Proceedings of the 10th Workshop on Programming Languages and Operating Systems 2019
DOI: 10.1145/3365137.3365400
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Fork/Wait and Multicore Frequency Scaling

Abstract: The complexity of computer architectures has risen since the early years of the Linux kernel: Simultaneous Multi-Threading (SMT), multicore processing, and frequency scaling with complex algorithms such as Intel ® Turbo Boost have all become omnipresent. In order to keep up with hardware innovations, the Linux scheduler has been rewritten several times, and many hardware-related heuristics have been added. Despite this, we show in this paper that a fundamental problem was never identified: the POSIX process cr… Show more

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“…The lower performance of CFS is due to the work conservation issue on a new event highlighted in Section 4.3. To identify the issue, we recorded and compared the size of the runqueues using the scheduler profiling tools SchedLog and SchedDisplay that we developed in previous work [9]. Figure 5a shows the beginning of the execution of FT under CFS which is representative of the placement problem.…”
Section: Nas: Solving Work-conservation Issuesmentioning
confidence: 99%
“…The lower performance of CFS is due to the work conservation issue on a new event highlighted in Section 4.3. To identify the issue, we recorded and compared the size of the runqueues using the scheduler profiling tools SchedLog and SchedDisplay that we developed in previous work [9]. Figure 5a shows the beginning of the execution of FT under CFS which is representative of the placement problem.…”
Section: Nas: Solving Work-conservation Issuesmentioning
confidence: 99%