Thiago, Thanks for your explanation.
Right now I don’t have a clue on how should I correctly measure occupied by one Qt app on iOS environment. I need to dig it out. Thanks, Regards, Nuno > On 21 Apr 2015, at 18:30, Thiago Macieira <thiago.macie...@intel.com> wrote: > > On Tuesday 21 April 2015 18:16:57 Nuno Santos wrote: >> 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. > > The point is that you're not measuring memory properly. > > Let me take the example of Qt Creator > > F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY TIME COMMAND > 0 1000 51459 2285 20 0 3085928 127168 - Sl+ pts/0 9:12 > bin/qtcreator > > How much memory is it consuming? Would you answer 2.94 GB? Maybe 124 MB? > > The answer is yes and no for both numbers. It depends on what you're > measuring. And there are more numbers: > > $ ~/src/owntools/rssanalyse/rssanalyse.pl `pidof qtcreator` > Total mapped memory: 3085932 kB > of which is padding: 1933552 kB > of which swapped out: 669832 kB > of which likely stack: 32908 kB mapped, 108 kB resident (64 kB main, 44 kB > aux threads) > of which are resident: 130152 kB, 123534 kB proportionally shared > total anonymous: 98168 kB (75.4%) > Shared: 10200 kB total (7.8% of RSS) > Breakdown: 3476 kB clean (34.1%), 6724 kB dirty (65.9%) > 3100 kB code (30.4%), 376 kB RO data (3.7%), 6724 kB > RW data (65.9%) > 0 kB heap (0.0%), 0 kB stack (0.0%), 0 kB other > (0.0%) > Private: 119952 kB total (92.2% of RSS) > Breakdown: 32600 kB clean (27.2%), 87352 kB dirty (72.8%) > 21768 kB code (18.1%), 1052 kB RO data (0.9%), 360 kB > RW data (0.3%) > 96652 kB heap (80.6%), 108 kB stack (0.1%), 12 kB > other (0.0%) > > The number in VSZ is usually not quoted because, as you can see, 62% of it is > *padding* between sections of RAM. > > 124 MB is how much it really uses in RAM, but 10 of those is clean & shared > and another 32 MB is clean & sharable (but not shared, because no other > process loads the Qt Creator libraries). All clean pages can be discarded on > memory pressure and reloaded from disk. > > Then there's 654 MB that is swapped out. > -- > Thiago Macieira - thiago.macieira (AT) intel.com > Software Architect - Intel Open Source Technology Center > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
