_/proc/stat vs /proc/uptime


 
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Old 05-08-2009
_/proc/stat vs /proc/uptime

Hi,

I am trying to calculate the CPU Usage by getting the difference between the idle time reported by /proc/stat at 2 different intervals. Now the 4th entry in the first line of /proc/stat will give me the 'idle time'. But I also came across /proc/uptime that gives me 2 entries : 1st one as the time in seconds since the system has been 'up' and the other entry being the number of seconds the system has been idle.

Dummy question : Should the 4th entry the /proc/stat and the 2nd entry /proc/uptime match each other ? If not, why ?

Thanks
 
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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)