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

[Гаврилов Максим <ulltor gmail com>]

Why do you call it an equivalent version if there's no sign of Glib, garbage
collection, etc. in this code?

Just write a Glib-based wc in C, and it will be as fast as in Vala.
06.06.2011 17:07 пользователь "Serge Hulne" <serge hulne gmail com> написал:
> 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;
> > }
> > }
> >
> >
> >
> >
> > _______________________________________________
> > vala-list mailing list
> > vala-list gnome org
> > http://mail.gnome.org/mailman/listinfo/vala-list