Date: Fri, 1 Dec 2000 11:12:11 -0700 (MST) From: Nate Williams <nate@yogotech.com> To: Ernst de Haan <ernst@jollem.com> Cc: "Koster, K.J." <K.J.Koster@kpn.com>, FreeBSD Java mailing list <freebsd-java@FreeBSD.ORG> Subject: Re: Performance hint for JDK on FreeBSD Message-ID: <14887.59899.440931.811907@nomad.yogotech.com> In-Reply-To: <20001201190827.A59487@c187104187.telekabel.chello.nl> References: <59063B5B4D98D311BC0D0001FA7E4522026D7A7D@l04.research.kpn.com> <20001201174923.A57144@c187104187.telekabel.chello.nl> <20001201185031.A58178@c187104187.telekabel.chello.nl> <20001201190827.A59487@c187104187.telekabel.chello.nl>
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> Ok, the votes are counted, the results are in :) I've written a small Java
> program I wrote to produce new test results that should be reproducable on
> other (FreeBSD) systems too. I've included the .java file in an attachment,
> and, for your convenience, the AWTTest.class file.
For those of us who are absolutely paranoid, can you send the original
.java file? I *hate* running binaries on my system that I know nothing
about. (No offense, to Ernst in implying that he's trying to breakin).
Also, having the source allows it to be used for profiling when we do
additional ports and such.
Thanks!
Nate
> Ernst de Haan wrote:
> > Heya Kees-Jan and all,
> >
> >
> > > > I never knew that it is a 400% performance boost, which does sound a little
> > > > strange. I'm really curious why that is.
> > >
> > > Well, I turned on profiling, and found that most of the time is spent in X11
> > > specific Java code. I will re-run the tests after I temporarily disabled your
> > > suggested modifications.
> >
> > Okay, I did a little profiling (using -Xrunhprof:cpu=times). This is the top
> > 10 when I dont have the modified font.properties file:
> >
> > CPU TIME (ms) BEGIN (total = 29358) Fri Dec 1 17:55:12 2000
> > rank self accum count trace method
> > 1 24.71% 24.71% 253952 1304 sun/io/CharToByteSingleByte.getNative
> > 2 16.04% 40.76% 8188 1399 sun/io/CharToByteSingleByte.convert
> > 3 12.93% 53.69% 253952 182 java/lang/String.charAt
> > 4 2.25% 55.94% 8184 620 java/lang/Throwable.fillInStackTrace
> > 5 1.44% 57.38% 8258 938 java/lang/String.<init>
> > 6 1.33% 58.71% 1 1275 sun/awt/font/NativeFontWrapper.registerFonts
> > 7 1.21% 59.93% 8184 867 java/lang/Throwable.<init>
> > 8 1.08% 61.01% 10958 153 java/io/StreamTokenizer.read
> > 9 1.07% 62.08% 10958 623 java/io/BufferedInputStream.read
> > 10 0.91% 62.99% 318 123 java/util/Properties.loadConvert
> >
> > The traces for the top 3 are:
> >
> > TRACE 1304:
> > sun/io/CharToByteSingleByte.getNative
> > sun/io/CharToByteSingleByte.convert
> > sun/awt/font/NativeFontWrapper.registerFonts
> > sun/awt/X11GraphicsEnvironment.registerNativeFonts
> >
> > TRACE 1399:
> > sun/io/CharToByteSingleByte.convert
> > sun/awt/font/NativeFontWrapper.registerFonts
> > sun/awt/X11GraphicsEnvironment.registerNativeFonts
> > sun/java2d/SunGraphicsEnvironment$2.run
> >
> > TRACE 182:
> > java/lang/String.charAt
> > sun/io/CharToByteSingleByte.getNative
> > sun/io/CharToByteSingleByte.convert
> > sun/awt/font/NativeFontWrapper.registerFonts
> >
> > Here are the startup times for AWT:
> >
> > Original: w/modifications:
> > ---------------- ------------------------------
> > run 1: 2607 ms 608 ms
> > run 2: 2579 ms 573 ms
> > run 3: 2583 ms 601 ms
> > run 4: 2713 ms 599 ms
> >
> > Note: The only modifications performed are adding the URW fonts to my
> > XF86Config and using the font.properties from Kees-Jan's site instead of the
> > original one!
> >
> > Here is the top 10 of CPU time eaters for my application with the
> > modifications applied:
> >
> > CPU TIME (ms) BEGIN (total = 9169) Fri Dec 1 17:46:56 2000
> > rank self accum count trace method
> > 1 2.91% 2.91% 318 110 java/util/Properties.loadConvert
> > 2 2.75% 5.66% 252 109 java/util/Properties.loadConvert
> > 3 2.25% 7.91% 5 158 java/util/Properties.load
> > 4 1.98% 9.89% 6356 987 java/lang/String.indexOf
> > 5 1.73% 11.63% 5479 584 java/io/BufferedInputStream.read
> > 6 1.73% 13.36% 5479 142 java/io/StreamTokenizer.read
> > 7 1.49% 14.85% 8590 203 java/lang/StringBuffer.append
> > 8 1.42% 16.27% 8590 675 java/lang/String.charAt
> > 9 1.41% 17.68% 8133 946 java/lang/StringBuffer.append
> > 10 1.36% 19.04% 8133 207 java/lang/String.charAt
> >
> > Now all of a sudden my application code comes on top. And that's the way I
> > like it! :)
> >
> > IMHO these results are quite amazing!
> >
> > Next thing I'll do is write a small program that will do nothing but starting
> > AWT and displaying the startup times, as the current results are obtained by
> > looking at the log output of my own Swing application.
> >
> >
> > Ernst
> >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-java" in the body of the message
> >
> public class AWTTest {
>
> public static void main(String[] args) throws Exception {
>
> // Load the Toolkit class from the AWT package
> long beforeClassLoad = System.currentTimeMillis();
> Class c = Class.forName("java.awt.Toolkit");
> long afterClassLoad = System.currentTimeMillis();
>
> // Get the getDefaultToolkit() class function
> java.lang.reflect.Method m = c.getMethod("getDefaultToolkit", null);
>
> // Invoke the class function
> long beforeInvoke = System.currentTimeMillis();
> m.invoke(null, null);
> long afterInvoke = System.currentTimeMillis();
>
> long t1 = afterClassLoad - beforeClassLoad;
> long t2 = afterInvoke - beforeInvoke;
>
> System.out.println("Class load took: " + t1 + " ms.");
> System.out.println("AWT startup took: " + t2 + " ms.");
> System.exit(0);
> }
> }
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