Huge Overhead on iOS device

When profiling on our ipod 4gen there seems to be a massive amount of the CPU being taken up by Overhead. On device it is around 80% but on pc it is around 8%. What is Overhead and how can it be reduced? It is causing FPS issues in our game.

Game is being developed with c# using 4.3





Thanks in advance

 

Seeing the same thing on 4.5.2

 

The overhead is the total frame time minus the duration of everything else that's been actively profiled (such as your scripts). This overhead isn't broken down into smaller details at all, but it will consist of things like the processing done internally by the Unity engine. In theory, the more complex your level/game the more overhead you're likely to see.

Now, you could try setting the frame rate to a fixed value, like 30:

http://docs.unity3d.com/ScriptReference/Application-targetFrameRate.html

 

Hi,

I tried adding the above Target frame rate code, but I get same issue on iOS8/iPhone.
"Overhead" is consuming over 60 percent CPU within the Profiler connected to the iPhone.
I have no idea how to start debugging this, currently using 4.6b20
Also disabled VSYNC and the code works as in Editor FPS is capped at 30.

Any further ideas?

This seems to only be happening when I do "iOS profiler over USB"
Made a Xcode Build etc
When running profiler in Editor the issue is not present at all.

I'm using Prime31 plugins for iOS, not sure if these are culprits.

 

From my experience, when you're profiling app with your iPhone connected, the "Overhead" consuming percentage goes higher when the frame rate of the app on your iPhone is low. So if you set Application.targetFrameRate higher(you can choose from 15, 30, 60), the percentage will go lower.

 

Yes, most of the time "Overhead" means waiting for VSYNC on iOS. And you can't turn it off, because OS doesn't provide a way to do it.