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I'd never heard of him. He's done a lot of interesting stuff, mostly in high performance computing. From his personal page:

"Gustafson has recently finished writing a book, The End of Error: Unum Computing, that presents a new approach to computer arithmetic: the unum. The universal number, or unum format, encompasses all IEEE floating-point formats as well as fixed-point and exact integer arithmetic. This approach obtains more accurate answers than floating-point arithmetic yet uses fewer bits in many cases, saving memory, bandwidth, energy, and power."

Has anybody read it?

https://www.amazon.com/dp/1482239868




Among other things he is famous for what came to be called Gustafson’s law:

http://www.johngustafson.net/pubs/pub13/amdahl.htm

“Speedup should be measured by scaling the problem to the number of processors, not fixing problem size”



I only heard of him recently and just went through his presentation about Unums, available on his page. Great stuff, highly recommended.

http://www.johngustafson.net/presentations/Unums2.0.pdf




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