Re: Blktrace replay in FIO runs only 1 Job when numjobs>1 in FIO

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Can someone help me with this? Pointers will be really helpful

On Wed, Dec 4, 2013 at 11:04 AM, Lakshmi <sendtold@xxxxxxxxx> wrote:
> Hi,
>
>  My FIO job File looks like this
> [ssd]
> rw=randread
> bs=4k
> iodepth=8
> numjobs=8
> group_reporting=1
> ioengine=sync
> filename=/dev/sdb
> runtime=120
>
> I ran this job and while this job was running I ran a  Blktrace and
> parsed it to a .bin file.
>
> The actual FIO run showed the results of all 8 jobs as below,
>
> ssd: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=sync, iodepth=8
> fio-2.1.4
> Starting 8 processes
>
> ssd: (groupid=0, jobs=8): err= 0: pid=9198: Tue Dec  3 18:40:41 2013
>   read : io=2545.1MB, bw=21725KB/s, iops=5431, runt=120002msec
> ....................
>
> However when I replay the .bin trace using read_iolog, the result
> shows only 1 job's results as below,
>
> Replay: (g=0): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=sync, iodepth=1
> fio-2.1.4
> Starting 1 process
>
> Replay: (groupid=0, jobs=1): err= 0: pid=12065: Tue Dec  3 18:56:00 2013
>   read : io=39792MB, bw=111409KB/s, iops=1740, runt=365742msec
>
> Any reason for why this is happening?
> Am I missing something here?
>
> These are my blktrace and parse commands I use
> blktrace -w 130 -d /dev/sdb -a read -b 4096 -o 4K_RR_Trace
> blkparse -i ./*.blktrace.0 -d ./bp.bin -o bp.txt -w 0:130
>
>
> Any pointers appreciated...
>
>
> Thanks
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