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From "Vladimir Strigun (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-4553) [drlvm][jit][perf]String.compareTo method works slowly
Date Thu, 26 Jul 2007 13:00:49 GMT
[drlvm][jit][perf]String.compareTo method works slowly
------------------------------------------------------

                 Key: HARMONY-4553
                 URL: https://issues.apache.org/jira/browse/HARMONY-4553
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
            Reporter: Vladimir Strigun


The test below shows that String.compareTo(String) method significantly slower in comparison
win Sun. 

Results of test execution:
java client: 1700 msec
java server: 0 
harmony server: 3360 msec


Small test:
public class CompareToTest{
    public static void main(String[] args){
        String st1 = new String("0 1 2 3 4 5 6 7 8 9");
        String st2 = new String("0 1 2 3 4 5 6 7 8 9");
        //warmup VM
        stringCompareTo(st1, st2, 100000);
        long start = System.currentTimeMillis();
        stringCompareTo(st1, st2, 20000000);
        long end = System.currentTimeMillis() -start;
        System.out.println("String compareTo for equals strings completed in "+end +" msec");
        st1 = new String("0 1 2 3 4 5 6 7 8 9abc");
        //warmup VM
        stringCompareTo(st1, st2, 100000);
        long start1 = System.currentTimeMillis();
        stringCompareTo(st1, st2, 20000000);
        long end1 = System.currentTimeMillis() -start1;
        System.out.println("String compareTo for non equals strings completed in "+end1 +"
msec");

        System.out.println("Total in "+(end1+end) +" msec");

    }

    public static void stringCompareTo(String st1, String st2, int num){
        for(int x=0; x<num; x++) {
            st1.compareTo(st2);
        }

    }
}

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