01-08-2017
You seem to be running these commands from a non global zone. You are missing CPU usage generated in other zones, including the global one. Monitoring need to be done from the global zone, as long as dtrace analysis.
Quote:
Naturally, I am thinking that if I have 1 cpu and my load=1 all the time, my CPU is 100% busy.
That is an oversimplification. CPU load is indeed based on measures of the run queue size and the number of running processes, but as it is a floating average, a load of 1 doesn't necessarily mean one CPU is 100% busy.
CPU utilization might be smaller if for example, two processes are competing for the same CPU 50% of the time and then are idle for the remaining 50% of the time. You'll have a load of 1 and a CPU 50% busy.
Should you have 10 processes competing for a single CPU 10% of the time, then idling for 90% of the time, you will still be observing a load of 1 but a CPU 10% busy.
Last edited by jlliagre; 01-08-2017 at 10:09 AM..
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UPTIME(1) Linux User's Manual UPTIME(1)
NAME
uptime - Tell how long the system has been running.
SYNOPSIS
uptime
uptime [-V]
DESCRIPTION
uptime gives a one line display of the following information. The current time, how long the system has been running, how many users are
currently logged on, and the system load averages for the past 1, 5, and 15 minutes.
This is the same information contained in the header line displayed by w(1).
System load averages is the average number of processes that are either in a runnable or uninterruptable state. A process in a runnable
state is either using the CPU or waiting to use the CPU. A process in uninterruptable state is waiting for some I/O access, eg waiting for
disk. The averages are taken over the three time intervals. Load averages are not normalized for the number of CPUs in a system, so a
load average of 1 means a single CPU system is loaded all the time while on a 4 CPU system it means it was idle 75% of the time.
FILES
/var/run/utmp
information about who is currently logged on
/proc process information
AUTHORS
uptime was written by Larry Greenfield <greenfie@gauss.rutgers.edu> and Michael K. Johnson <johnsonm@sunsite.unc.edu>.
Please send bug reports to <albert@users.sf.net>
SEE ALSO
ps(1), top(1), utmp(5), w(1)
Cohesive Systems 26 Jan 1993 UPTIME(1)