On Thu, Jan 31 2013, Carl Zwanzig wrote: > Hi, > > Am I correct that rwmixread/rwmixwrite are completely ignored unless > readwrite=rw or =randrw? Experiments suggest yes but I can't find > where this is handled in the code. (The HowTo file is silent on this.) That is correct, see io_u.c:get_rw_ddir(). The mix is only used if the data direciton is read-write. For pure read, always reads, for pure writes, always writes. > *Is there a description somewhere on how options are processed? > Tracking the option definition in options.c to its use has eluded me. So the options.c bits only ensure that the options are set. That is td->o.rwmix[]. The options ensure that mixread + mixwrite == 100%. The actual handling is in the function mentioned above, plus it interacts with an IO issue counter. Essentially the mix is IOPS based, with randomness for direction chosen. -- 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
