Can someone explain to me the advantage of JIT compilers? It's obviously
faster .. I've been doing some recusion testing and the Sun JDK 1.3 for
Linux
runs on average 3 times faster than the jdk 1.2.2 rc4 from blackdown.org.
Here's my very simple nchoosek recursive method:
/** nchoosek recursive function **/
public class nchoosek {
public static void main(String[] args) {
if(args.length<2) return;
int n=Integer.parseInt(args[0]);
int k=Integer.parseInt(args[1]);
nchoosek func = new nchoosek();
long start = System.currentTimeMillis();
System.out.println(func.choose(n,k));
long end = System.currentTimeMillis();
System.out.println("took " + (end-start) +
"milliseconds (~" +
(float)(end-start)/1000 +
" seconds) !!");
}
public int choose(int n, int k) {
if(k==0) return 1;
if(n==1) return n;
if(n==k) return 1;
return choose(n-1,k) + choose(n-1,k-1);
}
}
Machine: Pentium Pro 200Mhz w/ 128Mb of RAM:
-On jdk 1.2.2 rc4 by blackdown ~10 seconds
-On jdk 1.2.2 by Sun for Linux ~28 seconds
-On jdk 1.3 by Sun for Linux ~3 seconds!
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