[Interest] How to inspect a Qt Application memory usage?

[Andy]

I'm in the same boat and have unfortunately given up on valgrind.

I reported that bug that René referenced above (and Alexandru submitted the
patch for!). I tried to get engaged, but there just didn't seem to be much
interest in making it work on macOS 10.11+.

I use ASAN as well - very easy to add and it has found a few issues for me:

CONFIG += sanitizer sanitize_address sanitize_undefined

I have also used "Instruments" to do some profiling with some success, but
I really miss having everything integrated into Creator.

---
Andy Maloney  //  https://asmaloney.com
twitter ~ @asmaloney <https://twitter.com/asmaloney>



On Mon, Oct 22, 2018 at 3:19 PM Alexandru Croitor <alexandru.croitor at qt.io>
wrote:

> Valgrind hasn't worked for me on macOS since 10.11 or 10.10, can't recall.
>
>
> From my observations, there are no interested and / or qualified people to
> fix the mac port, and it's an ever moving target because of kernel changes
> with each released version.
>
>
> I've submitted a patch and it took around six months to get it merged.
>
>
> Bug issues seem to be triaged, and the occasional external contributor
> comes in with fixes, but from my point of view, it has not been enough to
> get it to a workable state.
>
>
> Depending on what I'm trying to do, I resort to using
>
> 1) malloc debug
> https://developer.apple.com/library/archive/documentation/Performance/Conceptual/ManagingMemory/Articles/MallocDebug.html
>
> 2) Instruments
>
> 3) Address sanitizer
>
> 4) dtrace
>
>
> Instruments has a "Leaks" profile, which provides statistics for on
> allocations, stack traces, etc. You might want to give it a try.
> ------------------------------
> *From:* Interest <interest-bounces+alexandru.croitor=qt.io at qt-project.org>
> on behalf of Elvis Stansvik <elvstone at gmail.com>
> *Sent:* Monday, October 22, 2018 6:26:17 PM
> *To:* Nuno Santos
> *Cc:* interest at qt-project.org Interest
> *Subject:* Re: [Interest] How to inspect a Qt Application memory usage?
>
> Den mån 22 okt. 2018 kl 18:04 skrev Nuno Santos <nunosantos at imaginando.pt
> >:
> >
> > Elvis,
> >
> > I have just tried that it resulted in this. I’m not familiar with
> valgrind output. Does this look good to you?
> >
> >
> > --45024-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option
> > --45024-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option (repeated
> 2 times)
> > --45024-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option (repeated
> 4 times)
> > --45024-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option (repeated
> 8 times)
> > QML debugging is enabled. Only use this in a safe environment.
> > ==45024==
> > ==45024== Process terminating with default action of signal 11 (SIGSEGV)
> > ==45024==  Access not within mapped region at address 0x18
> > ==45024==    at 0x1077D6E3A: _pthread_wqthread (in
> /usr/lib/system/libsystem_pthread.dylib)
> > ==45024==    by 0x1077D6BE8: start_wqthread (in
> /usr/lib/system/libsystem_pthread.dylib)
> > ==45024==  If you believe this happened as a result of a stack
> > ==45024==  overflow in your program's main thread (unlikely but
> > ==45024==  possible), you can try to increase the size of the
> > ==45024==  main thread stack using the --main-stacksize= flag.
> > ==45024==  The main thread stack size used in this run was 8388608.
> > --45024:0:schedule VG_(sema_down): read returned -4
> > ==45024==
> > [1]    45024 segmentation fault  valgrind --tool=massif XPTO.app
>
> Hm, I'm not too familiar with valgrind output, but that looks like the
> application crashed due to an access violation. Perhaps you should run
> it in a memory error checker first to make pinpoint the violation?
> Valgrind has one called memcheck (--tool=memcheck).
>
> Elvis
>
> >
> > Thx!
> >
> > Nuno
> >
> > On 22 Oct 2018, at 16:54, Elvis Stansvik <elvstone at gmail.com> wrote:
> >
> > I used valgrind with valgrind --tool=massif myApp to track down a memory
> issue just today actually, and it worked out great, but I don't know if it
> works on macOS (this was on Linux). I used massif-visualizer for
> visualization.
> >
> > I've been meaning to check out heaptrack but haven't gotten around to it.
> >
> > Elvis
> >
> > Den mån 22 okt. 2018 16:50Nuno Santos <nunosantos at imaginando.pt> skrev:
> >>
> >> Hi,
> >>
> >> What tool(s) do you people suggest in order to investigate where is the
> memory being spent on a Qt application?
> >>
> >> Thanks!
> >>
> >> Nuno
> >> _______________________________________________
> >> Interest mailing list
> >> Interest at qt-project.org
> >> http://lists.qt-project.org/mailman/listinfo/interest
> >
> >
> _______________________________________________
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