Performance issues on N97

[ranco]

I'm having serious performance issues on a game that uses accelerometer (via Services API). Accelerometer data seems to accumulate, generating a delay that get worse in time. Sometimes the game just stuck for a second. The game runs perfectly on several 5800 devices. FPS is 100, or 120, to allow proper accelerometer reading, but still I have this problem. 2 weeks ago it worked fine on N97 too, not nothing that I've changed looks suspicious to me... unfortunately I don't use version control, so I can't roll back.
I have only one N97 device to test on. could it be a problem with that specific device? Anyone encountered such problems?

Thanks,
Ranco

[manikantan]

Hi Ranco,
Using the Platform services and getting delay and performance issues are known issues in FL as of now.
Even in 5800, using the accelerometer for more than 10 mins - you might end up with a hang of the phone.. There was a thread describing with the same issue.
http://discussion.forum.nokia.com/fo...d.php?p=694111

[ranco]

Hi Ranco,
Using the Platform services and getting delay and performance issues are known issues in FL as of now.
Even in 5800, using the accelerometer for more than 10 mins - you might end up with a hang of the phone.. There was a thread describing with the same issue.
http://discussion.forum.nokia.com/fo...d.php?p=694111

Yes, I know all about this, but the game takes only ~60 seconds, and I've really optimized it so that sensor readings are collected as fast as possible, so it should work fine.
What I now suspect is that N97 is FL3.0 and 5800 is FL3.1, which is better optimized for performance. I guess I'll have to start profiling on the N97 to get the bottleneck...
Thanks,
Ranco

[shpe11]

you have to get some 25FPS

but try to make a widget, and use javascript to serve accelerometer data to your flash....

I've made something like this:

function echo(str){
	var t=new Date();
	if(t.valueOf()-T.valueOf()>1000/flashFPS){
		document.getElementById("swfDIV").SetVariable("flashVariable", str);
		T=new Date();
	}
}

where echo is a function that is called from the callback function from API's mechanism from javascript

that function ensure that flash does not get values more than <flashFPS> per second


the problem is like this: the APIs throw values in flash more too fast, and the the flash waits the whole frame to process just one thrown value(even that frame was thrown many values)

Yes, I know all about this, but the game takes only ~60 seconds, and I've really optimized it so that sensor readings are collected as fast as possible, so it should work fine.
What I now suspect is that N97 is FL3.0 and 5800 is FL3.1, which is better optimized for performance. I guess I'll have to start profiling on the N97 to get the bottleneck...
Thanks,
Ranco

[ranco]

After some profiling I found out that even if I set the FPS to 100 or 120, the accelerometer callback is being called ~12 times a sec, which of course causes the lag.
The rest of the application takes 5-6 milisec per frame, so that's not the reason for the sensor callback not to be called.
Again, on 5800 everything works perfectly! Problem occurs on (at least) 2 N97 that I've tested it.

any ideas?

Ranco