TimeIterator.java example

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/*
 * Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
 *
 * Portions of this software were developed by the Unidata Program at the
 * University Corporation for Atmospheric Research.
 *
 * Access and use of this software shall impose the following obligations
 * and understandings on the user. The user is granted the right, without
 * any fee or cost, to use, copy, modify, alter, enhance and distribute
 * this software, and any derivative works thereof, and its supporting
 * documentation for any purpose whatsoever, provided that this entire
 * notice appears in all copies of the software, derivative works and
 * supporting documentation.  Further, UCAR requests that the user credit
 * UCAR/Unidata in any publications that result from the use of this
 * software or in any product that includes this software. The names UCAR
 * and/or Unidata, however, may not be used in any advertising or publicity
 * to endorse or promote any products or commercial entity unless specific
 * written permission is obtained from UCAR/Unidata. The user also
 * understands that UCAR/Unidata is not obligated to provide the user with
 * any support, consulting, training or assistance of any kind with regard
 * to the use, operation and performance of this software nor to provide
 * the user with any updates, revisions, new versions or "bug fixes."
 *
 * THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
 */
package ucar.ma2;

import java.io.IOException;

/*
Test size= 50 Mbytes

1.4.2_09 -client

createArray took = 156 msecs
writeArray took = 1297 msecs
writeArray(setFloat(elem)) took = 531 msecs

readArray took = 1047 msecs
readArray(FastIterator) took = 750 msecs
readArray(getFloat(elem)) took = 469 msecs
readArray(ArrayFloat) took = 437 msecs

create took = 125 msecs
write took = 172 msecs
read took = 438 msecs

1.4.2_09 -server

createArray took = 141 msecs
writeArray took = 625 msecs
writeArray(setFloat(elem)) took = 281 msecs

readArray took = 469 msecs
readArray(FastIterator) took = 500 msecs
readArray(getFloat(elem)) took = 422 msecs
readArray(ArrayFloat) took = 94 msecs

create took = 140 msecs
write took = 125 msecs
read took = 94 msecs

1.5.0 -client

createArray took = 156 msecs
writeArray took = 1344 msecs
writeArray(setFloat(elem)) took = 594 msecs

readArray took = 906 msecs
readArray(FastIterator) took = 750 msecs
readArray(getFloat(elem)) took = 469 msecs
readArray(ArrayFloat) took = 437 msecs

create took = 125 msecs
write took = 188 msecs
read took = 437 msecs

1.5 -server

createArray took = 359 msecs
writeArray took = 422 msecs
writeArray(setFloat(elem)) took = 312 msecs

readArray took = 469 msecs
readArray(FastIterator) took = 516 msecs
readArray(getFloat(elem)) took = 437 msecs
readArray(ArrayFloat) took = 78 msecs

create took = 235 msecs
write took = 109 msecs
read took = 94 msecs

1.6.0 -client

createArray took = 156 msecs
writeArray took = 766 msecs
writeArray(setFloat(elem)) took = 391 msecs

readArray took = 703 msecs
readArray(FastIterator) took = 609 msecs
readArray(getFloat(elem)) took = 453 msecs
readArray(ArrayFloat) took = 157 msecs

create took = 156 msecs
write took = 109 msecs
read took = 172 msecs

1.6 server

createArray took = 359 msecs
writeArray took = 328 msecs
writeArray(setFloat(elem)) took = 109 msecs

readArray took = 313 msecs
readArray(FastIterator) took = 234 msecs
readArray(getFloat(elem)) took = 94 msecs
readArray(ArrayFloat) took = 78 msecs

create took = 219 msecs
write took = 109 msecs
read took = 94 msecs

*/

public class TimeIterator {

  public void write(float[] a) {
    for (int i = 0; i < a.length; i++) {
      a[i] = (float) i;
    }
  }

  public float read(float[] a) {
    float sum = 0;
    for (int i = 0; i < a.length; i++) {
      sum += a[i];
    }
    return sum;
  }

  public void writeArray(Array A) {
    int count = 0;
    IndexIterator iter = A.getIndexIterator();
    while (iter.hasNext())
      iter.setFloatNext( count++);
  }

  public void writeArray2(Array A) {
    int size = (int) A.getSize();
    for (int i = 0; i < size; i++) {
      A.setFloat(i, (float) i);
    }
  }

  public float readArray(Array A) {
    float sum = 0;
    IndexIterator iter = A.getIndexIterator();
    while (iter.hasNext()) {
      sum += iter.getFloatNext();
    }
    return sum;
  }

  public float readArray2(Array A) {
    float sum = 0;
    IteratorFast iter = (IteratorFast) A.getIndexIterator();
    while (iter.hasNext()) {
      sum += iter.getFloatNext();
    }
    return sum;
  }

  public float readArray3(Array A) {
    int size = (int) A.getSize();
    float sum = 0;
    for (int i = 0; i < size; i++) {
      sum += A.getFloat(i);
    }
    return sum;
  }

  public float readArray4(Array A) {
    ArrayFloat Afloat = (ArrayFloat) A;
    int size = (int) A.getSize();
    float sum = 0;
    for (int i = 0; i < size; i++) {
      sum += Afloat.getFloat(i);
    }
    return sum;
  }

  public void test(int z) {
    int size = 1000 * 1000;
    System.out.println("\nTest size= "+z+" Mbytes");

    long start = System.currentTimeMillis();
    Array A = Array.factory( DataType.FLOAT, new int[]  {z*size} );
    long took = System.currentTimeMillis() - start;
    System.out.println("createArray took = " + took+" msecs");

    start = System.currentTimeMillis();
    writeArray(A);
    took = System.currentTimeMillis() - start;
    System.out.println("writeArray took = " + took+" msecs");

    start = System.currentTimeMillis();
    writeArray2(A);
    took = System.currentTimeMillis() - start;
    System.out.println("writeArray(setFloat(elem)) took = " + took+" msecs");

    start = System.currentTimeMillis();
    readArray(A);
    took = System.currentTimeMillis() - start;
    System.out.println("readArray took = " + took+" msecs");

    start = System.currentTimeMillis();
    readArray2(A);
    took = System.currentTimeMillis() - start;
    System.out.println("readArray(FastIterator) took = " + took+" msecs");

    start = System.currentTimeMillis();
    readArray3(A);
    took = System.currentTimeMillis() - start;
    System.out.println("readArray(getFloat(elem)) took = " + took+" msecs");

    start = System.currentTimeMillis();
    readArray4(A);
    took = System.currentTimeMillis() - start;
    System.out.println("readArray(ArrayFloat) took = " + took+" msecs");

    start = System.currentTimeMillis();
    float[] data = new float[z*size];
    took = System.currentTimeMillis() - start;
    System.out.println("create took = " + took+" msecs");

    start = System.currentTimeMillis();
    write(data);
    took = System.currentTimeMillis() - start;
    System.out.println("write took = " + took+" msecs");

    start = System.currentTimeMillis();
    read(data);
    took = System.currentTimeMillis() - start;
    System.out.println("read took = " + took+" msecs");  // */
  }


  public static void main(String args[]) throws IOException {
    TimeIterator ti = new TimeIterator();
    //ti.test(1);
    //ti.test(5);
    ti.test(50);
    ti.test(50);
    ti.test(50);

    System.in.read();

  }

}