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Full Discussion: script to add numbers is slow
Top Forums Shell Programming and Scripting script to add numbers is slow Post 302300316 by CRGreathouse on Monday 23rd of March 2009 09:10:19 PM
Old 03-23-2009
Lightbulb
That is an improvement. I timed it at 2m13.027s doing 5000x5000. But there's a tenfold improvement with a direct translation to C (11.885s):
Code:
#include <stdio.h>

main(int argc, char *argv[])
{
    int height = atoi(argv[1]);
    int width = atoi(argv[2]);
    int i = width * height - width - 1;
    int k = width - 1;
    int j;
    for (j = 0; j < i; j++) {
        if (j == k) {
            //printf("%i\n", k + width);
        } else {
            int tmp = j + width;
            printf("4 %i %i %i %i\n", j, j + 1, tmp + 1, tmp);
        }
    }
    return 0;
}

An optimized version might be even better.
 

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LEARN ABOUT OSX

glviewport

GLVIEWPORT(3G)							    OpenGL 3.3							    GLVIEWPORT(3G)

NAME

       glViewport - set the viewport

C SPECIFICATION

       void glViewport(GLint x, GLint y, GLsizei width, GLsizei height);

PARAMETERS

       x, y
	   Specify the lower left corner of the viewport rectangle, in pixels. The initial value is (0,0).

       width, height
	   Specify the width and height of the viewport. When a GL context is first attached to a window, width and height are set to the
	   dimensions of that window.

DESCRIPTION

       glViewport specifies the affine transformation of x and y from normalized device coordinates to window coordinates. Let x nd y nd be
       normalized device coordinates. Then the window coordinates x w y w are computed as follows:

       x w = x nd + 1  width 2 + x

       y w = y nd + 1  height 2 + y

       Viewport width and height are silently clamped to a range that depends on the implementation. To query this range, call glGet() with
       argument GL_MAX_VIEWPORT_DIMS.

ERRORS

       GL_INVALID_VALUE is generated if either width or height is negative.

ASSOCIATED GETS

       glGet() with argument GL_VIEWPORT

       glGet() with argument GL_MAX_VIEWPORT_DIMS

SEE ALSO

       glDepthRange()

COPYRIGHT

       Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

OpenGL 3.3							    03/08/2011							    GLVIEWPORT(3G)
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