Yeah, the Scala code was a port of Java code that does similar things. With
the Scala command line and some other Scala tools, it's much faster to make
a change and test the change with Scala than with Java.
On 11/30/07, David MacIver <[EMAIL PROTECTED]> wrote:
>
>
> For what it's worth, the obvious Java translation does the same thing:
>
> class Foo{
> public static void main(String[] args){
> long bits = 0L;
> long start = System.currentTimeMillis();
> int n = 2000000001;
> while (n > 0) {
> bits ^= (1 << 5);
> n--;
> }
> System.out.println(bits);
> long end = System.currentTimeMillis();
> System.out.println(end-start);
>
> }
> }
>
> So it isn't a quirk of the bytecode scala produces
>
>
> On Nov 30, 2007 11:18 PM, Erik Engbrecht <[EMAIL PROTECTED]> wrote:
> > David,
> > For me 1.5 and 1.6 perform about the same...1.6 is a little faster.
> > However, -server yields the surprisingly fast results that you are
> seeing
> > under 1.6 and -client yields the slow results that you are seeing under
> 1.5.
> >
> > It still doesn't explain why it's so fast...but it's another data point.
> > I'm using an ancient computer with Linux.
> >
> > -Erik
> >
> >
> > On Nov 30, 2007 5:49 PM, David Pollak < [EMAIL PROTECTED]>
> > wrote:
> > > I've got the following Scala code:
> > > object Foo {
> > > def main(argv: Array[String]) {
> > > var bits = 0L
> > > val start = System.currentTimeMillis()
> > > var n = 2000000001
> > > // var n = 2000000001L // makes things very slow
> > > while (n > 0) {
> > > bits = bits ^ (1 << 5)
> > > n = n - 1
> > > }
> > > System.out.println(bits)
> > > val end = System.currentTimeMillis()
> > > System.out.println(end-start)
> > > }
> > > }
> > >
> > > I'm enclosing the source and the bytecode.
> > >
> > > There are 2B iterations.
> > >
> > > On my Core 2 Quad running JDK 1.6 (32 bit), the code takes 2 ms to
> run.
> > >
> > > On my Mac Book Pro (Core Duo, JDK 1.5) it takes 6,600 ms.
> > >
> > > The run time on the Mac seems more "reasonable". What's going on?
> > >
> > >
> > >
> > > --
> > > lift, the secure, simple, powerful web framework http://liftweb.net
> > > Collaborative Task Management http://much4.us
> > >
> > >
> >
> >
> >
> > --
> > http://erikengbrecht.blogspot.com/
> >
> >
> > >
> >
>
> >
>
--
lift, the secure, simple, powerful web framework http://liftweb.net
Collaborative Task Management http://much4.us
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