less(3pm) [mojave man page]

less(3pm)						 Perl Programmers Reference Guide						 less(3pm)

NAME

       less - perl pragma to request less of something

SYNOPSIS

	   use less 'CPU';

DESCRIPTION

       This is a user-pragma. If you're very lucky some code you're using will know that you asked for less CPU usage or ram or fat or... we just
       can't know. Consult your documentation on everything you're currently using.

       For general suggestions, try requesting "CPU" or "memory".

	   use less 'memory';
	   use less 'CPU';
	   use less 'fat';

       If you ask for nothing in particular, you'll be asking for "less 'please'".

	   use less 'please';

FOR MODULE AUTHORS

       less has been in the core as a "joke" module for ages now and it hasn't had any real way to communicating any information to anything.
       Thanks to Nicholas Clark we have user pragmas (see perlpragma) and now "less" can do something.

       You can probably expect your users to be able to guess that they can request less CPU or memory or just "less" overall.

       If the user didn't specify anything, it's interpreted as having used the "please" tag. It's up to you to make this useful.

	 # equivalent
	 use less;
	 use less 'please';

   "BOOLEAN = less->of( FEATURE )"
       The class method "less->of( NAME )" returns a boolean to tell you whether your user requested less of something.

	 if ( less->of( 'CPU' ) ) {
	     ...
	 }
	 elsif ( less->of( 'memory' ) ) {

	 }

   "FEATURES = less->of()"
       If you don't ask for any feature, you get the list of features that the user requested you to be nice to. This has the nice side effect
       that if you don't respect anything in particular then you can just ask for it and use it like a boolean.

	 if ( less->of ) {
	     ...
	 }
	 else {
	     ...
	 }

CAVEATS

       This probably does nothing.
       This works only on 5.10+
	   At least it's backwards compatible in not doing much.

perl v5.18.2							    2013-11-04								 less(3pm)

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

NAME

       Sys::Statistics::Linux::CpuStats - Collect linux cpu statistics.

SYNOPSIS

	   use Sys::Statistics::Linux::CpuStats;

	   my $lxs = Sys::Statistics::Linux::CpuStats->new;
	   $lxs->init;
	   sleep 1;
	   my $stats = $lxs->get;

       Or

	   my $lxs = Sys::Statistics::Linux::CpuStats->new(initfile => $file);
	   $lxs->init;
	   my $stats = $lxs->get;

DESCRIPTION

       Sys::Statistics::Linux::CpuStats gathers cpu statistics from the virtual /proc filesystem (procfs).

       For more information read the documentation of the front-end module Sys::Statistics::Linux.

CPU STATISTICS

       Generated by /proc/stat for each cpu (cpu0, cpu1 ...). cpu without a number is the summary.

	   user    -  Percentage of CPU utilization at the user level.
	   nice    -  Percentage of CPU utilization at the user level with nice priority.
	   system  -  Percentage of CPU utilization at the system level.
	   idle    -  Percentage of time the CPU is in idle state.
	   total   -  Total percentage of CPU utilization.

       Statistics with kernels >= 2.6.

	   iowait  -  Percentage of time the CPU is in idle state because an I/O operation
		      is waiting to complete.
	   irq	   -  Percentage of time the CPU is servicing interrupts.
	   softirq -  Percentage of time the CPU is servicing softirqs.
	   steal   -  Percentage of stolen CPU time, which is the time spent in other
		      operating systems when running in a virtualized environment (>=2.6.11).

METHODS

   new()
       Call "new()" to create a new object.

	   my $lxs = Sys::Statistics::Linux::CpuStats->new;

       Maybe you want to store/load the initial statistics to/from a file:

	   my $lxs = Sys::Statistics::Linux::CpuStats->new(initfile => '/tmp/cpustats.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::CpuStats->new(
	       files => {
		   # This is the default
		   path => '/proc'
		   stat => 'stat',
	       }
	   );

   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 $stats = $lxs->get;

   raw()
       Get raw values.

EXPORTS

       No exports.

SEE ALSO

       proc(5)

REPORTING BUGS

       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::CpuStats(3pm)