Mike Galbraith wrote:
On Fri, 2006-06-02 at 23:18 +1000, Peter Williams wrote:
Mike Galbraith wrote:
On Fri, 2006-06-02 at 15:55 +1000, Peter Williams wrote:
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.
Similar in that they are both inherited. Very dissimilar in that the
effect of nice is not altered by fork whereas the effect of a cap is.
Consider make. A cap on make itself isn't meaningful, and _any_ per
task cap you put on it with the intent of managing the aggregate, is
defeated by the argument -j. Per task caps require omniscience to be
effective in managing processes. That's a pretty severe limitation.
These caps aren't trying to control aggregates but with suitable
software they can be used to control aggregates.
How? How would you deal with the make example with per task caps.
I'd build a resource management tool that uses task statistics, nice and
caps to manage CPU resource allocation. This could be a plug in kernel
module or a user space daemon. It doesn't need to be in the scheduler.
Peter
--
Peter Williams [email protected]
"Learning, n. The kind of ignorance distinguishing the studious."
-- Ambrose Bierce
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