02-19-2008
Quote:
Originally Posted by
yeazas
Hehehe..actually I do not understand when should we decide that server is heavy utilization or not. From what I believe and understand, since the CPU LOAD average is still not reach 100%, the server is still considered ok. Hopefully you can help to expalin on how to decide that server is heavy utilize or not. Thank you...
Well, when you say (as you did in your first post) "Since last week our server become too slow" that is a pretty good clue. Pay attention when the users of a system say that they notice a difference.
Load average is the average number of processes that want a cpu (or will want want a cpu
very soon) but cannot get one. But it also includes currently running processes (since they too must want a cpu). It is not a percentage. 20 is generally very high but with enough cpu's it might be ok. If you had 32 cpus, some of them would be idle and you would have no problem at all.
The percentages are indicated by this symbol % (which we call a per cent sign). Look at your idle percentage. It is zero. That means you are maxed out. Adding cpu's would probably help.
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UPTIME(1) User Commands UPTIME(1)
NAME
uptime - Tell how long the system has been running.
SYNOPSIS
uptime [options]
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.
OPTIONS
-p, --pretty
show uptime in pretty format
-h, --help
display this help text
-s, --since
system up since, in yyyy-mm-dd HH:MM:SS format
-V, --version
display version information and exit
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>
SEE ALSO
ps(1), top(1), utmp(5), w(1)
REPORTING BUGS
Please send bug reports to <procps@freelists.org>
procps-ng December 2012 UPTIME(1)