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

Razii <>
Thu, 20 Mar 2008 06:23:43 -0500
On Thu, 20 Mar 2008 10:36:20 +0000 (UTC), Lionel B <>

That's probably why he suggested using `multiset'.

By the way, have look at 2001 post where I used set...

In that case, it didn't make a difference because bible.txt I was
using had verse numbers (so there could be no duplicates). A few here
(including Pete Becker from dinkumware) claimed that I used set and it
was unfair...

In any case, I can use multiset...

Time for reading, sorting, writing: 328 ms (c++)
Time for reading, sorting, writing: 312 ms (c++)
Time for reading, sorting, writing: 312 ms (c++)

Just a little improvement only...

For Java I can try TreeSet

(which I asume does something similiar -- if not, any Java expert can
correct it).

Time for reading, sorting, writing: 359 ms
Time for reading, sorting, writing: 360 ms
Time for reading, sorting, writing: 359 ms

Not much changes here ...

------ c++-------
#include <fstream>
#include <string>
#include <set>
#include <algorithm>
#include <ctime>
using namespace ::std;
using namespace std;

void main()
   multiset<string> buf;
   string linBuf;
   ifstream inFile("bible.txt");

   clock_t start=clock();
   ofstream outFile("output.txt");
clock_t endt=clock();
   cout <<"Time for reading, sorting, writing: " << endt-start << "


-------- java -----------

import java.util.*;
public class IOSort
    public static void main(String[] arg) throws Exception
            Collection<String> ar = new TreeSet<String> ();
            String line = "";
            BufferedReader in = new BufferedReader( new
            PrintWriter out = new PrintWriter(new BufferedWriter(new
            long start = System.currentTimeMillis();
            while (true)
            { line = in.readLine();
              if (line == null)
            int size = ar.size();
            for (String c : ar)
            long end = System.currentTimeMillis();
           System.out.println("Time for reading, sorting, writing: "+
(end - start) + " ms");


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