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Paper summary: The Linux Scheduler: a Decade of Wasted Cores by J.-P. Lozi et al. The authors found issues with the Completely Fair Scheduler on a NUMA system with 64 cores that kept cores idle while tasks were waiting to be executed. Fixing these problems resulted in a 138 times speedup in an extreme case.
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Paper summary: Finding a needle in Haystack: Facebook's photo storage by D. Beaver et al. It describes how they deal with the long tail of requests that are not cached by the CDNs.