next try
-----Ursprüngliche Nachricht-----
Von: Torsten Fohrer [mailto:[EMAIL PROTECTED]
Gesendet: Dienstag, 9. September 2003 13:55
An: 'Tomcat Developers List'
Betreff: AW: AW: AW: [5.0] JSP performance ...
patched a snapshot to merge template text nodes.
I implement following using a additional visitor in Generator.java
- char[] arrays for templatetexts
- same templatetexts -> only 1 char array for text, better without merging
good/bad gimmicks:
- removing empty templatetexts, example: only \r\n, "", null and so
- removing \r\n after scripting elements
One effect, i see is a lower memory usage from jasper pages
cu Torsten Fohrer
-----Ursprüngliche Nachricht-----
Von: Remy Maucherat [mailto:[EMAIL PROTECTED]
Gesendet: Dienstag, 9. September 2003 11:31
An: Tomcat Developers List
Betreff: Re: AW: AW: [5.0] JSP performance ...
Torsten Fohrer wrote:
> what's about char[] array/string reusing?
> Create only a char array for each unique templatetext node.
>
> ->
> 10 x char[] jspx_text_1 = "something\n";
> 1 x char[] jspx_text_1 = "something\n";
Won't the VM do that internally ?
Since apparently you have examined that issue in detail already, maybe
you can give more details :)
- What exactly did you implement ?
- What's the code it generates ? Does it also merge the TemplateText nodes ?
- Did it improve performance ? For example, if you try to run the test I
gave, what kind of performance increase do you see ?
Remy
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package org.apache.jsp;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import java.util.*;
public final class h2000_jsp extends org.apache.jasper.runtime.HttpJspBase
implements org.apache.jasper.runtime.JspSourceDependent {
private char[] _jspx_textLine_1 = "<html><head><title>".toCharArray();
private char[] _jspx_textLine_2 = "</title>".toCharArray();
private char[] _jspx_textLine_3 = "</title></head><body>\r\n".toCharArray();
private char[] _jspx_textLine_4 = "<table>\r\n ".toCharArray();
private char[] _jspx_textLine_5 = "<tr bgcolor=\"".toCharArray();
private char[] _jspx_textLine_6 = "\">\r\n ".toCharArray();
private char[] _jspx_textLine_7 = "<td align=\"center\"><font
size=\"+1\">".toCharArray();
private char[] _jspx_textLine_8 = "</font>".toCharArray();
private char[] _jspx_textLine_9 = "</font></td>\r\n ".toCharArray();
private char[] _jspx_textLine_10 = "</tr>\r\n ".toCharArray();
private char[] _jspx_textLine_11 = "</table>\r\n".toCharArray();
private char[] _jspx_textLine_12 = " Hello World Hello World Hello World Hello World
Hello World Hello World Hello World Hello World Hello World Hello World
".toCharArray();
private char[] _jspx_textLine_13 = " Hello World Hello World Hello World Hello World
Hello World Hello World Hello World Hello World Hello World Hello World <br/>\r\n
".toCharArray();
private char[] _jspx_textLine_14 = "</body></html>\r\n".toCharArray();
private static java.util.List _jspx_dependants;
public java.util.List getDependants() {
return _jspx_dependants;
}
public void _jspService(HttpServletRequest request, HttpServletResponse response)
throws java.io.IOException, ServletException {
JspFactory _jspxFactory = null;
PageContext pageContext = null;
ServletContext application = null;
ServletConfig config = null;
JspWriter out = null;
Object page = this;
JspWriter _jspx_out = null;
try {
_jspxFactory = JspFactory.getDefaultFactory();
response.setContentType("text/html");
pageContext = _jspxFactory.getPageContext(this, request, response,
null, false, 8192, true);
application = pageContext.getServletContext();
config = pageContext.getServletConfig();
out = pageContext.getOut();
_jspx_out = out;
out.write( _jspx_textLine_1 );
out.write(String.valueOf( request.getParameter("title") ));
out.write( _jspx_textLine_3 );
// build tight loop table with array data, multidimensional 5x6
String array[] = { "Hello", "World", "2000", "Hello", "World", "2000" };
Arrays.sort(array);
String multi[][] = { array, array, array, array, array };
out.write( _jspx_textLine_4 );
for(int row=0; row < multi.length; row++) {
out.write( _jspx_textLine_5 );
out.write(String.valueOf( (row % 2) == 1 ? "gray" : "white" ));
out.write( _jspx_textLine_6 );
for(int col=0; col < array.length; col++) {
out.write( _jspx_textLine_7 );
out.write(String.valueOf( multi[row][col] ));
out.write( _jspx_textLine_9 );
}
out.write( _jspx_textLine_10 );
}
out.write( _jspx_textLine_11 );
String dummy = request.getParameter("integer");
int param = 2000; //Integer.parseInt(dummy);
for (int i=1; i<=10; i++) {
int var = i+param;
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
out.write(String.valueOf(var));
out.write( _jspx_textLine_13 );
}
out.write( _jspx_textLine_14 );
} catch (Throwable t) {
if (!(t instanceof SkipPageException)){
out = _jspx_out;
if (out != null && out.getBufferSize() != 0)
out.clearBuffer();
if (pageContext != null) pageContext.handlePageException(t);
}
} finally {
if (_jspxFactory != null) _jspxFactory.releasePageContext(pageContext);
}
}
}
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