Re: Specify range and distribution of accesses

[Jens Axboe <axboe@kernel.dk>]

On 03/07/2016 01:46 PM, Jeff Furlong wrote:
> Thanks for the suggestions and patches.  Using the latest fio version, the JESD219 workload is possible:
>
> # fio -version
> fio-2.6-27-gd283
>
> # fio --name=JESD219 --ioengine=libaio --direct=1 --rw=randrw --norandommap --randrepeat=0 --rwmixread=40 --rwmixwrite=60 --iodepth=256 --size=100% --numjobs=4 --bssplit=512/4:1024/1:1536/1:2048/1:2560/1:3072/1:3584/1:4k/67:8k/10:16k/7:32k/3:64k/3 --random_distribution=zoned:50/5:30/15:20/80 --overwrite=1 --filename=/dev/nvme0n1 --group_reporting --runtime=5m --time_based --output=JESD219
>
> A quick statistical analysis of the results shows:
>
> Found 20380582 IOs
>
>   Found 39.9903152913% reads
>   Found 60.0096847087% writes
>
>   Found 4.00492979052% 512
>   Found 1.00495658073% 1024
>   Found 1.00079575745% 1536
>   Found 1.00046701316% 2048
>   Found 0.998764412125% 2560
>   Found 0.998043137335% 3072
>   Found 0.999520033334% 3584
>   Found 67.0145778958% 4096
>   Found 9.98662844859% 8192
>   Found 6.99898560306% 16384
>   Found 2.99961993235% 32768
>   Found 2.99271139558% 65536
>
>   Found 49.9895734086% 0-5%
>   Found 30.0126463513% 5-20%%
>   Found 19.99778024% 20-100%
>
> So we can confirm (with a reasonable tolerance) that the read/write distribution, the blocksize distribution, and the zoned distribution hold true.  Feel free to modify the fio cmd for your actual JESD219 workload (duration, logs, etc.).

Thanks for posting this Jeff, looks great!

-- 
Jens Axboe