Public bug reported:
Binary package hint: update-motd
Hi,
The following issue applies to any recent Ubuntu distribution and architecture:
I have made an observation regarding the calculation of the system load within
the update-motd package:
When I was logging in to my 12-core /12GB RAM Server I got the message "System
information disabled due to load higher then 1"
But when I checked the system with top or htop barely 2 cores where occupied.
So I investigated the code in /etc/update-motd/50-landscape-sysinfo.
Next I informed myself about the calculation of the sysload and it's meaning.
Apparently, a load average of 1.0 means, that means that 1 CPU has been fully
occupied during the measuring period of 1/5/15 minutes...
So, on a 12 core machine a load of 1.0 is no danger and indicator for resource
shortage.
Therefor I have added some lines to /etc/update-motd/50-landscape-sysinfo:
#!/bin/sh
cput=`cat /proc/cpuinfo |grep processor|wc -l`
cpuc=`echo "scale=0;$cput/2"| bc -l`
#echo cpucores: $cpuc
#exit
if [ $(echo "`cut -f1 -d ' ' /proc/loadavg` < $cpuc.0" | bc) -eq 1 ]; then
echo
echo -n " System information as of "
/bin/date
echo
/usr/bin/landscape-sysinfo
else
echo
echo " System information disabled due to load higher than CPU Core-Count
$cpuc"
fi
Maybe I'm totaly wrong about my theory, then please teach me otherwise, else,
maybe it's worth to publish it?
Regards,
Felix
** Affects: update-motd (Ubuntu)
Importance: Undecided
Status: New
--
evaluation from the systemload on multiprocessor machines in
50-landscape-sysinfo
https://bugs.launchpad.net/bugs/675245
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