On 08/15/2012 05:55 AM, John Williams wrote: > I'm calling fio v2.0.8 from the command line in linux, and I wanted to > set the averaging time for the log data to 200msec. Here is the > command line I used: > > fio --name=SeqWrite --readwrite=write --bs=128K --iodepth=1 > --ioengine=libaio --direct=1 --invalidate=1 --output=/tmp/fio_output > --write_bw_log=bw_seq128K --write_lat_log=lat_seq128K > --write_iops_log=iops_seq128K --log_avg_msec=200 --randrepeat=0 > --norandommap --offset=0 --size=128035676160 --filename=/dev/sdaa > > But when I examined the logs that fio produced, the BW and the IOPS > logs had the default 500msec resolution. But the latency logs had my > requested 200msec resolution. > > Is this an fio bug, or did I misunderstand something? This is a bit confusing. Basically there are two time settings. One is for the statistics averaging, the other is when to make an entry in a log (if that is set). The default for IOPS and BW is to average over 500msec, regardless of logging times. So you would need to add --iopsavgtime=200 --bwavgtime=200 as well to get the desired behaviour. -- 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
