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  CPU usage monitoring  (Read 1706 times)
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Offline dranonymous

Junior Member




Hoping to become a Java Titan someday!


« Posted 2004-06-19 01:06:00 »

I've done no research, so I'm open to be flamed. Smiley

Is there any way to detect what the cpu is doing while your program is running?  My thought is that I could run a 'stress test' on the computer the program is running on.  Depending on the results, it would set program options differently at runtime.  I could turn off music or load lower quality images, etc.

Any info?
Inquisitor
Guest
« Reply #1 - Posted 2004-06-19 02:32:45 »

Google for profilers. Java actually has one itself (hotspot profiler) - try running your app with -xprof parameter. If you're using eclipse there's a really nice profiler plugin for it.
Offline dranonymous

Junior Member




Hoping to become a Java Titan someday!


« Reply #2 - Posted 2004-06-19 03:03:22 »

Thanks for the info on the -Xprof.  I have started using that just recently.

I'm actually trying to get at the info in the application itself.  In pseudo code, it might look like this -

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if(CPU.getActivity() >= 0.60f) {
    graphics.antiAliasing(false);
    music.stop();
}

if(CPU.getActivity() <= 0.20f) {
    graphics.antiAliasing(true);
    music.start();
     botAI.setDifficulty(AI_HIGH);
}


In the 'code' CPU.getActivity would return the processors current loading (think task manager in Windows, or ps or top for linux) as a float 0 being not loaded 1 being fully loaded.

I've used a similar technique before.  When network traffic got very high, it would start sucking the CPU.  In the graphics thread, I checked the loading and if it was too high, I skipped the draw for that frame.  This was in a C# program. (Don't flog me for not using java!)

Am I asking for the impossible?

Regards,
Aaron R>
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline princec

JGO Kernel


Medals: 282
Projects: 3
Exp: 16 years


Eh? Who? What? ... Me?


« Reply #3 - Posted 2004-06-19 08:15:09 »

You need to write a bit of JNI to do this.

Cas Smiley

Offline Abuse

JGO Coder


Medals: 10


falling into the abyss of reality


« Reply #4 - Posted 2004-06-26 13:15:57 »

Quote

Is there any way to detect what the cpu is doing while your program is running?


Thats easy, its running your program =)

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Offline elias

Senior Member





« Reply #5 - Posted 2004-06-26 15:30:25 »

I don't know why you want to measure CPU load instead of something more relevant to your game, like FPS. FPS can easily be measured in-game, so why not do something like:

if (fps < 60) {
 disableExpensiveStuff();
}

- elias

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