Hi all,
while looking at the SAGE FAQ here [1], I noticed the link to Trac #381 [2]
(the link is broken, on the FAQ page, though).
One option which is not mentioned, but which is extremely convenient,
is to run Sage using a systemd user session. The Arch Linux packages
for Sage include the file
/usr/lib/systemd/user/sage.service
which is just
[Unit]
Description=A free open-source mathematics software system
[Service]
ExecStart=/opt/sage/sage -n
[Install]
WantedBy=default.target
Now when I want to run a Sage notebook as a daemon, I can run
$ systemctl --user start sage
and get its status with
$ systemctl --user status sage
sage.service - A free open-source mathematics software system
Loaded: loaded (/usr/lib/systemd/user/sage.service; disabled)
Active: active (running) since Sun 2014-02-16 00:14:11 EST; 9s ago
Main PID: 19292 (bash)
CGroup: /user.slice/user-1000.slice/user@1000.service/sage.service
├─19292 bash /opt/sage/sage -n
├─19301 python /opt/sage/src/bin/sage-notebook
└─19353 python /opt/sage/local/bin/twistd
--pidfile=sage_notebook.sagenb/sagenb.pid -ny
sage_notebook.sagenb/twistedconf.tac
Feb 16 00:14:11 noether systemd[537]: Starting A free open-source
mathematics software system...
Feb 16 00:14:11 noether systemd[537]: Started A free open-source
mathematics software system.
Or I can run
$ systemctl --user enable sage.service
to launch the Sage server automatically every time I log in -- and this
is all done as my user, not as root.
There’s a bunch of nice stuff that comes for free this way. For instance, if I
want to prevent Sage from eating my RAM, I just create (as root)
/etc/systemd/user/sage.service
with, say
.include /usr/lib/systemd/user/sage.service
[Service]
MemoryLimit=1G
and then the process control group Sage runs in is limited to 1G memory
across all of its child processes. You can also do all kinds of other
resource management this way -- CPU priority, CPU affinity, swappiness,
IO scheduler, etc.
This approach requires systemd and is Linux-specific, but as every major
Linux distribution is either using systemd now or plans to move to it in
the future, it seems like it might be worthwhile for Sage to ship
systemd .service files for Linux users.
Cheers,
Henry de Valence
[1]:
http://www.sagemath.org/doc/faq/faq-usage.html#how-do-i-run-sage-in-daemon-mode-i-e-as-a-service
[2]: http://trac.sagemath.org/ticket/381
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