03-31-2010
I'll try to explain the percentages to the best of my knowledge:
- idle: should be obvious
- user: the time the processes run in user space. That is loops and all in-memory operations
- kernel: the time spent in kernel space. Everything I/O runs in kernel space, that is: reading & writing files, network communication, user I/O (when not sleeping), loading/forking new processes, ...
- iowait: the time waiting for an I/O device to come ready. As long as this is 0, none of your processes had to wait for a disk to come ready, or was blocked by a slow net connection.
- swap: if this is zero it basically means none of your processes had to be swapped out, so your current memory installation is enough.
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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)