RE: heap space and performance

[Edson Carlos Ericksson Richter]

Heap consumption and performance are real problems in Java.
But some great pratices in coding solve (or amenizes) the problem:

1) Don't repeat declaration of common used variables:

2) Create a thread in your main class taking a "forced garbage collection".

See the following program, that I've reorganized to avoid duplicated declarations, and 
should work forever:


import java.io.*;
import java.net.*;

public class test extends Thread {
        URL yahoo;
        URLConnection yc;
        Runtime rt = Runtime.getRuntime();
        BufferedReader in;
        String inputLine;

        public static void main(String[] args) throws Exception {
                new test( args );
        }

        public test( String [] args ) {
                int arg;
//              long mem;  You dont use this code for nothing

                arg = Integer.parseInt( args[ 0 ] );
                this.start( );

                for( int i = 0; i < arg; i ++ ) {
                        work( i );
                }
        }

    private void work( int i ) {
                try {
                        if( i % 100 == 0 ) {
                                System.out.println( i + ":  " + rt.totalMemory( ) + " 
bytes\n" );
                        }

                        // the declarations was transferred to class scope, avoiding 
waste memory allocation
                        yahoo = new URL( "http://127.0.0.1/" );
                        yc = yahoo.openConnection( );
                        in = new BufferedReader( new InputStreamReader( 
yc.getInputStream( ) ) );

                        while( ( inputLine = in.readLine( ) ) != null ) {
                                System.out.println(inputLine);
                        }

                        in.close( );
                } catch( IOException e ){
                }
        }
        
        public void run( ) {
                while( true ) {
                        try {
                                this.sleep( 5000 ); // Make a forced Garbage Colection 
every 5 seconds
                                rt.gc( );
                        } catch( Exception e ) {
                        }
                }
        }
}


Edson Richter



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