Use C programming: You will create processes, run processes in parallel, and pas

ID: 3925567 • Letter: U

Question

Use C programming:

You will create processes, run processes in parallel, and pass information between processes. The data to be processed are lines of CSV separated values, we wish to sort these. Get one of these data sets: http://earthquake.usgs.gov/earthquakes/feed/vl.0/csv.php {all quakes last 30 days) or http://www-odi.nhtsa.dot.gov/downloads/flatfiles.cfm and get the FLAT_RCL file (zip) which are all vehicle recalls in the US (the RCL.txt is the "meta"-data (schema) description of the data) If you sort the earthquake data, sort by magnitude, in descending order, if you sort the recalls sort by year of recall and manufacturer (first year, then manufacture name). Either: sort by hand, or write a two loop (bubble or insertion) sort program to sort the data. "Instrument" your program (time it). Create a program that will, in turn, run multiple processes "concurrently" using "for k()" and "exec()" (there are several variants of exec (execl, execv, etc.) Please do not use "threads" (yet). Do the sort, again, in parallel for 2 concurrent processes, then 4, and 10 processes. Instrument those sorts (above). (?) How will you pass data (parts of the array) to each process (IPC)? (Files, pipes, shared memory, message queues?) You may (not required) to use a menu to select number of processes, size of data, etc. You will create a process and threads, run in parallel, and pass information between threads. You will use synchronization operations to avoid overwriting shared resources. As in Assignment above: Use the same data set, as assignment 2. Either: sort by hand, or write a two loop (bubble or insertion) sort program to sort the numbers in ascending order. "Instrument" your program (time it). Create a program that will, in turn, run multiple threads "concurrently" using a kernel level threading system, (there are several options: Pthreads, Java, c/c++) Do the sort, again, in parallel for 2 concurrent threads, then 4, and 10 threads. Instrument those sorts (above). (?) How will you pass data (parts of the array) to each thread? (How will you synchronize sharing resources such as memory?) You may (not required) to use a menu to select number of threads, size of data, etc.

Explanation / Answer

import java.net.HttpURLConnection;
import java.net.URL;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
* @author Crunchify.com
*
*/

public class CrunchifyGetPingStatusWithExecutorService {
   private static final int MYTHREADS = 30;

   public static void main(String args[]) throws Exception {
       ExecutorService executor = Executors.newFixedThreadPool(MYTHREADS);
       String[] hostList = { "http://crunchify.com", "http://yahoo.com",
               "http://www.ebay.com", "http://google.com",
               "http://www.example.co", "https://paypal.com",
               "http://bing.com/", "http://techcrunch.com/",
               "http://mashable.com/", "http://thenextweb.com/",
               "http://wordpress.com/", "http://wordpress.org/",
               "http://example.com/", "http://sjsu.edu/",
               "http://ebay.co.uk/", "http://google.co.uk/",
               "http://www.wikipedia.org/",
               "http://en.wikipedia.org/wiki/Main_Page" };

       for (int i = 0; i < hostList.length; i++) {

           String url = hostList[i];
           Runnable worker = new MyRunnable(url);
           executor.execute(worker);
       }
       executor.shutdown();
       // Wait until all threads are finish
       while (!executor.isTerminated()) {

       }
       System.out.println(" Finished all threads");
   }

   public static class MyRunnable implements Runnable {
       private final String url;

       MyRunnable(String url) {
           this.url = url;
       }

       @Override
       public void run() {

           String result = "";
           int code = 200;
           try {
               URL siteURL = new URL(url);
               HttpURLConnection connection = (HttpURLConnection) siteURL
                       .openConnection();
               connection.setRequestMethod("GET");
               connection.connect();

               code = connection.getResponseCode();
               if (code == 200) {
                   result = "Green ";
               }
           } catch (Exception e) {
               result = "->Red<- ";
           }
           System.out.println(url + " Status:" + result);
       }
   }
}

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