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  1. PO
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    <p>The most important think you need to know for memory management in this case is wether to use High or low res textures. The simplest way I use is to check this</p> <pre><code>CGFloat scale = [[UIScreen mainScreen] scale]; if ((scale &gt; 1.0) || (self.view.frame.size.width &gt; 320)) { highRes = TRUE; } </code></pre> <p>This works for all devices so far and should be future proof, newer devices will use the high res. You might also calculate right there the aspect ratio (helps later on ipad vs iphone)</p> <pre><code>aspect = self.view.frame.size.width/self.view.frame.size.width </code></pre> <p>Don't load highres first it kills your apps load time, on my 3G most of my startup is spent loading (even the low res) textures, just test for this right at the beginning and don't touch the highres stuff.</p> <p>On older devices the program will die without warning due to big textures, may have something to do with de debugger not being able to trap the video memory consumption and dying itself.</p> <p>For greater optimizations consider tinting you mipmaps to check the lowest texture size that's actually being used (only if your using 3D objects).</p> <p>Forget the video RAM size issue, memory is actually shared, so you're competing for system memory, on older devices you had a MB limit for use, but it's still system memory.</p> <p>About memory management, there are many ways to do it, the simplest should be mark the textures that are loaded, and textures that are needed, when a memory warning comes, dump the textures that are loaded but not needed...</p>
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    1. POResponding to RAM availability in iOS
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    1. USled42
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    1. COThank you for the detailed response. I can't accept this, because it doesn't answer the core question of how to detect RAM instead of using feature detection (Or are you implying that that's impossible or not worth pursuing?), but +1 for pointing out `scale > 1.0` to detect the iPhone 4. I hadn't thought of that.
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      1. USMarcelo Cantos
    2. COThe only way you can try and detect memory without jailbreaking is by trying to fill it all and measuring how much you got. Also since memory is shared with all the other apps wich might be running (sytems ones, like mail, etc) even knowing the amount of physical memory isn't worth much. That's why I said to forget that route, it's not the solid ground you are looking for.
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    3. COYour wording was ambiguous as to whether I shouldn't think of video memory as separate, or give up on measuring RAM. I don't care about other running apps; empirically, devices with 256 MB always crash, while those with 512 MB never do. Also, your proposed test fails with the latest iPod Touch — retina & 256 MB — underscoring my fears about the fragility of model detection. Incidentally, hunting for a solution to the iPod Touch problem led me to a possible answer, which I'll post separately.
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