Re: Memory use

• To: OLVER OLFREY HERNANDEZ NAVARRO <oohernan@xxxxxxxxxxxxxxxxxxxx>
• Subject: Re: Memory use
• From: Tom Whittaker <tomw@xxxxxxxxxxxxx>
• Date: Mon, 07 Oct 2002 11:31:03 -0500

Hope that helps...

tom

Here's the test program:

import java.*;
import visad.*;
import java.lang.*;

public class olver {
public static void main(String[] a) {
  try {
  RealType rt1 = new RealType("xc");
  RealType rt2 = new RealType("yc");
  RealType rt3 = new RealType("rc");
  RealTupleType dt = new RealTupleType(rt1,rt2);
  FunctionType ft = new FunctionType(dt, rt3);
  Integer2DSet ds = new Integer2DSet(1000,1000);
  Integer1DSet[] rs = { new Integer1DSet(rt3, 255)};
  //FlatField ff = new FlatField(ft, ds, null, null, rs, null);
  FlatField ff = new FlatField(ft, ds, null, null, null, null);
  float[][] data = new float[1][1000 * 1000];
  int z=0;
  for (int i=0; i<1000; i++) {
    for (int j=0; j<1000; j++) {
      data[0][z] = i+j;
      z++;
    }
  }
  ff.setSamples(data);
  data = null;
  System.gc();
  double totalMemory = (double) Runtime.getRuntime ().totalMemory ();
  double freeMemory = (double) Runtime.getRuntime ().freeMemory ();
  double usedMemory = (totalMemory-freeMemory);
  int percent = (int)(100.0*(usedMemory/totalMemory));
  totalMemory = totalMemory/1000000.0;
  usedMemory = usedMemory/1000000.0;

  } catch (Exception e) {e.printStackTrace(); }
}
}


OLVER OLFREY HERNANDEZ NAVARRO wrote:

Hi all.


I'm working with Satellite Images, and I'm using visad to visualizate
them.  I need that visad use less memory, then I try to construct the
FlatField in this way:

new FlatField( func_domain_range, domain_set,null,null,new Integer1DSet[]
{new Integer1DSet(varRaster,255)},null);

but it spend more memory that in this way:

new FlatField( func_domain_range, domain_set,null,null,null,null);

Why the first one use more memory?

Thank's

--
Olver Hernández
Facultad de Minas
Universidad Nacional de Colombia
Sede Medellín

--
Tom Whittaker (tomw@xxxxxxxxxxxxx)
University of Wisconsin-Madison
Space Science and Engineering Center
Cooperative Institute for Meteorological Satellite Studies
Phone/VoiceMail: 608.262.2759

• References:
  • Memory use
    • From: OLVER OLFREY HERNANDEZ NAVARRO