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From "Mikhail Fursov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-4552) [drlvm][jit][perf]instanceof operation works slowly in server mode
Date Fri, 27 Jul 2007 08:57:18 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-4552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12515993
] 

Mikhail Fursov commented on HARMONY-4552:
-----------------------------------------

Here is my numbers for this test 

SUN 1.5_06
java Test: 2200
java -server Test: 0  (method is inlined and loop is eliminated??)

Harmony:
-Xem:jet:  9000
-Xem:opt  9000
-Xem:server: 3400
-Xem:server -XX:jit.arg.optimizer=off: 1600

These are very interesting results. We need to carefully analyze affects of
1) loop peeling
2) loop unrolling
3) copy propagation
4) instanceof helper inlining
5) CG optimization for instanceof check
may be some other optimization I missed here.

I can provide help here from JIT side, but afraid I will not have a time in the nearest 2
weeks to work on this issue by myself.






> [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
>            Assignee: Mikhail Fursov
>
> 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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