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[iOS] Device SDK reports more memory usage in Xcode than Simulator SDK



1. Open attached project ""
2. Build for iOS "Device SDK"
3. Deploy the Xcode project to the iOS device
4. Observe Memory usage in "Show the Debug Navigator" tab
5. Memory usage is about 1.35gb
6. Build the project to iOS "Simulator SDK"
7. Open the Xcode project and run it on iPhone XS Max
8. Observe the memory usage
9. Memory usage is about 600MB

Expected result: memory usage is similar between the simulator and device SDK
Actual result: memory usage is different between the simulator and device SDK

Reproduced on:
2017.4.0f1 2017.4.17f1 2018.2.20f1 2018.3.0b5 2018.3.1f1 2019.1.0a12

Devices tested on:
iPhone XS Max iOS 12.0
iPhone 7 Plus iOS 12.0

Tested on iMac MacOS version 10.14 when deployed to a device , it only shows a black screen and barely visible Unity logo, as it stuck on the last frame of the splash screen.
Tested on Metal and OpenGLES3 and OpenGLES2

  1. Response avatar

    Resolution Note:

    Some difference in reported memory between the Simulator and device is expected. They are running on different CPU architecture, the simulator does not support Metal, Xcode might be tracking memory differently etc. It would be interesting to see instrument memory alloc tool traces for both platforms and the same app, though.

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