst of 57MB/s for 30minutes >> etc. >> >> Is this possible? Presently I've found that I cannot do this. Or >> rather, thinking about it, I'd have to specify n jobs for each >> different rate and then perhaps use 'ratecycle' and 'thinktime'? I >> can't see how to skew 'thinktime' randomly though? > > That's currently not possible, fio only supports a fixed rate. But if > you have a good idea on how to express your criteria as an option (or > options), then it can surely be added :-) > > -- > 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
