Re: [Xen-devel] Java Problems

[Peter <peter@xxxxxxxxxxxxxxx>]

Hi.

I don't have a 2.0.7 to test on at the moment.  I will try again when I do.

I got rid of the object allocation inside the loop.  And I retested.  I 
don't hit the problem with int's on the call stack.  I do hit the 
problem with floats and doubles.
The problem is quite easily reproducible (for me).  Is someone there 
with knowledge of register/stack handle able to take a look with gdb or 
which ever tool you use?
Regards, Peter
http://rimuhosting.com - Xen VPS Hosting


public class FillTest {
    public static void main(String[] args) {
        System.out.println("Starting");
        foo f = new foo();
        for (int i = 0;i<100000000; i++) {
            f.iter = i;
            f.test();
        }
    }
    public static class foo {
        int iter;
        float f = 0.75f;
        int i=1;
        double d = 0.75d;
        void test() {
            testI(i);
            testD(d);
            test(f);
        }
        void test(float f1) {
            if(f1!=f) {
                throw new RuntimeException("float value mismatch: " + 
f1 + " vs " + f + " at iteration " + iter);
            }
        }
        void testI(int fi) {
            if(fi!=i) {
                throw new RuntimeException("int value mismatch: " + fi 
+ " vs " + i + " at iteration " + iter);
            }
        }
        void testD(double fd) {
            if(fd!=d) {
                throw new RuntimeException("double value mismatch: " + 
fd + " vs " + d + " at iteration " + iter);
            }
        }
    }
}


Starting
Exception in thread "main" java.lang.RuntimeException: double value 
mismatch: 0.                                      75 vs 0.75 at 
iteration 3981054
        at FillTest$foo.testD(FillTest.java:33)
        at FillTest$foo.test(FillTest.java:18)
        at FillTest.main(FillTest.java:8)
Starting
Starting
Exception in thread "main" java.lang.RuntimeException: double value 
mismatch: Na                                      N vs 0.75 at iteration 
33238270
        at FillTest$foo.testD(FillTest.java:33)
        at FillTest$foo.test(FillTest.java:18)
        at FillTest.main(FillTest.java:8)
Starting
Exception in thread "main" java.lang.RuntimeException: double value 
mismatch: 0.75                                     vs 0.75 at iteration 
43731162
        at FillTest$foo.testD(FillTest.java:33)
        at FillTest$foo.test(FillTest.java:18)
        at FillTest.main(FillTest.java:8)
Starting
Exception in thread "main" java.lang.RuntimeException: double value 
mismatch: 0.75 vs 0.75 at iteration 26104068
        at FillTest$foo.testD(FillTest.java:33)
        at FillTest$foo.test(FillTest.java:18)
        at FillTest.main(FillTest.java:8)
Starting
Exception in thread "main" java.lang.RuntimeException: double value 
mismatch: 0.75 vs 0.75 at iteration 350370
        at FillTest$foo.testD(FillTest.java:33)
        at FillTest$foo.test(FillTest.java:18)
        at FillTest.main(FillTest.java:8)
Starting


Reuben Kabel wrote:
> Does the following code exhibit the same problem? I've modified it so it
> doesn't try to allocate many foo instances within the loop.
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