Ok, i have new informations.
I made a simple example here:
#include <agar/core.h>
#include <agar/gui.h>
int main(int argc, char *argv[])
{
AG_Window *win;
AG_Fixed *fix;
AG_Button *btn;
AG_InitCore( "player_demo", 0 );
agVerbose = 1;
AG_InitVideo( 640,480,0, AG_VIDEO_OPENGL );
win = AG_WindowNew( 0 );
AG_WindowMaximize( win );
AG_WindowShow( win );
AG_SetRefreshRate(50);
AG_BindGlobalKey(SDLK_ESCAPE, KMOD_NONE, AG_Quit);
AG_EventLoop_FixedFPS();
}
When NOT using the "AG_SetRefreshRate()" function on this example, the cpu
load was 'ok', between 9%-15%
here's a top "screenshot".
PID COMMAND %CPU TIME #TH #PRTS #MREGS RPRVT RSHRD RSIZE VSIZE
1176 player_dem 14.1% 0:04.03 2 95 211 4096K 23M 14M 393M
When i set the "AG_SetRefreshRate(50)" to 50 fps the cpu usage was between
80%-101%
PID COMMAND %CPU TIME #TH #PRTS #MREGS RPRVT RSHRD RSIZE VSIZE
1202 player_dem 99.7% 1:00.17 2 95 206 4616K 22M 14M 393M
264 firefox-bi 8.3% 4:11.66 15 145 812 59M 22M 121M 491M
If agar is running 60fps by default, why, when using 50fps, i got so high
cpu usage for a simple window?
Here is my GL info:
Video display is 32bpp (00ff0000,0000ff00,000000ff)
Reference surface is 32bpp (000000ff,0000ff00,00ff0000,ff000000)
GL Version: 1.2 APPLE-1.5.48
GL Vendor: Intel Inc.
GL Renderer: Intel GMA X3100 OpenGL Engine
btw, i'm using Mac, but it happens on linux too.
I'm hoping that i am doing something wrong and waiting for clarifications.
Thanks Julien.
On Wed, Sep 23, 2009 at 4:21 AM, Julien Nadeau <[email protected]>wrote:
> On Wed, Sep 23, 2009 at 03:50:54AM -0300, Paulo Pinheiro wrote:
> > Hello,
> >
> > I`m using agar for a video player application and i notice a high cpu
> usage...
> > When using agar i saw the app eating up 90-100% of CPU( tested with top
> ),
> > while using pure SDL it was only about 30%. I tried to profile the
> program
> > and 30% of time was in Draw routine while the rest was in SDL_PumpEvents,
> > notice that all the player complexity is in draw routine. Is it normal
> > behavior or am i doing something wrong?
>
> The stock event loop will use all CPU it needs to achieve your target
> refresh rate; the default refresh rate is 60fps. If you use SDL mode,
> you'll probably want a much lower value that so that the event loop gets
> a chance to idle. See: http://libagar.org/man3/AG_SetRefreshRate
>
> Using SDL mode, most of your CPU time is spent filling rectangles and
> drawing pixels in software. This is why SDL mode is not recommended
> except on platforms lacking hardware-accelerated graphics. Using OpenGL
> mode (pass AG_VIDEO_OPENGL or AG_VIDEO_OPENGL_OR_SDL to AG_InitVideo()),
> all rendering is done efficiently in hardware, with almost no CPU usage
> involved.
>
> It is always preferable for applications to support both modes, OpenGL
> for performance and falling back to SDL for portability.
>
--
Paulo Victor de Almeida Pinheiro
------------------------------
Laboratório de Redes de Comunicação e Segurança da Informação - LARCES
Mestrado em Ciência da Computação - UECE
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