/usr/share/perl5/Sys/Statistics/Linux/ProcStats.pm is in libsys-statistics-linux-perl 0.66-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Sys::Statistics::Linux::ProcStats - Collect linux process statistics.
=head1 SYNOPSIS
use Sys::Statistics::Linux::ProcStats;
my $lxs = Sys::Statistics::Linux::ProcStats->new;
$lxs->init;
sleep 1;
my $stat = $lxs->get;
Or
my $lxs = Sys::Statistics::Linux::ProcStats->new(initfile => $file);
$lxs->init;
my $stat = $lxs->get;
=head1 DESCRIPTION
Sys::Statistics::Linux::ProcStats gathers process statistics from the virtual F</proc> filesystem (procfs).
For more information read the documentation of the front-end module L<Sys::Statistics::Linux>.
=head1 IMPORTANT
I renamed key C<procs_blocked> to C<blocked>!
=head1 LOAD AVERAGE STATISTICS
Generated by F</proc/stat> and F</proc/loadavg>.
new - Number of new processes that were produced per second.
runqueue - The number of currently executing kernel scheduling entities (processes, threads).
count - The number of kernel scheduling entities that currently exist on the system (processes, threads).
blocked - Number of processes blocked waiting for I/O to complete (Linux 2.5.45 onwards).
running - Number of processes in runnable state (Linux 2.5.45 onwards).
=head1 METHODS
=head2 new()
Call C<new()> to create a new object.
my $lxs = Sys::Statistics::Linux::ProcStats->new;
Maybe you want to store/load the initial statistics to/from a file:
my $lxs = Sys::Statistics::Linux::ProcStats->new(initfile => '/tmp/procstats.yml');
If you set C<initfile> it's not necessary to call sleep before C<get()>.
It's also possible to set the path to the proc filesystem.
Sys::Statistics::Linux::ProcStats->new(
files => {
# This is the default
path => '/proc',
loadavg => 'loadavg',
stat => 'stat',
}
);
=head2 init()
Call C<init()> to initialize the statistics.
$lxs->init;
=head2 get()
Call C<get()> to get the statistics. C<get()> returns the statistics as a hash reference.
my $stat = $lxs->get;
=head2 raw()
Get raw values.
=head1 EXPORTS
No exports.
=head1 SEE ALSO
B<proc(5)>
=head1 REPORTING BUGS
Please report all bugs to <jschulz.cpan(at)bloonix.de>.
=head1 AUTHOR
Jonny Schulz <jschulz.cpan(at)bloonix.de>.
=head1 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.
=cut
package Sys::Statistics::Linux::ProcStats;
use strict;
use warnings;
use Carp qw(croak);
use Time::HiRes;
our $VERSION = '0.20';
sub new {
my $class = shift;
my $opts = ref($_[0]) ? shift : {@_};
my %self = (
files => {
path => '/proc',
loadavg => 'loadavg',
stat => 'stat',
}
);
if (defined $opts->{initfile}) {
require YAML::Syck;
$self{initfile} = $opts->{initfile};
}
foreach my $file (keys %{ $opts->{files} }) {
$self{files}{$file} = $opts->{files}->{$file};
}
return bless \%self, $class;
}
sub init {
my $self = shift;
if ($self->{initfile} && -r $self->{initfile}) {
$self->{init} = YAML::Syck::LoadFile($self->{initfile});
$self->{time} = delete $self->{init}->{time};
} else {
$self->{time} = Time::HiRes::gettimeofday();
$self->{init} = $self->_load;
}
}
sub get {
my $self = shift;
my $class = ref $self;
if (!exists $self->{init}) {
croak "$class: there are no initial statistics defined";
}
$self->{stats} = $self->_load;
$self->_deltas;
if ($self->{initfile}) {
$self->{init}->{time} = $self->{time};
YAML::Syck::DumpFile($self->{initfile}, $self->{init});
}
return $self->{stats};
}
sub raw {
my $self = shift;
my $stat = $self->_load;
return $stat;
}
#
# private stuff
#
sub _load {
my $self = shift;
my $class = ref $self;
my $file = $self->{files};
my $lavg = $self->_procs;
my $filename = $file->{path} ? "$file->{path}/$file->{loadavg}" : $file->{loadavg};
open my $fh, '<', $filename or croak "$class: unable to open $filename ($!)";
($lavg->{runqueue}, $lavg->{count}) = (split m@/@, (split /\s+/, <$fh>)[3]);
close($fh);
return $lavg;
}
sub _procs {
my $self = shift;
my $class = ref $self;
my $file = $self->{files};
my %stat = ();
my $filename = $file->{path} ? "$file->{path}/$file->{stat}" : $file->{stat};
open my $fh, '<', $filename or croak "$class: unable to open $filename ($!)";
while (my $line = <$fh>) {
if ($line =~ /^processes\s+(\d+)/) {
$stat{new} = $1;
} elsif ($line =~ /^procs_(blocked|running)\s+(\d+)/) {
$stat{$1} = $2;
}
}
close($fh);
return \%stat;
}
sub _deltas {
my $self = shift;
my $class = ref $self;
my $istat = $self->{init};
my $lstat = $self->{stats};
my $time = Time::HiRes::gettimeofday();
my $delta = sprintf('%.2f', $time - $self->{time});
$self->{time} = $time;
if (!defined $istat->{new} || !defined $lstat->{new}) {
croak "$class: not defined key found 'new'";
}
if ($istat->{new} !~ /^\d+\z/ || $lstat->{new} !~ /^\d+\z/) {
croak "$class: invalid value for key 'new'";
}
my $new_init = $lstat->{new};
if ($lstat->{new} == $istat->{new} || $istat->{new} > $lstat->{new}) {
$lstat->{new} = sprintf('%.2f', 0);
} elsif ($delta > 0) {
$lstat->{new} = sprintf('%.2f', ($new_init - $istat->{new}) / $delta );
} else {
$lstat->{new} = sprintf('%.2f', $new_init - $istat->{new});
}
$istat->{new} = $new_init;
}
1;
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