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I know this has been mentioned but has anyone got an explanation on Memory usage.
I have 3 Sprite Sheets, 512x512, 512x512 and 512x1024, and a BitmapAtlasFont which is 512x512 When added up they take 5MB, that is it nothing else and yet the object allocations show 14.5MB.
Is there something about OpenGL and Cocos2D that I am missing because this seems extremely off. At first glance it looks like the Textures are being allocated twice is this an issue?
Chris
Textures are only allocated once.
The TextureMgr is the a cache and only loads once the textures.
Metric
Member
the file size of the texture does not equal the actual texture size when actually in use. You have to take in account for the BitDepth and if it is 32bit, 16bit, 8bit, 4bit, or 2bit. The lower the bit the lower the quality of the image, but the memory footprint will be small as you go from 32bit -> 2bit. It is recommended to convert your images into the 4bit PVRTC file format for best performance and smaller memory footprint according to Apple.
I know that...they are 32 bit textures...unfortunately they don't look good compressed that is why 512x512 texture takes up 1MB.
I just did some messing around with loading and unloading textures and now the object Allocations now say 2MB which makes even less sense since there are at least 5MB of textures being used!!!
What tool are you using to measure the memory ?
Sometimes UIKit objects are also allocated when you load a texture.
Steve Oldmeadow
Administrator
Here is a good article on how to use instruments to determine texture memory usage. @cublah it would be good to know what your actual texture memory usage is.
http://blog.zincroe.com/2009/04/how-to-check-iphone-texture-memory-usage-with-instruments/
I checked out the texture memory usage on the CocosDenshion demo app and it does seem much higher than what I expected, so perhaps there is something fishy going on.
Thanks Steve for that, being from a PC and console development where I never needed a Mac, I was working my way around Instruments.
OK...it seems to allocate 7MB I guess the other 2MB is Frame buffers etc.
The game itself seems to run up to 18MB in full flow (Using Memory Monitor) and 12MB in Textures, although the 66.7MB of virtual Memory seems a little worrying!
If you reuse the same image, does the memory continue to grow ?
eg:
create an sprite from "sprite.png"
create a new sprite from the same image "sprite.png".
The memory should grow only a few bites... if it grows more than 1Mb then something is wrong.
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