Ask List wrote:
Have an issue maybe someone on this list can help with.
At times of very high load the number of processes on the run queue drops to
0 then jumps really high and then drops to 0 and back and forth. It seems to
last 10 seconds or so. If you look at this vmstat you can see an example of
what I mean. Now im not a linux kernel expert but i am thinking it has
something to do with the scheduling algorithm and locking of the run queue.
For this particular application I need all available threads to be processed as
fast as possible. Is there a way for me to elimnate this behavior or at least
minimize the window in which there are no threads on the run queue? Is there a
sysctl parameter I can use?
Please help.
This seems like a userspace issue to me. There is no way the scheduler
would let the system sit idle for 10 seconds with runnable processes. I
think Rik van Riel's comment about sendmail reacting to increased load
average may be related to what's going on here.
--
Robert Hancock Saskatoon, SK, Canada
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Home Page: http://www.roberthancock.com/
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