fork(1) download
copy 
  1. import java.util.concurrent.ExecutorService;
  2. import java.util.concurrent.Executors;
  3. import java.util.concurrent.TimeUnit;
  4.  
  5.  
  6. public class ParallelImplementation {
  7. 	private int numberOfCells;
  8. 	private double[] h0;
  9. 	private double[] h1;
  10. 	private double[] h2;
  11. 	private double[] h3;
  12. 	private double[] h4;
  13. 	private double[] h5;
  14. 	private double[] h6;
  15. 	private double[] h7;
  16. 	private double[] h8;
  17. 	private double[] h9;
  18.  
  19. 	public ParallelImplementation(int numberOfCells) {
  20. 		this.numberOfCells = numberOfCells;
  21.         this.h0 = new double[numberOfCells];
  22.         this.h1 = new double[numberOfCells];
  23.         this.h2 = new double[numberOfCells];
  24.         this.h3 = new double[numberOfCells];
  25.         this.h4 = new double[numberOfCells];
  26.         this.h5 = new double[numberOfCells];
  27.         this.h6 = new double[numberOfCells];
  28.         this.h7 = new double[numberOfCells];
  29.         this.h8 = new double[numberOfCells];
  30.         this.h9 = new double[numberOfCells];
  31. 	}
  32.  
  33. 	public void update() {
  34. 		final int numberOfThreads = Runtime.getRuntime().availableProcessors();
  35.  
  36.         ExecutorService exec = Executors.newFixedThreadPool(numberOfThreads);
  37.  
  38.         for(int thread = 0; thread < numberOfThreads; thread++) {
  39.             final int threadId = thread;
  40.             exec.submit(new Runnable() {
  41.                 @Override
  42.                 public void run() {
  43.                     for(int i = threadId; i < numberOfCells; i += numberOfThreads) {
  44.                     	h0[i] =  h0[i] + 1;
  45.             			h1[i] =  h1[i] + 1;
  46.             			h2[i] =  h2[i] + 1;
  47.             			h3[i] =  h3[i] + 1;
  48.             			h4[i] =  h4[i] + 1;
  49.             			h5[i] =  h5[i] + 1;
  50.             			h6[i] =  h6[i] + 1;
  51.             			h7[i] =  h7[i] + 1;
  52.             			h8[i] =  h8[i] + 1;
  53.             			h9[i] =  h9[i] + 1;
  54.                     }
  55.                 }
  56.             });
  57.         }
  58.  
  59.         exec.shutdown();
  60.         try {
  61.             exec.awaitTermination(Integer.MAX_VALUE, TimeUnit.SECONDS);
  62.         } catch (InterruptedException e) {
  63.             e.printStackTrace();
  64.         }
  65. 	}
  66.  
  67. 	public static void main(String[] args) {
  68.  
  69. 		ParallelImplementation si = new ParallelImplementation(100000);
  70.  
  71. 		long start = System.currentTimeMillis();
  72.  
  73. 		for (int i = 0; i < 10000; i++) {
  74.             if(i % 1000 == 0) {
  75.                 System.out.println(i);
  76.             }
  77.             si.update();
  78.         }
  79.  
  80. 		long stop = System.currentTimeMillis();
  81.         System.out.println("Time: " + (stop - start));
  82. 	}
  83.  
  84. }
  85.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
copy 
Standard input is empty
compilation info 
prog.cpp:41:17: error: stray '@' in program
                 @Override
                 ^
prog.cpp:1:1: error: 'import' does not name a type
 import java.util.concurrent.ExecutorService;
 ^
prog.cpp:2:1: error: 'import' does not name a type
 import java.util.concurrent.Executors;
 ^
prog.cpp:3:1: error: 'import' does not name a type
 import java.util.concurrent.TimeUnit;
 ^
prog.cpp:6:1: error: expected unqualified-id before 'public'
 public class ParallelImplementation {
 ^
stdout
copy 
Standard output is empty
https://ideone.com/yfwVmr
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!