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  impact of Intel Turbo Boost on frame rates  (Read 707 times)
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Offline phu004

JGO Coder


Medals: 4
Projects: 9
Exp: 10 years


NoSuchPersonException


« Posted 2013-06-17 03:32:42 »

Hi guys, yesterday when I was benchmarking my game loop,  I noticed that the cpu time spent on sleeping increases if I have a CPU intensive program running on the back ground.  I guess the urge for processing power from the other program triggered the cpu to increased its clock frequency.  I get similar result from both Intel i5 and i7 based machines.  

My question is how can you accurately measure the time cpu spend on idle in a game loop? Huh  It's kinda important if you want to know  how much more stuff you can throw at the cpu while maintain a constant frame rate.
Offline Riven
« League of Dukes »

« JGO Overlord »


Medals: 835
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #1 - Posted 2013-06-17 14:53:44 »

My question is how can you accurately measure the time cpu spend on idle in a game loop?

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ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
long currentThreadId = Thread.currentThread().getId();

while(...) {
   // poll these values once a second
   ThreadInfo info = threadBean.getThreadInfo(id);
   long cpuTime = threadBean.getCurrentThreadCpuTime();
   long userTime = threadBean.getCurrentThreadUserTime();
   long waitTime = info.getWaitedTime();

   // calc diff with last second
}

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Offline sproingie

JGO Kernel


Medals: 202



« Reply #2 - Posted 2013-06-17 23:17:22 »

I suspect you could also get this information with visualvm, nicely graphed at that.
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Offline phu004

JGO Coder


Medals: 4
Projects: 9
Exp: 10 years


NoSuchPersonException


« Reply #3 - Posted 2013-06-17 23:54:13 »

Thanks very much for the help, however when I used ThreadMXBean to measure total cpu time  spent in the game loop, I got strange results. As you can see from the chart below, the cpu time does not change from frame 4 to 6.  Any suggestions?


Quote
0    0
1    78000500
2    93600600
3    109200700
4    124800800
5    124800800
6    124800800
7    140400900
8    156001000
9    171601100
10    187201200
11    202801300
12    202801300
13    202801300
14    218401400
15    234001500
16    249601600
17    265201700
18    265201700
19    265201700
20    265201700
...

Here is my code:

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while(true) {
   threadBean = ManagementFactory.getThreadMXBean();

   System.out.println(frameIndex + "    " + threadBean.getCurrentThreadUserTime());

   doSomething();
}
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