Sar question

[danhodges99]

Hi all,

With Sar, it gives you the CPU usage for the last x minutes etc, does anyone know if this is an average value when the machine in question has multiple CPU's, or simply just a reading of CPU #1?

Ta.

 

[julianbarnett]

It is an average of all CPUs - e.g. a looping process on one CPU of a 2 CPU machine will result in a sar %cpu of 50%. mpstat will give you a more detailed per CPU output

 

[jimbopalmer]

sar -q is useful to determine if your load frequently exceeds the number of CPUs available to service the load.

the second column indicates the % of time at least one job was waiting for a CPU, the first column indicates the average number of jobs waiting when at least one job was waiting

The other columns (which Sun claims will be empty) actually show the number of jobs swapped entirely out of memory and % of time that happens I tried to remain child-like, all I acheived was childish.

 

[danhodges99]

Cheers guys!

 

[Edcrosbys]

Dan,


This may be overkill, but we started using the se toolkit for our Sun Monitoring. If nothing else, it's quick and consise information.

http://www.setoolkit.com/

Ed