[Beowulf] How does one calculate the scalability of one's code?

Greg Lindahl lindahl at pathscale.com
Wed Jun 9 18:58:57 EDT 2004


> 1) Fixed job size
> 
> For Fixed job size, I can use Amdahl's law S = N/ (b * N + (1-b)) and fit
> the curve to find b ( the % of code that is serial)
> 
> Or I could use the Gustafson-Baris Law S = N - b(N - 1) and likewise fit to
> find b

Look at your curve -- I bet that it doesn't really look like either
equation. Both versions leave out the time spent communicating.

-- greg
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