Memory allocation problem?

Hi~ I’m James Kim.

 

Several days ago, I asked a question, but it wasn’t clear to understand.

I’ll describe what the problem is.

 

System :

CPU - Pentium 4

OS – Host OS is Windows XP, and I use VMWare. Ubuntu 5.1 is guest OS.

Mem – 256M as Ubuntu main memory

 

BenchMark.java source file is like follow :

 

public class Benchmark{

             public static void main(String args[]){

                           long start = System.currentTimeMillis();

 

                           long t1, t2;

                           if( args.length != 2 ){

                                        System.out.println("usage : prog_name  <mat_size> <iter number>");

                                        return;

                           }

                           else{

                                        System.out.println("args" + args.length);

                           }

                          

                           int mat_size = Integer.parseInt(args[0]);

                           int iter_num  = Integer.parseInt(args[1]);

                           int mat[][];

 

                           System.out.println("test start");

                           System.out.println("iteration : " + iter_num);

                           System.out.println("matrix size : " + mat_size);

                           System.out.println("=====================");

 

                           for( int k = 0 ; k < iter_num ; k++ ){

                                        t1 = System.currentTimeMillis();

                                        mat = new int[mat_size][mat_size];

                                        System.out.println("mat[][] is allocated!");

 

                                        for( int i = 0 ; i < mat_size ; i++ ){

                                                     for( int j = 0 ; j < mat_size ; j++ ){

                                                                  mat[i][j] = i*mat_size + j;

                                                                  System.out.print(mat[i][j] + "\t");

                                                     }

                                        }

                                        mat = null;

                                        //          System.gc();

                                        t2 = System.currentTimeMillis() - t1;

                                        System.out.println("Iteration : " + k + " Time : " + t2);

                           }

                           System.out.println("=====================");

                           System.out.println("test finished");

 

                           long end = System.currentTimeMillis() - start;

 

                           System.out.println("Elapsed time : " + end);

 

             }

}

 

 

The result of “sablevm --property=sablevm.heap.size.max=1000000000 Benchmark 10000 1” is like follow :

 

SableVM version 1.11.3

Copyright (C) 2000-2004 Etienne M. Gagnon <etienne.gagnon@...> and

others.  All rights reserved.

 

This software comes with ABSOLUTELY NO WARRANTY.  This is free

software, and you are welcome to redistribute it under certain

conditions.

 

To get the name of all copyright holders and detailed license

information, type "sablevm --license" or look in the directory

"/usr/share/sablevm".

 

The SableVM web site is located at http://www.sablevm.org/ .

 

args2

test start

iteration : 1

matrix size : 10000

=====================

 

The problem is 10000*10000 matrix is not allocted, and sablevm does not produce any error messages for 3 hours and stopped.

 

If I do test this code at different environment, it may work well.

However I want to know why this problem is happening.

Other VMs like default java and kaffe work well in same environment.

 

Is it clear what the problem is?

I’m afraid of omitting something important facts….

Thanks~

 

James.