Ubuntu
at package

atd doesn't increase limit load factor on smp systems (upstart)

Bug #527723 reported by H.-Dirk Schmitt
22
This bug affects 4 people
Affects Status Importance Assigned to Milestone
at (Debian)
New
Unknown
at (Ubuntu)
Confirmed
Wishlist
Unassigned

Bug Description

Binary package hint: at

The old /etc/init.d/atd includes the following code:

# Arguments to atd
#
if uname -v |grep -q SMP >/dev/null
then
    # more as 1 CPU
    ARGS="-l 4.0"
else
    ARGS="-l 2.0"
fi

This is totally missing in the upstart job.
As consequence is atd running with the default load limit 1.5 since the migration to upstart.

Tags: precise
Revision history for this message
H.-Dirk Schmitt (dirk-computer42) wrote :

Changing the upstart job to the following will fix the issue
exec atd -l $(awk '/^processor/{cpu++}END{load=cpu-0.4; if (cpu < 2) load=1.5; print load;}' /proc/cpuinfo)

Revision history for this message
Scott James Remnant (Canonical) (canonical-scott) wrote :

The atd initscript at the point this was converted to Upstart *DID NOT* have this code, that makes this a wishlist only.

Unfortunately your patch is incorrect; Upstart will folllow the awk process pid, rather than atd's. Also this kind of grep/awk on every boot for everyone is exactly the kind of thing we do not want to do on every boot.

It would be better to patch atd's C code to call uname() itself and check for "SMP" in utsname.version

Changed in at (Ubuntu):
status: New → Confirmed
importance: Undecided → Wishlist
Revision history for this message
H.-Dirk Schmitt (dirk-computer42) wrote :

Another general solution could be the reinventing auf /etc/defaults for tweaking service confgurations.
e.g. cron loglevel coud be tweaked this way before the migration to upstart.

Revision history for this message
H.-Dirk Schmitt (dirk-computer42) wrote :

atd process pid:

/var/run/atd has the right pid of the atd process.
So I doesn't understand the point that upstart follows the awk pid.

Bug Watch Updater (bug-watch-updater)
Changed in at (Debian):
status: Unknown → New
H.-Dirk Schmitt (dirk-computer42)
tags: added: precise
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