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Old 06-10-2011, 01:07 PM
Denys Vlasenko
 
Default systemd: please stop trying to take over the world :)

Hi Lennart,

systemd is eating a lot more memory than any other init process
I ever played with.

Granted, systemd does a bit more that "typical" init, but I think
using *eleven plus megabytes* of malloced space is a bit much.

systemctl --all shows 258 units total on my machine,
thus systemd uses ~40 *KILO*bytes of state per unit?

I understand your desire to replace everything by systemd.
I really do. syslogd, klogd, mount, fsck, and a dozen other things
I forget or don't know. It's called "featuritis".
Now I hear about plans to incorporate ConsoleKit into it
(hearsay, so maybe it's not true).

Look where it is now:

Top:

Mem total:2035840 anon:431208 map:78924 free:419084
slab:91624 buf:108040 cache:942336 dirty:196 write:0
Swap total:4095996 free:4095996
PID VSZ VSZRW RSS (SHR)*DIRTY (SHR) STACK COMMAND
1818 624m 365m 185m 13472 155m 64 224 /usr/lib/firefox-4/firefox
1816 433m 189m 166m 17248 142m 0 204 evolution
1257 53672 40400 22664 6004 18336 4176 132 /usr/bin/Xorg
1 15384 11856 13664 1340 11752 0 132 /sbin/init
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^ 11.7 megs of malloc space

1839 275m 40224 24208 10572 11020 0 132 /usr/bin/gnome-terminal
1713 202m 45284 20308 9736 9604 576 132 /usr/libexec/xfce4/panel-plugins/xfce4-mixer-plugin
1843 171m 9448 20264 10012 8440 344 204 xchat
1770 152m 55672 19412 10972 6108 0 132 nautilus

It's the *fourth* largest process on my system!


# ldd `which systemd`
linux-gate.so.1 => (0x00a6b000)
libselinux.so.1 => /lib/libselinux.so.1 (0x414f6000)
libdbus-1.so.3 => /lib/libdbus-1.so.3 (0x41bc1000)
libpthread.so.0 => /lib/libpthread.so.0 (0x0019a000)
libudev.so.0 => /lib/libudev.so.0 (0x422c9000)
libwrap.so.0 => /lib/libwrap.so.0 (0x420fa000)
libpam.so.0 => /lib/libpam.so.0 (0x420e6000)
libaudit.so.1 => /lib/libaudit.so.1 (0x420cc000)
libcap.so.2 => /lib/libcap.so.2 (0x4152f000)
librt.so.1 => /lib/librt.so.1 (0x00be8000)
libc.so.6 => /lib/libc.so.6 (0x00295000)
/lib/ld-linux.so.2 (0x00276000)
libdl.so.2 => /lib/libdl.so.2 (0x00af6000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00f68000)
libnsl.so.1 => /lib/libnsl.so.1 (0x0095c000)
libattr.so.1 => /lib/libattr.so.1 (0x420c5000)

Why does systemd link against libpam?
systemd does logins now, not /bin/login or gdm or ...?

libattr? Does it mean it requires filesystem which implements
extended attributes? If not, why does it use libattr then?

libwrap? systemd is a network application now too?

libaudit? What systemd has in common with audit?

libdbus?... this is a lost battle I guess...

I propose to stop for a second and optimize systemd down
instead of trying to add even more bells and whistles to it.
Or else you'll soon end up linking against every /lib/lib*.so*

At the very least, I would like to see its memory consumption
to go down substantially.

It is an *init replacement*, not the replacement for everything.
One of init's goal is to be *simple* and *stable*.
Every new feature you add and library you link against
works against that goal.

To be honest, I doubt the wisdom of implementing service manager
as an init process. There is no inherent reason why it has to be init -
you can run it as *a child of init*, and keep init very simple.
Then, if service manager would crash, at least it doesn't
take system down with it...

--
vda


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