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 :)
[neug...@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
[neug...@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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package net.java.openjdk;
import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
/**
* Very simple microbenchmark to test performance impact in changes
* caused by OpenJDK bug #100068.
*
* @author Mario Torre <neug...@aicas.com>
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
BufferedImage bimg =
new BufferedImage(100, 100, BufferedImage.TRANSLUCENT);
Graphics2D g = bimg.createGraphics();
long _start = System.currentTimeMillis();
for (int i = 0; i < 100000; i++) {
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_OFF);
g.fillRect(0,0,1,1);
}
for (int i = 0; i < 100000; i++) {
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_OFF);
g.fillRect(0,0,1,1);
}
long start = System.currentTimeMillis();
for (int i = 0; i < 100000; i++) {
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_OFF);
g.fillRect(0,0,1,1);
}
long stop = System.currentTimeMillis();
System.out.println("warmed up run time in ms: " + (stop - start));
System.out.println("total time in ms: " + (stop - _start));
}
}
