performance measurements

Each table row shows performance measurements for this Java program with a particular command-line input value N.

 N  CPU secs Elapsed secs Memory KB Code B ≈ CPU Load
1,0000.350.33240665  3% 41% 62% 13%
4,0002.902.8619,516665  1% 1% 100% 2%
16,00043.4043.3619,500665  1% 99% 1% 0%

Read the ↓ make, command line, and program output logs to see how this program was run.

Read mandelbrot benchmark to see what this program should do.

 notes

java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) Server VM (build 25.25-b02, mixed mode)

 mandelbrot Java program source code

/* The Computer Language Benchmarks Game

   http://benchmarksgame.alioth.debian.org/

   contributed by Stefan Krause

   slightly modified by Chad Whipkey

*/

import java.io.IOException;
import java.io.PrintStream;

class mandelbrot {

   public static void main(String[] args) throws Exception {
       new Mandelbrot(Integer.parseInt(args[0])).compute();
   }

   public static class Mandelbrot {
       private static final int BUFFER_SIZE = 8192;

       public Mandelbrot(int size) {
         this.size = size;
         fac = 2.0 / size;
         out = System.out;
         shift = size % 8 == 0 ? 0 : (8- size % 8);
      }
      final int size;
      final PrintStream out;
      final byte [] buf = new byte[BUFFER_SIZE];
      int bufLen = 0;
      final double fac;
      final int shift;

      public void compute() throws IOException
      {
         out.format("P4\n%d %d\n",size,size);
         for (int y = 0; y<size; y++)
            computeRow(y);
         out.write( buf, 0, bufLen);
         out.close();
      }

      private void computeRow(int y) throws IOException
      {
         int bits = 0;

         final double Ci = (y*fac - 1.0);
          final byte[] bufLocal = buf;
          for (int x = 0; x<size;x++) {
            double Zr = 0.0;
            double Zi = 0.0;
            double Cr = (x*fac - 1.5);
            int i = 50;
            double ZrN = 0;
            double ZiN = 0;
            do {
               Zi = 2.0 * Zr * Zi + Ci;
               Zr = ZrN - ZiN + Cr;
               ZiN = Zi * Zi;
               ZrN = Zr * Zr;
            } while (!(ZiN + ZrN > 4.0) && --i > 0);

            bits = bits << 1;
            if (i == 0) bits++;

            if (x%8 == 7) {
                bufLocal[bufLen++] = (byte) bits;
                if ( bufLen == BUFFER_SIZE) {
                    out.write(bufLocal, 0, BUFFER_SIZE);
                    bufLen = 0;
                }
               bits = 0;
            }
         }
         if (shift!=0) {
            bits = bits << shift;
            bufLocal[bufLen++] = (byte) bits;
            if ( bufLen == BUFFER_SIZE) {
                out.write(bufLocal, 0, BUFFER_SIZE);
                bufLen = 0;
            }
         }
      }
   }
}

 make, command-line, and program output logs

Wed, 19 Nov 2014 04:27:59 GMT

MAKE:
mv mandelbrot.java mandelbrot.java
mv: ‘mandelbrot.java’ and ‘mandelbrot.java’ are the same file
make: [mandelbrot.java_run] Error 1 (ignored)
/usr/local/src/jdk1.8.0_25/bin/javac mandelbrot.java
0.73s to complete and log all make actions

COMMAND LINE:
/usr/local/src/jdk1.8.0_25/bin/java  -server -XX:+TieredCompilation -XX:+AggressiveOpts mandelbrot 16000

(BINARY) PROGRAM OUTPUT NOT SHOWN

Revised BSD license

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