Performance Analysis (again :)

[polymorphisme <we...@polymorphisme.org>]

Hello,

I'm trying the new intermediate format from the article 
"Performance Analysis for Apache FOP's new Intermediate Format"  of Jeremias
Märki.  
and his program
(http://www.jeremias-maerki.ch/download/fop/FOP%20Benchmarks.zip).
Thanks to Jeremias.

So, I have write a small file.xml and a file xml2fo.xsl for the
transformation xml --> fo.

When I do a test with the FOPBenchmark,
I obtain a duration of 0,39 seconds! in the results.xml (with the variant
"from-it") :

  <scenario name="xml2fo" variant="from-if">
    <description>Apache FOP: file.xml example, rendering from Intermediate
      Format</description>
    <environment>  
      <value name="java.specification.version">1.6</value>      
    </environment>
    <run idx="0">
      <run>
        <value name="target-format">PDF</value>
        <page-count>2</page-count>
        <duration>390</duration>
        <file mime="application/pdf;mode=painter"
size="24294">file:/C:/Users/greg/workspace/FOPBenchmarks/benchmarks/dev/05/file.if.pdf.if.if.pdf
        </file>
      </run>
    </run>
  </scenario> 

So, I take the class java bellow (for a program) :

public class Main {

    public static void main(String[] args) {
 
     FopFactory fopFactory = FopFactory.newInstance();

        try {
            long startTime = System.nanoTime();          

            File baseDir = new File(".");
            File outDir = new File("out");
            final File xmlfile = new File(baseDir, "xml/file.xml");
            File xsltfile = new File(baseDir, "xsl/xml2fo.xsl");
            File iffile = new File(outDir, "file.if.xml");
            File stampxsltfile = new File(baseDir, "xsl/ifstamp.xsl");
            File pdffile = new File(outDir, "file.if.pdf");                                
         
            Main app = new Main();

            // Setup output
            OutputStream out = new java.io.FileOutputStream(pdffile);
            out = new java.io.BufferedOutputStream(out);
           
            try {
                FOUserAgent userAgent = fopFactory.newFOUserAgent();

                String mime = MimeConstants.MIME_PDF;
                IFDocumentHandler targetHandler =
fopFactory.getRendererFactory().createDocumentHandler(
                        userAgent, mime);

                IFUtil.setupFonts(targetHandler);
                targetHandler.setResult(new StreamResult(pdffile));

                IFParser parser = new IFParser();

                Source src = new StreamSource(iffile);
                Source xslt = new StreamSource(stampxsltfile);
 
                TransformerFactory tFactory =
TransformerFactory.newInstance();
                Transformer transformer = tFactory.newTransformer(xslt);          

                SAXResult res = new
SAXResult(parser.getContentHandler(targetHandler, userAgent));

                transformer.transform(src, res);
            } finally {
                out.close();
            }            
                                   
            long estimatedTime = System.nanoTime() - startTime;              
            System.out.println("estimatedTime : " + estimatedTime + "\n");
         
        } catch (Exception e) {
            e.printStackTrace(System.err);
            System.exit(-1);
        }
    }
} 

I can obtain a file.if.pdf (2 pages), but the transformation take 2.4
seconds !
 I think it's very a long duration when I see <duration>390</duration> in my
results.xml !

Do you know why when I use a class java the duration is very long ?
What can I do for obtain a more small duration ?

Thank.
-- 
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Re: Performance Analysis (again :)

[Chris Bowditch <bo...@hotmail.com>]

On 23/08/2011 10:19, polymorphisme wrote:
> Hello,

Hi,

<snip/>

> I can obtain a file.if.pdf (2 pages), but the transformation take 2.4
> seconds !
>   I think it's very a long duration when I see<duration>390</duration>  in my
> results.xml !
>
> Do you know why when I use a class java the duration is very long ?
> What can I do for obtain a more small duration ?

Don't forget that the JVM needs to be warmed up before you can get 
accurate measurements. This is because of Just in Time (JIT) compile, so 
the first time the clases have to be loaded they are compiled to byte 
code and then in the next few runs, the compiler will optimize any hot 
spots. So, you probably need to run a loop of tests and discount the 
results from the first 10 or so.

Chris

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