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Offline JL235

JGO Coder


Medals: 10



« Reply #30 - Posted 2011-09-21 07:35:06 »

GPU will get less heat(less malfunction) if you just draw everything on short period and rest until next frame.
Exactly. This idea that you need to rest between _every_ draw is simply not true, and will end up using more power, and generate more heat.

Graphics cards can trivially draw 200 to 400 images per frame.

Offline sproingie

JGO Kernel


Medals: 202



« Reply #31 - Posted 2011-09-21 19:22:00 »

I do not know why i should look jdk7 as i will be using java 1.5 classes.

Java7 didn't change the implementation, they changed the docs to be more accurate.  The behavior of Thread.yield() is os-dependent.  In fact, from poking around hotspot's code, it looks like there are places where yield is temporarily disabled, i.e. it does nothing at all.  Solaris has a mode where more than 100 yields/sec are ignored, and so on.

The short of it is, yield will probably lower the total CPU usage simply because the OS scheduler may sleep it as a side effect, but you cannot depend on there being a sleep or in fact having yield do anything at all.  It's a hint, nothing more.
Offline Ultroman

JGO Knight


Medals: 25
Projects: 1


Snappin' at snizzes since '83


« Reply #32 - Posted 2011-09-21 19:33:54 »

you have to put on a variable the time you started your iteration, then do logic and draw, take the difference from the start of iteration, then sleep (40- iterationTime) .

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long startOfIteration= System.nanoTime();

//do logic
//do draw

long delay = (System.nanoTime() - startOfIteration)/1000000 - 40;

if (delay>0)
   Thread.sleep(delay);


That's the moneymaker. Many thanks for that, teletubo. This really smooths out the drawing, compared to using a static sleep(long)

- Jonas
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