opengl - Pyglet: Unstable fps when using Vsync... and no other software -

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i using pyopengl , pyglet simple application. using vsync swap buffers @ 120 hz. here problem. when run many applications outlook, chrome, notepad++, dora's great adventure on background, fps steady enough @ 120hz. but, when turn off applications, fps goes 114hz 125hz !?!?

i thought closing applications in fact improve fps, no. application out of sync. thought fps given pyglet stick between 119 & 121.

can me figure out? not seeing obvious stuff?

here code

def on_draw(dt):     cnt     screenswap     left = true     right = false     rval = 0.0/255.0     gval = 153.0/255.0     bval = 0.0/255.0      shapeposition(speed = 0.25)      glclear(gl_color_buffer_bit)  # clear color buffer     glloadidentity()              # reset model-view matrix     drawchecker(nbr = 16, dark = 25.0/255, light = 75.0/255)      if screenswap == 1:         drawquestionmark(rval, gval, bval, left)         # blue line         blueline(left)                 # line see if dropping frame         dropframetest(left)         screenswap = 0      else:              drawquestionmark(rval, gval, bval, right)             # blue line         blueline(right)         # line see if dropping frame         dropframetest(right)         screenswap = 1       fps = pyglet.clock.get_fps()     fd.write( str(fps) + "\n")   # debug

and more:

display = pyglet.window.get_platform().get_default_display() screens = display.get_screens()  # direct opengl commands window. config = config(double_buffer = true) window = pyglet.window.window(config = config, screen=screens[1],  vsync=true) # set full screen in separate function avoid flicker start window.set_fullscreen(true) pyglet.clock.clockdisplay() #pyglet.clock.set_fps_limit(120) fps = pyglet.clock.get_fps() dt = pyglet.clock.tick()     pyglet.clock.schedule_interval(on_draw, 0.001) pyglet.app.run() fd.close()

ok, think understand happening.

in order understand behavior, wrote file time , frame rate everytime drew frame. used "gpu task manager" information on gpu load @ specific time (gpu-z).

when have lot of applications running in ground, application runs fine , gpu load around 25%.

when not have lot of applications running in ground, application out of sync, cpu load higher , gpu load around not steady.

i made observations on 2 different implementations of code, , monitored gpu + cpu activity 15 minutes each time.

at first, assumed cpu taking of load... seems wrong.


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