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Date: Mon, 21 Jul 2014 22:54:43 +0200
From: Jens Axboe <axboe@kernel.dk>
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Subject: Re: fio hangs with --status-interval
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To: Vasily Tarasov <tarasov@vasily.name>
Cc: Michael Mattsson <michael.mattsson@gmail.com>, "fio@vger.kernel.org" <fio@vger.kernel.org>
List-ID: <fio@vger.kernel.org>

On 2014-07-21 22:25, Vasily Tarasov wrote:
> Hi Jens,
>
> I tried your patch, but it didn't help. Interestingly, the number of
> threads changes in the end. At first, during the run:
>
> # ps -eLf | grep fio
> root      5224  4274  5224  1    2 11:12 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5225  0    2 11:12 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5231  5224  5231 60    1 11:12 ?        00:00:07 fio
> --status-interval 10 --minimal fios/1.fio
> root      5260  5237  5260  0    1 11:12 pts/0    00:00:00 grep fio
> [root@bison01 vass]# ps -eLf | grep fio
> root      5224  4274  5224  0    2 11:12 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5225  0    2 11:12 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5231  5224  5231 16    1 11:12 ?        00:00:21 fio
> --status-interval 10 --minimal fios/1.fio
> root      5293  5237  5293  0    1 11:14 pts/0    00:00:00 grep fio
> [root@bison01 vass]# ps -eLf | grep fio
> root      5224  4274  5224  0    2 11:12 pts/1    00:00:01 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5225  0    2 11:12 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5231  5224  5231 12    1 11:12 ?        00:01:13 fio
> --status-interval 10 --minimal fios/1.fio
> root      5411  5237  5411  0    1 11:22 pts/0    00:00:00 grep fio
>
> Later, when the threads are stuck:
>
> # ps -eLf | grep fio
> root      5224  4274  5224  0   16 11:12 pts/1    00:00:02 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5225  0   16 11:12 pts/1    00:00:01 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5458  0   16 11:25 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5459  0   16 11:25 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5460  0   16 11:25 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5461  0   16 11:25 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5462  0   16 11:25 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5471  0   16 11:25 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5472  0   16 11:26 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5475  0   16 11:26 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5476  0   16 11:26 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5477  0   16 11:26 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5478  0   16 11:26 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5487  0   16 11:26 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5488  0   16 11:27 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      5224  4274  5489  0   16 11:27 pts/1    00:00:00 fio
> --status-interval 10 --minimal fios/1.fio
> root      6665  5237  6665  0    1 13:21 pts/0    00:00:00 grep fio
>
> Is the number of threads supposed to change?..
>
> Here is the fio file I'm using:
>
> <snip starts>
> # cat fios/1.fio
> [global]
> rw=write
> bs=8m
> direct=0
>
> [sdaa]
> filename=/dev/sdaa
> <snip ends>
>
> Command line is
>
> fio --status-interval 10 --minimal fios/1.fio

Thanks, I'll try and reproduce it tomorrow.

-- 
Jens Axboe