08-28-2006
vmstat vs uptime?
what is the relation between the output of vmstat
(cpu/us, cpu/sy, cpu/id) and output of uptime command?
it is said that
"one can think of load average as a percentage of system
utilization during the respective time period"
i have load average values obtained from uptime command
they are varying between 0-4.4 and i have output values for
vmstat it is constant for all (user %2,system %1 and idle %40)
measurements are done for 3.5 hours period.
do you have any idea?
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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)