[OpenJDK 2D-Dev] Review Reqeust for Bug 100068 - SunGraphics2D exposes a reference to itself while non fully initialised

[Mario Torre]

Il 14/07/2009 21:07, Jim Graham ha scritto:

> I would set the AA hint or set the composite - one or the other - but
> not both. Basically you are looking for the minimum action that causes
> an invalidation/revalidation cycle in order to measure the impact. The
> more extraneous work in the inner loop, the less impact you will notice
> from any overhead the new code might have added.
>
>> In both cases I was using debug build (as make debug_build) on an
>> Intel Core2 Duo T8300 running at full speed (2.40GHz).
>
> I would also compare optimized to optimized as the debug build probably
> adds a bit of overhead on its own - again, which could mask any overhead
> your changes might have added.
>
>> Maybe I should run a more scientific test, but this doesn't look too
>> bad to me :)
>
> True - it's a nice quick check result, but to be sure it should be done
> with minimal test overhead on an optimized build...
>
> ...jim

Yes boss :)

[neugens at galactica OpenJDKPerformaceTest]$ 
../openjdk/build/linux-amd64/bin/java -cp build/classes/ 
net.java.openjdk.Main
warmed up run time in ms: 32
total time in ms: 144

[neugens at galactica OpenJDKPerformaceTest]$ 
../openjdk-proxy/build/linux-amd64/bin/java -cp build/classes/ 
net.java.openjdk.Main
warmed up run time in ms: 31
total time in ms: 157

I did various run of this guy, the results are similar, the range of the 
total time goes from 144 to 158 basically for both OpenJDK version, but 
the warmed up time is always around 30-32 ms for both, so I don't see 
any performance degradation.

Btw, the non debug build is *fast*, I never realised this because I'm 
too used to run debug enabled code, that hotspot does magics is known, 
but this difference is quite amazing...

I attached the test case but, of course, is really simple. I'm going to 
do a test run with some real app too, like NetBeans :). The Java2D demo 
isn't really the fastest thing on Earth with any *JDK version I tried, 
so it may not be the best use case to spot for performance issues.

Cheers,
Mario
-- 
Mario Torre, Software Developer, http://www.jroller.com/neugens/
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