Re: Java vs C++ speed (IO & Sorting)

On Fri, 21 Mar 2008 08:26:09 -0700 (PDT), zion...@gmail.com wrote:


Try these verions (only IO test) with g++ (in this version java is
using nio package for reading and writing).

Let me know what time you get for Java and c++ with g++

=== java ===
import java.io.*;
import java.nio.*;
import java.nio.channels.*;

public class CopyFile
{
    public static void main(String[] arg) throws Exception
   {
  FileChannel in = new FileInputStream("bible.txt").getChannel();
  FileChannel out = new FileOutputStream("output.txt").getChannel();

            long start = System.currentTimeMillis();
             in.transferTo (0, in.size(), out);
           out.close(); in.close();
           long end = System.currentTimeMillis();

       System.out.println("Time for reading and writing files: " +
(end - start) + " ms");

   }

}

===== C++ Version =======
#include <ctime>
#include <fstream>
#include <iostream>
int main(int argc,char *argv[])
{

   std::ifstream src("bible.txt");
   std::ofstream dst("output.txt");
   clock_t start=clock();
   dst << src.rdbuf();
   clock_t endt=clock();

    std::cout <<"Time for reading and writing file: " <<
       double(endt-start)/CLOCKS_PER_SEC * 1000 << " ms\n";
    return 0;

}