Why not give AmdahlCalc a try? You can, if you click this button:
(and then you can read all about it...)
It also optionally recommends a processor count for the program by minimizing the value:
One way to think about this is that it asks, "what is the cost,
in aggregate processor-time, per unit of speedup?". (If the
computer was a car, we'd be talking gallons-per-mile).
The assumption is that all processors are dedicated to
the application and are idle during serial portions of the program.
It would be interesting
to use different metrics (any ideas?).
Explorer versions 4 and higher, Opera, Mozilla, etc) to use AmdahlCalc.
to give it a try - a window will open on your display that is the
AmdahlCalc user interface.
All you're required to do is to fill in the form with two
numbers: your measured or estimated
timings for one processor and p processors (by default, p
is set to 2, but you can modify that field). Once you've entered
the timings and the correct processor count (and specified any other
options you'd like), just click on the
button labeled "Run AmdahlCalc" and you'll receive
Accessing AmdahlCalc From Your Page
Save this button (right-click on it and select "Save Picture As..." or "Save
Image As..." in your browser):
<a href="#" onClick="window.open('http://perfsuite.ncsa.uiuc.edu/AmdahlCalc/','amdahl','scrollbars,status,resizable,width=580,height=640');return false;"> <img src="amdahlcalc.gif" alt="PerfSuite AmdahlCalc"></a>If you name the button something other than "amdahlcalc.gif", use that name instead. If you save it in a different directory than where your web page is located, you'll have to adjust the path in the "img src=" part accordingly.
If you don't want to use the button, then use the following:
<a href="#" onClick="window.open('http://perfsuite.ncsa.uiuc.edu/AmdahlCalc/','amdahl','scrollbars,status,resizable,width=580,height=640');return false;">