Ingo Molnar wrote:
CFS is fair even on SMP. Consider for example the worst-case
3-tasks-on-2-CPUs workload on a 2-CPU box:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2658 mingo 20 0 1580 248 200 R 67 0.0 0:56.30 loop
2656 mingo 20 0 1580 252 200 R 66 0.0 0:55.55 loop
2657 mingo 20 0 1576 248 200 R 66 0.0 0:55.24 loop
66% of CPU time for each task. The 'TIME+' column shows a 2% spread
between the slowest and the fastest loop after just 1 minute of runtime
(and the spread gets narrower with time).
Is there a way in CFS to tune the amount of time over which the load
balancer is fair? (Of course there would be some overhead involved.)
Chris
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