1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
#!/usr/bin/perl
# cpuload.pl 2010 (c) Paul Buetow
use strict;
use warnings;
use IPC::Open2;
use Data::Dumper;
use threads;
use threads::shared;
$| = 1;
my %GLOBAL_STATS :shared;
my %GLOBAL_CONF :shared;
%GLOBAL_CONF = (
'sleep' => 1,
size => 10,
events => 20,
);
sub say (@) {
print "$_\n" for @_;
return undef;
}
sub reduce (&@) {
my ($func, @params) = @_;
my $sub;
$sub = sub {
my ($elem, @rest) = @_;
$func->($elem, @rest == 1 ? $rest[0] : $sub->(@rest));
};
return $sub->($func, @params);
}
sub sum (@) { reduce { $_[0] + $_[1] } @_ }
sub loop (&) { $_[0]->() while 1 }
sub parse_cpu_line ($) {
my %load;
@load{qw(name user nice system iowait irq softirq)} = split ' ', shift;
$load{TOTAL} = sum @load{qw(user)};
return ($load{name}, \%load);
}
sub get_local_stat () {
open my $fh, '/proc/stat' or die "$!: /proc/stat\n";
my @stat = <$fh>;
close $fh;
return @stat;
}
sub get_remote_stat ($) {
my $host = shift;
loop {
my $sleep = $GLOBAL_CONF{sleep};
my $events = $GLOBAL_CONF{events};
my $pid = open2 my $out, my $in, qq{
ssh $host 'for i in \$(seq $events); do cat /proc/stat; sleep $sleep; done'
} or die "Error: $!\n";
$SIG{STOP} = sub {
say "Shutting down get_remote_stat($host) & $pid";
kill 1, $pid;
threads->exit();
};
while (<$out>) {
/^cpu/ && do {
my ($name, $val) = parse_cpu_line $_;
$GLOBAL_STATS{"$host;$name"} = $val->{TOTAL};
}
}
}
}
sub display_stats () {
$SIG{STOP} = sub {
say "Shutting down display_stats";
threads->exit();
};
my $size = $GLOBAL_CONF{size};
my $print_header = sub {
sleep $GLOBAL_CONF{sleep} until %GLOBAL_STATS;
my (@header) = ('', '');
for my $key (sort keys %GLOBAL_STATS) {
my ($host, $name) = split ';', $key;
$header[0] .= sprintf "%${size}s ", $host;
$header[1] .= sprintf "%${size}s ", $name;
}
say @header;
};
$print_header->();
my $header_counter = 0;
loop {
unless (++$header_counter % 10) {
$header_counter = 0;
$print_header->();
}
my $line = '';
$line .= sprintf "%${size}d", $GLOBAL_STATS{$_} for sort keys %GLOBAL_STATS;
say $line;
sleep $GLOBAL_CONF{sleep};
}
}
sub main () {
my @threads;
push @threads, threads->create('get_remote_stat', 'localhost');
push @threads, threads->create('display_stats');
while (<STDIN>) {
/^q/ && last;
/^s/ && do {
$GLOBAL_CONF{sleep} = <STDIN>;
};
}
for (@threads) {
$_->kill('STOP');
$_->join();
}
say "Good bye";
exit 0;
}
main;
|
