Re: [ckrm-tech] [RFC 3/5] sched: Add CPU rate hard caps

[Peter Williams <pwil3058@bigpond.net.au>]

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Chandra Seetharaman wrote:
> On Thu, 2006-06-01 at 14:04 +0530, Balbir Singh wrote:
>> Hi, Kirill,
>>
>> Kirill Korotaev wrote:
>>>> Do you have any documented requirements for container resource 
>>>> management?
>>>> Is there a minimum list of features and nice to have features for 
>>>> containers
>>>> as far as resource management is concerned?
>>> Sure! You can check OpenVZ project (http://openvz.org) for example of 
>>> required resource management. BTW, I must agree with other people here 
>>> who noticed that per-process resource management is really useless and 
>>> hard to use :(
> 
> I totally agree.

"nice" seems to be doing quite nicely :-)

To me this capping functionality is a similar functionality to that 
provided by "nice" and all that's needed to make it useful is a command 
(similar to "nice") that runs tasks with caps applied.  To that end I've 
written a small script (attached) that does this.  As this is something 
that a user might like to combine with "nice" the command has an option 
for setting "nice" as well as caps.

Usage:
         withcap [options] command [arguments ...]
         withcap -h
Options:
         [-c <CPU rate soft cap>]
         [-C <CPU rate hard cap>]
         [-n <nice value>]

         -c Set CPU usage rate soft cap
         -C Set CPU usage rate hard cap
         -n Set nice value
         -h Display this help

Peter
-- 
Peter Williams                                   pwil3058@bigpond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
  -- Ambrose Bierce

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