Scalability! But at what COST?
http://www.frankmcsherry.org/assets/COST.pdfA paper dissecting the notion of scalability and measurements of scalability in 'big data' systems. They define a metric, the Configuration that Outperforms a Single Thread, which is particularly aimed at giving meaningful comparisons, or: "without rewarding systems that bring substantial but parallelizable overheads".
There is a less academic overview on The Morning Paper: https://blog.acolyer.org/2015/06/05/scalability-but-at-what-cost/
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