the lubuntu login manager should spare memory

[Jérôme]

Lightdm requires 32MB of memory, that is more than X !

Since lightdm just sleeps after login in, I think it is wasting memory.

Note that the "lxdm-binary" login manager is the only the 36th memory consumer 2364 kB of physical memory :
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j@j-VB:~$ echo -n " " ; ps axl | head -1 && ps axlO-r | awk '{ print NR " " $0 ; }' | head -38 | tail -6
   F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY TIME COMMAND
33 0 1000 1076 1009 20 0 74968 2648 poll_s S ? 0:00 xscreensaver -no-splash
34 0 1000 1240 1 20 0 68196 2484 poll_s S ? 0:00 /usr/lib/x86_64-linux-gnu/gconf/gconfd-2
35 0 1000 1109 1 20 0 47492 2476 poll_s S ? 0:00 /usr/lib/x86_64-linux-gnu/xfce4/xfconf/xfconfd
36 4 0 801 1 20 0 64568 2364 poll_s Ss ? 0:00 lxdm-binary
37 4 0 1 0 20 0 24452 2264 poll_s Ss ? 0:01 /sbin/init
38 5 104 1380 1 20 0 37688 2176 poll_s Ss ? 0:00 /usr/sbin/ntpd -p /var/run/ntpd.pid -g -u 104:109
j@j-VB:~$
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The "slim" login manager uses ~8 MB on amd64.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: lubuntu-default-settings 0.29
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Sat Nov 3 14:14:56 2012
InstallationDate: Installed on 2012-10-27 (7 days ago)
InstallationMedia: Lubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: lubuntu-default-settings
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.xdg.lubuntu.lxdm.lxdm.conf: 2012-10-27T13:46:52.831493

[Jérôme (jerome-bouat)]

I think that this bug isn't a duplicate of bug #1074279 since lubuntu can use another login manager (lxdm or slim for example).

The bug #1074279 is specific to lightdm.

[Jérôme (jerome-bouat)]

Note that gdm requires only 11,4 MB :
---
j@j-VB:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.10
Release: 12.10
Codename: quantal
j@j-VB:~$ ps axl | head -1 && ps axl | grep -i gdm | grep -v " \(grep\|/usr/bin/X\) "
F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY TIME COMMAND
4 0 848 1 20 0 202188 3144 poll_s Ssl ? 0:00 gdm
4 0 2852 848 20 0 294540 4408 poll_s Sl ? 0:00 /usr/lib/gdm/gdm-simple-slave --display-id /org/gnome/DisplayManager/Displays/_1
4 0 2982 2852 20 0 240360 4112 poll_s Sl ? 0:00 gdm-session-worker [pam/gdm-password]
j@j-VB:~$
---