throttle IO to multiple devices in one group

throttle IO to multiple devices in one group

[Guang Yang]

Hello,
We are evaluating to use cgroups to isolate different applications on
Linux. One use case of our application is that it reads/writes to
multiple block devices and we would like throttle the IO for each
application to each devices via blkio.throttle.read_iops_device.
However, it looks like each group can only configure one device.

Am I miss anything? Is there a way to support such semantic - limit
the number of reads to multiple devices within one group?

Thanks very much.

Re: throttle IO to multiple devices in one group

[Nikolay Borisov]

On 09/09/2016 02:32 AM, Guang Yang wrote:
> Hello,
> We are evaluating to use cgroups to isolate different applications on
> Linux. One use case of our application is that it reads/writes to
> multiple block devices and we would like throttle the IO for each
> application to each devices via blkio.throttle.read_iops_device.
> However, it looks like each group can only configure one device.
> 
> Am I miss anything? Is there a way to support such semantic - limit
> the number of reads to multiple devices within one group?
> 
> Thanks very much.
> --
> To unsubscribe from this list: send the line "unsubscribe cgroups" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 


[root@kernighan c11]# cat blkio.throttle.read_bps_device 
[root@kernighan c11]# echo "253:12 1600000" > blkio.throttle.read_bps_device
[root@kernighan c11]# echo "253:13 1600000" >> blkio.throttle.read_bps_device
[root@kernighan c11]# cat blkio.throttle.read_bps_device
253:13 1600000
253:12 1600000


It works just fine (this is on 4.4 kernel though)

Regards, 
Nikolay 

Re: throttle IO to multiple devices in one group

[Guang Yang]

Thanks for the reply, Nikolay. It works for me with 2.6.32 kernel too.

Thanks,
Guang

On Thu, Sep 8, 2016 at 11:29 PM, Nikolay Borisov <kernel-6AxghH7DbtA@public.gmane.org> wrote:
>
>
> On 09/09/2016 02:32 AM, Guang Yang wrote:
>> Hello,
>> We are evaluating to use cgroups to isolate different applications on
>> Linux. One use case of our application is that it reads/writes to
>> multiple block devices and we would like throttle the IO for each
>> application to each devices via blkio.throttle.read_iops_device.
>> However, it looks like each group can only configure one device.
>>
>> Am I miss anything? Is there a way to support such semantic - limit
>> the number of reads to multiple devices within one group?
>>
>> Thanks very much.
>> --
>> To unsubscribe from this list: send the line "unsubscribe cgroups" in
>> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
>
>
> [root@kernighan c11]# cat blkio.throttle.read_bps_device
> [root@kernighan c11]# echo "253:12 1600000" > blkio.throttle.read_bps_device
> [root@kernighan c11]# echo "253:13 1600000" >> blkio.throttle.read_bps_device
> [root@kernighan c11]# cat blkio.throttle.read_bps_device
> 253:13 1600000
> 253:12 1600000
>
>
> It works just fine (this is on 4.4 kernel though)
>
> Regards,
> Nikolay