Simon Marlow has been a prominent figure in the Haskell community formany years. He is the author of large parts of the Glasgow HaskellCompiler, including in particular its highly regarded mulitcoreruntime system, along with many of the libraries and tools thatHaskell programmers take for granted. Simon also contributes to thefunctional programming research community, and has a...
Simon Marlow has been a prominent figure in the Haskell community formany years. He is the author of large parts of the Glasgow HaskellCompiler, including in particular its highly regarded mulitcoreruntime system, along with many of the libraries and tools thatHaskell programmers take for granted. Simon also contributes to thefunctional programming research community, and has a string of paperson subjects ranging from garbage collection to language design. Inrecent years Simon's focus has been on making Haskell an idealprogramming language for parallel and concurrent applications, both bydeveloping new programming models and building a high-qualityimplementation.
Simon spent 14 years at Microsoft's Research laborotory in Cambridge,before taking a break in Spring 2013 to work on this book. Hecurrently works at Facebook UK.
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A program that has a sequential portion like this can never achieve perfect speedup, and in fact we can calculate the maximum achievable speedup for a given number of cores using Amdahl’s law. Amdahl’s law gives the maximum speedup as the ratio:
1 / ((1 - P) + P/N)
where P is the portion of the runtime that can be parallelized, and N is the number of processors available. In our case, P is (0.76 - 0.0167)/0.76 = 0.978, and the maximum speedup is 1.96. The sequential fraction here is too small to make a significant impact on the theoretical maximum speedup with two processors, but when we have more processors, say 64, it becomes much more important: 1 / ((1-0.978) + 0.978/64) = 26.8. So no matter what we do, this tiny sequential part of our program will limit the maximum speedup we can o... (查看原文)
0 有用 到此一游 e/acc 2015-04-29 13:20:13
oreily的书一如既往的薄，读完编译器源码看会更明白，这个培训讲义不好写啊；
1 有用 luochen1990 2015-06-03 09:38:24
内容很全面，翻译有些瑕疵。
0 有用 holoto 2016-10-21 19:25:18
内容很丰富，不建议初学者阅读。