Memory part 5: What programmers can do [LWN.net]

Memory part 5: What programmers can do

Posted Oct 26, 2007 2:42 UTC (Fri) by avassalotti (subscriber, #45540)
Parent article: Memory part 5: What programmers can do

                Original        Transposed
    Cycles	16,765,297,870  3,922,373,010
    Relative	100%            23.4%

Through the simple transformation of the matrix we can achieve a 76.6% speed-up!

I could wrong, but I think that is a speedup of 427.4%, not 76.6%

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76.6% speedup

Posted Oct 27, 2007 21:32 UTC (Sat) by giraffedata (subscriber, #1954) [Link]

I think it's ambiguous. While it's clear that it's a 427% increase in speed and a 77% decrease in slowness, "speed-up" might refer to either of those, and also to the 77% reduction in execution time.

For practical use, I believe per centages of execution time are more useful than per centages of speed because time is the limited resource.