Sounds like your wait statements are not correct. Referring to HOWTO.txt : wait Wait for 'offset' microseconds. Everything below 100 is discarded. What kind of storage device do you have under /dev/sdb ? On Tue, Apr 7, 2015 at 10:41 AM, Mansour Shafaei Moghaddam <mansoor.shafaei@xxxxxxxxx> wrote: > Hi all, > > I have made an I/O trace which includes "read", "write" and "wait" " > commands. When I replay the trace with high I/O depths (for example > 32) I see around 10s (!!!!) of latency for completion of 99% of reads > and 6.5s latency for the writes. Does anyone know what exactly it > means and what is wrong here? > It is also notable that the average wait time between I/Os is around > 14ms and its median is 8ms. > > Here is my job file: > > [global] > ioengine=libaio > direct=1 > iodepth=32 > log_offset=1 > read_iolog=temp > write_bw_log=replay > write_lat_log=replay > write_iops_log=replay > [job] > > > > and here is a part of my trace: > > fio version 2 iolog > /dev/sdb add > /dev/sdb open > /dev/sdb wait 0 512 > /dev/sdb read 52321808896 36352 > /dev/sdb wait 89 512 > /dev/sdb read 52478476288 131072 > /dev/sdb wait 192 512 > /dev/sdb read 52499185664 131072 > /dev/sdb wait 208 512 > > Thanks in advance > -- > 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
