Wednesday, January 23, 2013

As promised here is the code for 10 MB varied over the number of threads. I had trouble coming up with it and needed some help. The examples for concurrency in the oracle tutorial were for sockets which didn't have much relationship to what I was doing.Many other tutorials used the same examples. Mine was varied over 1 to 10 threads by a step of 1 because it is difficult to vary by 1, 2, 5, and 10 without the other steps in between. The first test in the code is just the first one done previously.

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import org.jboss.perfrunner.Axis;
import org.jboss.perfrunner.PerfRunner;
import org.jboss.perfrunner.Varying;
import org.junit.Test;
import org.junit.runner.RunWith;
public class SampleTest {
    public void numTest (
    @Varying(name = "MB", axis=Axis.X, from = 1, to = 10000000,step = 250000)int numMax)throws Exception{
         String content = "0";    
        FileWriter fstream = new FileWriter("out.txt");   
        BufferedWriter out = new BufferedWriter(fstream);
        for(int num=0; num < numMax; num++){  
     public void perThread
 @Varying(name = "thread", axis = Axis.X, from = 1, to = 10, step = 1) final int threadCount) throws InterruptedException {
      // First define the task that needs to be done.
     // This task writes a million 'a' characters to a file:
     Runnable task = new Runnable() {
     public void run() {
          // create temporary file with extension suffix
         File file1 = null;
     file1 = File.createTempFile("PerThreadTest", ".javatemp");
     BufferedWriter out = new BufferedWriter(new FileWriter(file1));
     int megabyte = 1000000;
     for (int i = 1; i < megabyte; i++) {
        out.close() ;
        } catch (IOException e) {
            // TODO Auto-generated catch block
       // Now define the executor service that will execute the above task
     ExecutorService exec = Executors.newFixedThreadPool(threadCount);
     // Submit the task 10 times (total data written will be 10MB)
     for (int i = 0; i < 10; i++) {
     // Finally, wait for all the submitted tasks to complete (1 hour should be way more than enough!)
     exec.awaitTermination(1, TimeUnit.SECONDS);
     // Free the threads that were created by Executors.newFixedThreadPool(threadCount) above

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