I referred to used memory figures.
For the same device, real vs. simulated, the simulator shows 2-2.5 times
bigger memory consumption, with the sample size of 2 apps I tried with.
If you suspect images are what is using the memory, you can limit that
by dropping to C++ and using QQuickImageProvider to serve the images on
demand.
Harri
On 21/04/2015 13:43, Nuno Santos wrote:
Harri,
That doesn’t make sense. Simulator is just displaying the real
resolution of the device. In retina case 2048x1536. Why would it
display something 2.5 times bigger for no apparent reason.
I have an iPad 2 and my app was designed in a 1024x768 base. My tests
on a real device were on this base. The app memory usage on this
conditions on the iPad are about 50Mb.
When we go to retina display, the problem is that the display cache
multiplies by 4 because the resolution has doubled in both axis. This
leads to an increase in memory. This is my guess.
I also think that Qt is loading all the libs at once. I cannot explain
such a big memory footprint for an empty app.
I would like some insights from Qt dev people.
I have been analysing, code portion by code portion and I have already
found out interesting things that I will share later.
Regards,
Nuno Santos
Founder / CEO / CTO
www.imaginando.pt <http://www.imaginando.pt>
+351 91 621 69 62
On 21 Apr 2015, at 12:36, Harri Pasanen <ha...@mpaja.com
<mailto:ha...@mpaja.com>> wrote:
On 21/04/2015 10:38, 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!
Note that the simulator displays about 2.5 times bigger figures than an
actual device.
(Some if it has to do with architecture, Intel seems to need more memory
and space than arm).
Just my 2 cents,
Harri
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