check_load --- divide by number of cpus?

[Sandor W. Sklar]

On May 8, 2008, at 6:49 AM, Terry wrote:

> I am sitting here racking my brain on this one.  Is dividing the load
> average by the number of CPUs a smart thing to do?  the 'uptime'
> command on a box does not do this.  So, if I have an 8 core box
> sitting with a load average of 8, its the same as a single core box
> sitting with a load average of 1?  I'll see the same type of server
> response?  Thoughts?

This is what we do on our Sun boxes, in a custom "check_system" script:

# Set 1,5,15 minute load average thresholds based on CPU count
CPU=`psrinfo | wc -l`
LOAD1=$((CPU*20)); test $LOAD1 -lt 50 && LOAD1=50
LOAD5=$((CPU*15)); test $LOAD5 -lt 30 && LOAD5=30
LOAD15=$((CPU*10)); test $LOAD15 -lt 15 && LOAD15=15

LOAD_W=$LOAD1,$LOAD5,$LOAD15
LOAD_C=$((LOAD1*5)),$((LOAD5*5)),$((LOAD15*5))

... and on our linux systems ...

CPU=`grep "^processor" /proc/cpuinfo | wc -l`
LOAD1=$((CPU*20)); test $LOAD1 -lt 50 && LOAD1=50
LOAD5=$((CPU*15)); test $LOAD5 -lt 30 && LOAD5=30
LOAD15=$((CPU*10)); test $LOAD15 -lt 15 && LOAD15=15

LOAD_W=$LOAD1,$LOAD5,$LOAD15
LOAD_C=$((LOAD1*5)),$((LOAD5*5)),$((LOAD15*5))

... and we then parse the output of "uptime".

It would really cool if the "check_load" plugin would take args like:

	check_load -w 20x,15x,10x -c 100x,75x,50x

... but what I've got above has been doing what we want just fine.

	-s-

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