[jboss-user] [Performance Tuning] - Re: Trying to increase performance, doesn't seem to be CPU o

[PeterJ]

jamicide, are you sure you need 3GB of heap? Graphing the results should help you determine that. No sense using more memory that what you need.

tsmets, I wrote a simple Java app that uses a regular expression to gather the verbose:gc data and convert it to a CSV file. I then read the CSV file into a spreadsheet app (Excel or OpenOffice.org Calc) and use its graphing features to chart the results.

Here is my Java app:

import java.io.*;
  | import java.util.regex.*;
  | public class Analyzer {
  |   public static void main(String[] args) throws Exception {
  |     InputStream fin = new FileInputStream(args[0]);
  |     int iSize = fin.available();
  |     byte mvIn[] = new byte[iSize];
  |     fin.read(mvIn, 0, iSize);
  |     fin.close();
  |     String strText = new String(mvIn);
  |     PrintStream fout = new PrintStream
  |       (new FileOutputStream(args[0] + ".csv"));
  |     fout.println("Before,After,Seconds");
  |     Pattern p = Pattern.compile
  |       ("\\[(?:Full |)GC (\\d*)K->(\\d*)K\\(\\d*K\\), ([\\d.]*) secs\\]");
  |     Matcher m = p.matcher(strText);
  |     while (m.find())
  |       fout.println(m.group(1) + "," + m.group(2) + "," + m.group(3));
  |     fout.close();
  |   }
  | }

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