On 04/24/2015 04:50 PM, Akash Verma wrote:
If there's a load with a very small size, but forced to repeat using time_based, the runtime reported at the end, as well as IOPS, bandwidth are wrong. E.g. using this control file: [short_and_suite] rw=randread bs=128k size=128k ioengine=libaio time_based=1 runtime=1 filename=datafile.tmp (where datafile.tmp already exists, for a more dramatic demonstration) The results I'm seeing on a hard drive are: read : io=304128KB, bw=24750MB/s, iops=198000, runt= 12msec This is a regression from FIO 2.0.5, which gives the following results: read : io=242176KB, bw=242418KB/s, iops=1893 , runt= 999msec which is much more reasonable.
Looks like a shorter run, try runtime=1s. And that makes me wonder if the default conversion is buggy. What version are you comparing 2.0.5 to?
-- 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
