[Vala] Fwd: Why is Vala 10 times slower than C ?

[Serge Hulne <serge hulne gmail com>]

Nope !

Here is the equivalent version in C:

 #include <stdio.h>

#include <stdlib.h>

#include <string.h>

 int main(int argc, char** argv)

{

    FILE *fp = NULL;

    char buff[100], *fileName = NULL;

    int wcnt = 0;

    int lcnt = 0;

     if (argc <2)

    {

        fprintf(stderr, "Usage: wc <file_name>\n");

        exit(1);

    }

     fileName = argv[1];

     if ( (fp = fopen(fileName, "r")) == NULL)

    {

        perror(fileName);

        exit(1);

    }

     while (!feof(fp))

    {

        buff[0] = '\0';

        fgets(buff, sizeof buff/sizeof(char), fp);

        lcnt++;

         char * str = malloc(sizeof(char)*101);

        strcpy(str, buff);

        char * pch;

        pch = strtok (buff," ");

        while (pch != NULL)

        {

          //printf ("%s\n",pch);

          pch = strtok (NULL, " ");

          wcnt++;

        }

     }

     fclose(fp);

     printf("word count: %i words, lines = %d\n", wcnt, lcnt);

    return 0;

}



Serge.



---------- Forwarded message ----------
From: Qball Cow <qball aggervaccae nl>
Date: Mon, Jun 6, 2011 at 2:15 PM
Subject: Re: [Vala] Why is Vala 10 times slower than C ?
To: Serge Hulne <serge hulne gmail com>
Cc: vala-list gnome org


This is not really a fair comparison. Try writing the same code as you wrote
in vala in C and then compare.

You are now comparing a probably very highly optimized 'wc' with a naïve
implementation in vala.



On Mon Jun  6 14:12:37 2011, Serge Hulne wrote:

> I used "wordcount" as a test to compare the processing speed of Vala
> against
> C:
>
>
> I obtained the following result:
>
> ---
> C:
> ---
> serge:vala serge2$ time wc ../shakespeare.txt
>   495200 2703240 15862370 ../shakespeare.txt
>
> real    0m0.194s
> user    0m0.176s
> sys    0m0.015s
>
> ---
> Vala:
> ---
> serge:vala serge2$ time ./hello
> lc = 495201. wc = 3170980
>
> real    0m2.258s
> user    0m2.223s
> sys    0m0.028s
>
>
> -------
>
> The vala code is as follows:
>
> class HelloWorld : GLib.Object {
>      public static int main(string[] args) {
>
>             var f = FileStream.open("../shakespeare.txt", "r");
>             var line = "";
>             var wc = 0;
>             var lc = 0;
>
>             while (!f.eof()) {
>                 line = f.read_line(); lc++;
>                 if (line == null) break;
>                 //stdout.printf("line = %s\n", line);
>                 var words = line.split(" ");
>                 for (int i=0; i<words.length; i++) {
>                     //stdout.printf("word = %s\n", words[i]);
>                     wc++;
>                 }
>             }
>
>             stdout.printf("lc = %d. wc = %d\n", lc, wc);
>             return 0;
>       }
> }
>
>
>
>
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