[Freeciv-Dev] Re: Render speed test with imlib/xrender/sdl/pixbuf/ftwl

[Raimar Falke <i-freeciv-lists@xxxxxxxxxxxxx>]

On Mon, Mar 21, 2005 at 09:52:57PM +0100, Raimar Falke wrote:
> Also with measuring the cycle counter of the CPU with rdtsc I get the
> number of 15-25 cycles per blitted pixel.

I did some scrolling tests with the FTWL client and logged the pixel
(width*height) and the cycles needed. Of each pixel count (like 900
for 30x30) I took the minimal cycles count and plotted it. The result
is attached. x are the pixels and y the cycles. As you see it goes
linear with about a factor of 15. The real average is a bit more
(about 18 cycles per pixels) because of multitasking and cache misses.

        Raimar

-- 
 email: i-freeciv-lists@xxxxxxxxxxxxx
 "The very concept of PNP is a lovely dream that simply does not translate to
  reality. The confusion of manually doing stuff is nothing compared to the
  confusion of computers trying to do stuff and getting it wrong, which they
  gleefully do with great enthusiasm." 
    -- Jinx Tigr in the SDM

pixels_and_cycles.png
Description: PNG image