Martin Ohlin wrote:
Mike Galbraith wrote:
On Thu, 2006-08-31 at 06:53 +0000, Mike Galbraith wrote:
On Thu, 2006-08-31 at 11:07 +1000, Peter Williams wrote:
But your implication here is valid. It is better to fiddle with the
dynamic priorities than with nice as this leaves nice for its
primary purpose of enabling the sysadmin to effect the allocation of
CPU resources based on external considerations.
I don't understand. It _is_ the administrator fiddling with nice based
on external considerations. It just steadies the administrator's hand.
When extended to groups, I see your point. The admin would lose his
ability to apportion bandwidth _within_ the group because he's already
turned his only knob. That is going to be just as much of a problem for
other methods though, and is just a question of how much complexity you
want to pay to achieve fine grained control.
I do not see the problem. Let's say I create a group of three tasks and
give it 50% of the CPU bandwidth (perhaps by using the same nice value
for all the tasks in this group). If I then want to apportion the
bandwidth within the group as you say, then the same thing can be done
by treating them as individual tasks.
Maybe I am wrong, but as I see it, if one wants to control on a group
level, then the individual shares within the group are not that
important. If the individual share is important, then it should be
controlled on a per-task level. Please tell me if I am wrong.
It's not that the control can't be done using nice. It's that using
nice to do the control stops nice being used for its original purpose.
Some may not see that as a problem BUT some will.
Peter
--
Peter Williams [email protected]
"Learning, n. The kind of ignorance distinguishing the studious."
-- Ambrose Bierce
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