Hello folks,

I was comparing the Sun Java Virtual Machine against the old Microsoft
one, and I found that it is slower for int and double multiplication
than the MS JVM.

The values I found are the following, where the computer has a Duron
1300 MHz processor and 256 MB of RAM:

         SUN          SUN           MICROSOFT
       1.4.2_04     1.5.0_04        5.0.0.3810
int      20590        21140            13290
double   18950        21090            10710
long     36080        35540            40700

It appears that there is much room for improvement in the Sun JVM
given that the MS JVM is very old.

The programs are shown below:
================================================================
public class test1
{
 public static void main(String args[])
 {
   int i,j;
   double [] pepe = new double [200];
   long k = System.currentTimeMillis();
   for (j=0; j<10000000; j++)
   {
     for (i=0; i<200; i++)
     {
       pepe[i] = 5647239564d;
     }
     for (i=0; i<200; i++)
     {
       pepe[i] = pepe[i] * 657805890d;
     }
   }
   System.out.println(System.currentTimeMillis() - k);
 }
}

================================================================
public class test2
{
 public static void main(String args[])
 {
   int i,j;
   long [] pepe = new long [200];
   long k = System.currentTimeMillis();
   for (j=0; j<10000000; j++)
   {
     for (i=0; i<200; i++)
     {
       pepe[i] = 5647239564l;
     }
     for (i=0; i<200; i++)
     {
       pepe[i] = pepe[i] * 657805890l;
     }
   }
   System.out.println(System.currentTimeMillis() - k);
 }
}
===========================================================
public class test3
{
 public static void main(String args[])
 {
   int i,j;
   int [] pepe = new int [200];
   long k = System.currentTimeMillis();
   for (j=0; j<10000000; j++)
   {
     for (i=0; i<200; i++)
     {
       pepe[i] = 56472395;
     }
     for (i=0; i<200; i++)
     {
       pepe[i] = pepe[i] * 65780589;
     }
   }
   System.out.println(System.currentTimeMillis() - k);
 }
}

Best regards,

Dario Alpern
Buenos Aires - Argentina