Dmitry Adamushko wrote:
On 18/05/07, Peter Williams <[email protected]> wrote:
[...]
One thing that might work is to jitter the load balancing interval a
bit. The reason I say this is that one of the characteristics of top
and gkrellm is that they run at a more or less constant interval (and,
in this case, X would also be following this pattern as it's doing
screen updates for top and gkrellm) and this means that it's possible
for the load balancing interval to synchronize with their intervals
which in turn causes the observed problem. A jittered load balancing
interval should break the synchronization. This would certainly be
simpler than trying to change the move_task() logic for selecting which
tasks to move.
Just an(quick) another idea. Say, the load balancer would consider not
only p->load_weight but also something like Tw(task) =
(time_spent_on_runqueue / total_task's_runtime) * some_scale_constant
as an additional "load" component (OTOH, when a task starts, it takes
some time for this parameter to become meaningful). I guess, it could
address the scenarios your have described (but maybe break some others
as well :) ...
Any hints on why it's stupid?
Well that is the kind of thing I was hoping to avoid for the reasons of
complexity. I think that the actual implementation would be more
complex than it sounds and possibly require multiple runs down the list
of moveable tasks which would be bad for overhead.
Basically, I don't think that the problem is serious enough to warrant a
complex solution. But I may be wrong about how complex the
implementation would be.
Peter
--
Peter Williams [email protected]
"Learning, n. The kind of ignorance distinguishing the studious."
-- Ambrose Bierce
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