CPU Utilization/Saturation


 
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Operating Systems Solaris CPU Utilization/Saturation
# 1  
Old 08-18-2008
CPU Utilization/Saturation

Hi! I have following problem: How can I calculate 100 % CPU utilisation if I have 8 chip (SPARCV6 dual core)? Which load is 100 % CPU utilisation? Hope someone can help!
# 2  
Old 08-19-2008
You can use "mpstat 2" to display individual processor load and "prstat" to identify what processes are using the CPUs.
# 3  
Old 08-19-2008
prstat is much accurate enough..
# 4  
Old 08-19-2008
mpstat shows statistics prstat doesn't. No accuracy issue here.

I must confess I'm not sure I understood exactly what the OP question is really about though ...

You can reach a 100% CPU load with a single process on a multi-CPU & multi-core system assuming that process is multi-threaded.
# 5  
Old 08-19-2008
There is a small code called cyclesoak (zc) which does a subtractive method for measuring CPU utilization. It is more accurate. Basically it launches a number of processes, to eat up 100% of the CPU when there is no load. Then as you load the CPU with other processes the amount of work its able to do goes down, this gives the CPU utilization of everything else. Pretty easy to integrate into something like gkrellm. You'd have to google for it b/c I don't know a website for it off hand.
# 6  
Old 08-19-2008
i tell you what... there is no chance i would run this code on a production server Smilie
# 7  
Old 08-20-2008
Neither on my laptop. That battery life and environment unfriendly hack looks a really bad idea to me.
Prstat has microstate accounting for those wanting more accurate load metrics.
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