Hi folks, an update on my VLC measurement. I finally did that "vlc
-vvv", please see attachments for the stderr. I don't see anything
interesting there. But I did make snapshots of the vsize, rss, and the
"smaps" file under the /procfs/$PID/smaps --they are also attached. I
played the same video for less than 12 minutes then paused it. Then let
the window sit there like what I did before. The observation covered for
about 20 hours total.
The file "vlc-vvv-usage-wirawan2-Sisters_M16.txt" contains the output of
"ps faux" commands taken over regular interval (timestamp shown as cols
1-2) for this one process.
I plotted the vsize and rss from that ps output file (using pandas, in
case you're curious), I did see linear growth in the memory usage in
several stretches of time. And these stretches did not grow with the
same rate. I omitted the first line of the measurement because it is not
relevant (vlc was being started).
The smap files are timestamped with the UNIX time and the date/time--the
meaning should be clear from the filename. I supplied you three
snapshots:
* `smaps-1596468720-20200803T113241.txt`: about 5 minutes into the video
playing (still running)
* `smaps-1596510832-20200803T231352.txt`: about 12 hours later (video paused)
* `smaps-1596540657-20200804T073057.txt`: about 20 hours later (video paused)
I did see some new memory regions allocated and it was not clear what
they are. But that's all the clue I could gather from my testings. Hope
all these help pinpointing the cause of the memory leak.
Here is an example analysis:
~~~
$ diff -y --width=200 <(grep -e '^[0-9a-f]+-[0-9a-f]+' -e 'Dirty' -e Rss
smaps-1596468720-20200803T113241.txt) <(grep -e '^[0-9a-f]+-[0-9a-f]+' -e
'Dirty' -e Rss smaps-1596510832-20200803T231352.txt) |less
...
7fc19ec74000-7fc19ed74000 rw-s 00000000 00:1a 264 /i915
(deleted) | 7fc188000000-7fc18b61a000 rw-p 00000000 00:00 0
Rss: 404 kB
| Rss: 55400 kB
Shared_Dirty: 0 kB
Shared_Dirty: 0 kB
Private_Dirty: 404 kB
| Private_Dirty: 55400 kB
7fc19ed74000-7fc19ed88000 rw-s 00000000 00:1a 802 /i915
(deleted) | 7fc18b61a000-7fc18c000000 ---p 00000000 00:00 0
Rss: 4 kB
| Rss: 0 kB
Shared_Dirty: 0 kB
Shared_Dirty: 0 kB
Private_Dirty: 4 kB
| Private_Dirty: 0 kB
> 7fc190000000-7fc198000000 rw-p 00000000 00:00 0
> Rss: 131072 kB
> Shared_Dirty: 0 kB
> Private_Dirty: 131072 kB
> 7fc198000000-7fc19c000000 rw-p 00000000 00:00 0
> Rss: 65536 kB
> Shared_Dirty: 0 kB
> Private_Dirty: 65536 kB
> 7fc19ec88000-7fc19ed88000 rw-s 00000000 00:1a 243
/i915 (deleted)
> Rss: 716 kB
> Shared_Dirty: 0 kB
> Private_Dirty: 716 kB
7fc19ed88000-7fc19ed90000 rw-s 00000000 00:1a 799 /i915
(deleted) 7fc19ed88000-7fc19ed90000 rw-s 00000000 00:1a 799
/i915 (deleted)
Rss: 32 kB
Rss: 32 kB
Shared_Dirty: 0 kB
Shared_Dirty: 0 kB
Private_Dirty: 32 kB
Private_Dirty: 32 kB
~~~
Left column is the 5-minute smaps, and the right column is the 12-hour
smaps.
Wirawan
** Attachment added: "snapshot of "ps faux""
https://bugs.launchpad.net/ubuntu/+source/vlc/+bug/1888558/+attachment/5398671/+files/vlc-vvv-usage-wirawan2-Sisters_M16.txt
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https://bugs.launchpad.net/bugs/1888558
Title:
VLC is using up to 2 GB of RAM just to play a regular 720px HD video
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