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From "Vladimir Strigun (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-4552) [drlvm][jit][perf]instanceof operation works slowly in server mode
Date Thu, 26 Jul 2007 12:58:40 GMT
[drlvm][jit][perf]instanceof operation works slowly in server mode

                 Key: HARMONY-4552
                 URL: https://issues.apache.org/jira/browse/HARMONY-4552
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
            Reporter: Vladimir Strigun

The test below shows that instanceof significantly slower in comparison win Sun. 

Results of test execution:
java client: 2500 msec
java server: 31 msec 
harmony server: 4000 msec

Small test:
public class Test {
    public static void main(String[] args) {
        runTest(1000, new String());
        long start = System.currentTimeMillis();
        runTest(1000000000, new String());
        long end = System.currentTimeMillis() - start;
        System.out.println("completed in "+end);

    public static void runTest(int num, Object obj) {
        for(int i=0; i<num; i++) {
            if(obj instanceof String){} 

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