Why not give AmdahlCalc a try? You can, if you click this button:
(and then you can read all about it...)
Why not give AmdahlCalc a try? You can, if you click this button:
(and then you can read all about it...)
AmdahlCalc is an interactive JavaScript utility that estimates the maximum speedup for parallel programs (given two timings - single-processor and p processors, where you choose p), using Amdahl's Law. The results are shown in tabular form and (optionally) as a column graph.
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?).
Running AmdahlCalc
You'll need a JavaScript-enabled web browser (Netscape Navigator or Internet
Explorer versions 4 and higher, Opera, Mozilla, etc) to use AmdahlCalc.
Click
here
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
the results.
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;">
PerfSuite AmdahlCalc</a>