[Devel] Re: cgroups and limit firefox processes cpu time

[Dhaval Giani]

On Fri, Jan 22, 2010 at 12:36 PM, Balbir Singh
<balbir at linux.vnet.ibm.com> wrote:
> On Friday 22 January 2010 05:03 PM, william wrote:
>> Balbir Singh wrote:
>>> On Friday 22 January 2010 11:04 AM, william wrote:
>>>
>>>> Hello list
>>>>
>>>> I have a question about how i can limit the cpu for a firefox process on
>>>> a terminal server.
>>>>
>>>> We have 150 firefox processes running on a terminalserver but there are
>>>> always people who take more cpu when they use flash or java.
>>>> Some firefox processes take sometimes about 50 percent cpu time.
>>>> Is there a way to give all firefox processes equal cpu shares so that
>>>> other people who are using firefox for research have no issues (slow
>>>> responding scrolling and menu)  because there are a few firefox
>>>> processes eating all the cpu time?
>>>>
>>>
>>> Are these running on behalf of different users? You can always create a
>>> good hiearchy and organize. FAIR_USER scheduler option is going away
>>> soon. Some more context on the firefox applications and whose behalf
>>> they are running on, etc would help.
>>>
>>>
>>>
>> The terminal server only hosts firefox processes for different users
>> (user is only allowed to login once) to provide internet access in a
>> secure way.
>>
>> So i have 150 firefox processes for different users. So i cannot set one
>> group, I have to put all those processes in a separate container if i
>> get it right?
>
> If the kernel is compiled with fair users then you are set, but that
> option might go away soon.

I have already posted a patch to remove it, and it will go away in the
next release of the kernel

> Yes, putthing them all in their own cgroup is
> the best option. This can be done easily using libcgroup tools.
>

Right, libcgroup already has the ability to sort on the basis of
username and process name. You should be able to use that. Though it
might be impractical at the moment since you will need to list all the
usernames/groups in a configuration file.

Thanks,
Dhaval
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