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However, this approach started breaking down as we gained more students and our other responsibilities increased: our time became fragmented and inefficiently used; hard-earned lessons were not shared effectively among students; and our group lacked any real cohesion or identity. In September 2006, we learned about Scrum,1 an “agile” software development methodology, and realized we might be able to solve some of the problems we were having by adapting it to our research group. In this Viewpoint, we briefly describe the resulting process, which we call SCORE (SCrum fOr REsearch).

5 3 | n o. 1 0 | c o m m u n i c at i o ns o f t he acm 37 practice me are going to need that if we’re to take advantage of these kinds of architectural innovations? COLE: As we develop specialty hardware, be it GPUs or network engines, the machine is becoming essentially a federation of processing elements designed to handle specific tasks. The graphics processor was highly tuned for doing its job of displaying pixels and performing certain mathematical functions that are important to the graphics guys and the gamers.

You can not do both simultaneously. Somewhere in between—at some load level (that is, at some utilization value)—is the optimal load for the system. The utilization value at which this optimal balance occurs is called the knee. This is the point at which Table 1. M/M/m knee values for common values of m. Service channel count 1 Knee utilization 50% 2 57% 4 66% 8 74% 16 81% 32 86% 64 89% 128 92% throughput is maximized with minimal negative impact to response times. (I am engaged in an ongoing debate about whether it is appropriate to use the term knee in this context.

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