_/proc/stat vs /proc/uptime

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_/proc/stat vs /proc/uptime


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 ?


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Sys::Statistics::Linux::PgSwStats(3pm)			User Contributed Perl Documentation		    Sys::Statistics::Linux::PgSwStats(3pm)

Sys::Statistics::Linux::PgSwStats - Collect linux paging and swapping statistics. SYNOPSIS
use Sys::Statistics::Linux::PgSwStats; my $lxs = Sys::Statistics::Linux::PgSwStats->new; $lxs->init; sleep 1; my $stat = $lxs->get; Or my $lxs = Sys::Statistics::Linux::PgSwStats->new(initfile => $file); $lxs->init; my $stat = $lxs->get; DESCRIPTION
Sys::Statistics::Linux::PgSwStats gathers paging and swapping statistics from the virtual /proc filesystem (procfs). For more information read the documentation of the front-end module Sys::Statistics::Linux. PAGING AND SWAPPING STATISTICS
Generated by /proc/stat or /proc/vmstat. pgpgin - Number of pages the system has paged in from disk per second. pgpgout - Number of pages the system has paged out to disk per second. pswpin - Number of pages the system has swapped in from disk per second. pswpout - Number of pages the system has swapped out to disk per second. The following statistics are only available by kernels from 2.6. pgfault - Number of page faults the system has made per second (minor + major). pgmajfault - Number of major faults per second the system required loading a memory page from disk. METHODS
new() Call "new()" to create a new object. my $lxs = Sys::Statistics::Linux::PgSwStats->new; Maybe you want to store/load the initial statistics to/from a file: my $lxs = Sys::Statistics::Linux::PgSwStats->new(initfile => '/tmp/pgswstats.yml'); If you set "initfile" it's not necessary to call sleep before "get()". It's also possible to set the path to the proc filesystem. Sys::Statistics::Linux::PgSwStats->new( files => { # This is the default path => '/proc', stat => 'stat', vmstat => 'vmstat', } ); init() Call "init()" to initialize the statistics. $lxs->init; get() Call "get()" to get the statistics. "get()" returns the statistics as a hash reference. my $stat = $lxs->get; raw() Get raw values. EXPORTS
No exports. SEE ALSO
Please report all bugs to <jschulz.cpan(at)bloonix.de>. AUTHOR
Jonny Schulz <jschulz.cpan(at)bloonix.de>. COPYRIGHT
Copyright (c) 2006, 2007 by Jonny Schulz. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-03-09 Sys::Statistics::Linux::PgSwStats(3pm)

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