[Interest] Question to members of the Qt team: why does an empty project consumes so much memory on iOS?

[Nuno Santos]

Thiago,

Sorry for not having replied to you. I missed your email.

"Is that 16 MB of heap? Or are you including sharable & discardable code pages?”

Sorry but I really don’t know what to answer here.

 I’m just launching a new and empty Qt Quick project on Xcode and looking to the memory usage. 

Regards,

Nuno

> On 21 Apr 2015, at 18:13, Thiago Macieira <thiago.macieira at intel.com> wrote:
> 
> On Tuesday 21 April 2015 09:38:19 Nuno Santos wrote:
>> I have been comparing the memory usage by an empty iOS and an empty Qt
>> project on iOS running on an iPad Air. It seems that this is not
>> comparable. Please take a look to the following image. The iOS native
>> project uses 16Mb of memory, while the Qt project needs almost 90Mb. It
>> happens that if the memory limit with an empty project is almost next to
>> the limit, how can a normal app run smoothly? I have made this test, after
>> realising that my app was using 160Mb on the iPad Air simulator. This is
>> huge!
> 
> Because, like I said last time you asked this (yesterday), you're not 
> measuring it properly. Please give us a breakdown of what those 90 MB are.
> 
> How much of that are pure pages containing discardable code?
> 
> Note that "top" and "ps" are not good tools to measure memory consumption.
> -- 
> Thiago Macieira - thiago.macieira (AT) intel.com
>  Software Architect - Intel Open Source Technology Center
> 
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