Hummmm, if that is true than I'm probably again looking for an unknown issue.
The truth is that I don't have an iPad Air so I'm blind. I have already identified some useless memory usages. I found that rectangles and loaders can actually spend a lot of memory. If I can replace them for items it is better. -- Nuno Santos No dia 21/04/2015, às 12:58, Harri Pasanen <ha...@mpaja.com> escreveu: > 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 >> +351 91 621 69 62 >> >>> On 21 Apr 2015, at 12:36, Harri Pasanen <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 >>> >>> >>> _______________________________________________ >>> Interest mailing list >>> Interest@qt-project.org >>> http://lists.qt-project.org/mailman/listinfo/interest >
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