Implement solution to infeasible weights problem #129
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Signed-off-by: David Vernet <void@manifault.com>
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Updated to address bug where we'd sometimes fail to find an infeasible threshold. |
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htejun
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As described in [0], there is an open problem in load balancing called the "infeasible weights" problem. Essentially, the problem boils down to the fact that a task with disproportionately high load can be granted more CPU time than they can actually consume per their duty cycle. This patch implements a solution to that problem, wherein we apply the algorithm described in this paper to adjust all infeasible weights in the system down to a feasible wight that gives them their full duty cycle, while allowing the remaining feasible tasks on the system to share the remaining compute capacity on the machine. [0]: https://drive.google.com/file/d/1fAoWUlmW-HTp6akuATVpMxpUpvWcGSAv/view?usp=drive_link Signed-off-by: David Vernet <void@manifault.com>
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As described in this paper, there is an open problem in load balancing
called the "infeasible weights" problem. Essentially, the problem boils
down to the fact that a task with disproportionately high load can be
granted more CPU time than they can actually consume per their duty
cycle.
This patch implements a solution to that problem, wherein we apply the
algorithm described in this paper to adjust all infeasible weights in
the system down to a feasible wight that gives them their full duty
cycle, while allowing the remaining feasible tasks on the system to
share the remaining compute capacity on the machine.