Something strange with RAM consumption

[Nicolas Dufresne]

Hi,

Le mercredi 26 juin 2024 à 15:56 +0300, Deymos s via gstreamer-devel a écrit :
> I am developing a video wall for 32-64 streams, I faced the problem of
> increasing memory when restarting streams I have an example illustrating my
> problem. (Here is 2 branches with qt5 and qt6 realization)
> Example: https://github.com/Deymoss/Rtsp-player

A quick look at your code gives me the impression that nothing will pop the
messages from the GstBus, which will cause a run-time leak (but it get freed  at
shutdown). If you have glib enabled in your QT setup, calling
gst_bus_add_watch() or gst_bus_add_signal_watch() could possibly solve the
issue. If you don't you will need a thread to pop the messages and process them,
so they don't accumulate forever.

Nicolas

> When I start the application, a pipeline is created, as a result, the
> application initially takes 54MB of RAM, when I start the stream, the RAM
> consumption increases to ~ 110 MB, when I close the stream, the memory is not
> freed, when I run the same stream again, the amount of RAM increases to 120
> MB, and so on, 36 streams eats 5 gb RAM for 12 hours, the same is true for
> file files descriptors (I suspect BUS creates them)
> How to properly clear the memory and all information about the stream when
> closing?
> Here are GST_TRACER and ASAN output:
> 0:00:30.915950297 79361 0x619000078350 TRACE             GST_TRACER :0::
> object-alive, type-name=(string)GstProxyPad, address=(gpointer)0x629000092380,
> description=(string)<sink:proxypad1>, ref-count=(uint)1, trace=(string);
> 
> 0:00:30.915977127 79361 0x619000078350 TRACE             GST_TRACER :0::
> object-alive, type-name=(string)GstGhostPad, address=(gpointer)0x62900008e2d0,
> description=(string)<'':sink>, ref-count=(uint)1, trace=(string);
> 
> 0:00:30.915992116 79361 0x619000078350 TRACE             GST_TRACER :0::
> object-alive, type-name=(string)GstGLWrappedContext,
> address=(gpointer)0x62500024f610, description=(string)<glwrappedcontext0>,
> ref-count=(uint)1, trace=(string);
> 
> 0:00:30.916002956 79361 0x619000078350 TRACE             GST_TRACER :0::
> object-alive, type-name=(string)GstGLWindowX11,
> address=(gpointer)0x6290000a2ba0, description=(string)<glwindowx11-0>, ref-
> count=(uint)1, trace=(string);
> 
> 0:00:30.916014989 79361 0x619000078350 TRACE             GST_TRACER :0::
> object-alive, type-name=(string)GstGLDisplayX11,
> address=(gpointer)0x62500024c650, description=(string)<gldisplayx11-1>, ref-
> count=(uint)4, trace=(string);
> 
> 0:00:30.916022784 79361 0x619000078350 TRACE             GST_TRACER :0::
> object-alive, type-name=(string)GstGLContextGLX,
> address=(gpointer)0x6250004340a0, description=(string)<glcontextglx0>, ref-
> count=(uint)1, trace=(string);
> 
> ** (rtsp-player:79361): WARNING **: 15:36:23.197: Leaks detected and logged
> under GST_DEBUG=GST_TRACER:7
> 
> =================================================================
> ==79361==ERROR: LeakSanitizer: detected memory leaks
> 
> Direct leak of 49152 byte(s) in 2 object(s) allocated from:
>     #0 0x72a00c2b4887 in __interceptor_malloc
> ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145
>     #1 0x72a00bda1738 in g_malloc (/lib/x86_64-linux-gnu/libglib-
> 2.0.so.0+0x5e738)
> 
> Direct leak of 8832 byte(s) in 1 object(s) allocated from:
>     #0 0x72a00c2b4887 in __interceptor_malloc
> ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145
>     #1 0x729fffeaa7b3  (/lib/x86_64-linux-gnu/libGLX_mesa.so.0+0x317b3)
> 
> Direct leak of 2560 byte(s) in 10 object(s) allocated from:
>     #0 0x72a00c2b4887 in __interceptor_malloc
> ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145
>     #1 0x72a00228ca21  (/lib/x86_64-linux-gnu/libfontconfig.so.1+0x1fa21)
> 
> Direct leak of 56 byte(s) in 2 object(s) allocated from:
>     #0 0x72a00c2b4887 in __interceptor_malloc
> ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145
>     #1 0x72a002275ce9  (/lib/x86_64-linux-gnu/libfontconfig.so.1+0x8ce9)
> 
> Indirect leak of 608 byte(s) in 19 object(s) allocated from:
>     #0 0x72a00c2b4a57 in __interceptor_calloc
> ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:154
>     #1 0x72a00228f51e  (/lib/x86_64-linux-gnu/libfontconfig.so.1+0x2251e)
> 
> Indirect leak of 198 byte(s) in 18 object(s) allocated from:
>     #0 0x72a00c25b9a7 in __interceptor_strdup
> ../../../../src/libsanitizer/asan/asan_interceptors.cpp:454
>     #1 0x72a00228c4f7 in FcValueSave (/lib/x86_64-linux-
> gnu/libfontconfig.so.1+0x1f4f7)
> 
> SUMMARY: AddressSanitizer: 61406 byte(s) leaked in 52 allocation(s).

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