2014-01-16 22:10:00 +01:00
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#!/usr/bin/perl
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#
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# $NetBSD: netbsd_memory.pl,v 1.2 2014/01/16 21:10:00 tron Exp $
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#
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# Copyright (c) 2014 The NetBSD Foundation, Inc.
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# All rights reserved.
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#
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# This code is derived from software contributed to The NetBSD Foundation
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# by Matthias Scheler.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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use warnings;
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use strict;
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use POSIX;
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# Use vmstat(1) to get memory usage information. "vmstat -s" produces
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# output lines like these:
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#
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# 2034763 pages managed
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# 28953 pages free
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#
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# This function creates a hash using the description as a key to the value.
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sub get_vm_stats()
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{
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my %vm_stats;
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my $vmstat_fh;
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if (!open($vmstat_fh, '-|', '/usr/bin/vmstat -s')) {
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die('Cannot start vmstat.');
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}
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while (my $line = <$vmstat_fh>) {
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$line =~ s/^\s+//;
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$line =~ s/\s+$//;
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my @words = split(/\s+/, $line, 2);
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if (scalar(@words) < 2) {
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next;
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}
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my ($value, $descr) = @words;
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$vm_stats{$descr} = $value;
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}
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close($vmstat_fh);
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return %vm_stats;
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}
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if (scalar(@ARGV) < 1) {
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die('Please provide a field name');
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}
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my $page_size = POSIX::sysconf(&POSIX::_SC_PAGESIZE);
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my %vm_stats = get_vm_stats();
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# Calculate metrics using the stats reported by vmstat(1).
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# Cacti only uses "MemFree" and "SwapFree" at the moment.
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my $value = 0;
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if ($ARGV[0] =~ 'MemTotal') {
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$value = $vm_stats{'pages managed'};
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} elsif ($ARGV[0] =~ 'MemFree') {
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$value = $vm_stats{'pages free'};
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} elsif ($ARGV[0] =~ 'Buffers') {
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$value = $vm_stats{'cached file pages'};
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} elsif ($ARGV[0] =~ 'Cached') {
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$value = $vm_stats{'anonymous pages'} +
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$vm_stats{'cached file pages'} +
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$vm_stats{'cached executable pages'};
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} elsif ($ARGV[0] =~ 'SwapTotal') {
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$value = $vm_stats{'swap pages'};
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} elsif ($ARGV[0] =~ 'SwapFree') {
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$value = $vm_stats{'swap pages'} -
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$vm_stats{'swap pages in use'};
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}
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print $value * ($page_size / 1024);
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exit(0);
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