Update 20200922
I have tested LibreOffice for a while.
It did cause Xorg memory explosion again as explained below.
I am excerpting my own personal notes here, please bear with the rough form of
it.
The graph that I will attach next will show the point.
I started using a LibreOFfice program at 2020-09-06; this was a relaunch after
the last comment.
At timestamp = 20200921T2330, I checked Xorg memory usage tonight
after leaving LibreOffice open for over 11 days: Xorg RSS became
swollen to over 1 GB!
xorg RSS ... 1182768 kiB
The "free" status was terrible:
total used free shared buff/cache
available
Mem: 12144888 9761024 596696 710552 1787168
1353420
Swap: 1808384 1477752 330632
Three major users of Xorg memory:
LibreOffice Writer ( PID:1760594 ):
pixmap bytes : 334753205
1 - xfwm4 ( PID:1477670 ):
pixmap bytes : 141633828
Mozilla Firefox ( PID:1816946 ):
pixmap bytes : 44090522
The total of all three is ~520 MB.
LibreOffice alone is eating up over 334 MB of RAM!
NOTE: I did not use LibreOffice every day on this machine.
But I left that program open since it was opened on Sept 6.
I used the LO Writer occasionally to make notes now and then.
Now I am closing the LibreOffice program, see what happened.
Before LibreOffice doc was closed, the mem usage status was:
LibreOffice pixmap bytes usage dropped to 286360981 (pixmap bytes)
xfwm4 .... 131834529 (pixmap bytes)
firefox .... 44090522 (pixmap bytes)
xorg RSS .... 1203568 kiB => misleading, too
much dumped to swap!
Let's close LibreOffice; after closing (time marker = 20200922T0006) the
usage:
xfwm4 .... 98517409
firefox .... 44090522
xorg RSS .... 1192256 kiB
A few observations:
* As you can see above, xorg RSS was NOT significantly reduced even after I
closed
the LibreOffice. That was not the case with Firefox or with Xpra;
the memory usage dropped as soon as I closed those programs.
* I also remember from my past observations that *when this Xorg
memory explosion occurred*, the RSS of the xorg server is way higher than the
(rough) sum total of the pixmap memory consumption
reported by xrestop.
My fuzzy memory has it at about a factor of 4:
RSS(Xorg) ~ 4x sum(pixmap bytes reported by xrestop)
The example above did not quite support that though, but still, it
is a factor of more than two!
* I also looked at smaps:
(ref: smaps-1600747980-20200922T001300.txt).
That file indicates the largest memory occupied is in the heap:
$ grep -e '^[0-9a-f]' -e 'Dirty' smaps-1600747980-20200922T001300.txt
...
55aa90005000-55aad31ae000 rw-p 00000000 00:00 0
[heap]
Shared_Dirty: 0 kB
Private_Dirty: 1078916 kB
...
Now I closed Firefox as well: (after closure, timestamp: 20200922T0034)
xfwm4 .... 61755763
xorg RSS .... 1149028 kiB
Again, it looks like firefox X pixmap memory was freed ok (xorg RSS
dropped by ~50 MB), but not much lower.
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1884850
Title:
Xorg server uses unacceptably large amounts of memory (and keep
growing)
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1884850/+subscriptions
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