Module: SystemInspector::Linux

Defined in:
lib/instrumental_tools/system_inspector/linux.rb

Class Method Summary collapse

Class Method Details

.cpu ⇒ Object 



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
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 34

def self.cpu
  agg_cpu_stat = File.read(cpu_file).lines.map { |line| line.split }.detect { |values| values.first == "cpu" }
  output       = {}

  if agg_cpu_stat
    categories = [:user, :nice, :system, :idle, :iowait]
    values     = agg_cpu_stat.slice(1, 5).map { |v| v.to_f }
    SystemInspector.memory.store(:cpu_values, values.dup)
    if previous_values = SystemInspector.memory.retrieve(:cpu_values)
      index = -1
      values.collect! { |value| (previous_values[index += 1] - value).abs }
    end

    data   = Hash[*categories.zip(values).flatten]
    total  = values.inject { |memo, value| memo + value }

    if previous_values
      data.each do |category, value|
        output["cpu.#{category}"] = value / total * 100
      end
    end

    output["cpu.in_use"] = 100 - data[:idle] / total * 100
  end

  output
end

.cpu_file ⇒ Object 



10
11
12
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 10

def self.cpu_file
  "/proc/stat"
end

.disk_file ⇒ Object 



18
19
20
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 18

def self.disk_file
  "/proc/diskstats"
end

.disk_io ⇒ Object 



149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 149

def self.disk_io
  output          = {}
  device_root     = "/dev/"
  mounted_devices = File.read(mount_file).lines.map { |l| l.split.first }.select { |device| device.index(device_root) }.map { |device| File.exists?(device) ? File.realpath(device) : nil }.compact
  diskstats_lines = File.read(disk_file).lines.map(&:split).select { |values| mounted_devices.include?(File.join(device_root, values[2])) }
  entries         = diskstats_lines.map do |values|
                      entry               = {}
                      entry[:time]        = Time.now
                      entry[:device]      = values[2]
                      entry[:utilization] = values[12].to_f
                      SystemInspector.memory.store("disk_stats_#{entry[:device]}".to_sym, entry)
                    end

  entries.each do |entry|
    if previous_entry = SystemInspector.memory.retrieve("disk_stats_#{entry[:device]}".to_sym)
      time_delta                                           = (entry[:time] - previous_entry[:time]) * 1000
      utilization_delta                                    = entry[:utilization] - previous_entry[:utilization]
      output["disk.#{entry[:device]}.percent_utilization"] = utilization_delta / time_delta * 100
    end
  end
  output
end

.disk_storage ⇒ Object 



127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 127

def self.disk_storage
  output = {}
  `df -Pka`.lines.each do |line|
    device, total, used, available, capacity, mount = line.chomp.split
    if device == "tmpfs"
      names = ["tmpfs_#{mount.gsub(/[^[:alnum:]]/, "_")}".gsub(/_+/, "_")]
    elsif device =~ %r{/dev/}
      names = [File.basename(device)]
    else
      next
    end
    names << 'root' if mount == '/'
    names.each do |name|
      output["disk.#{name}.total_mb"]          = total.to_f / 1024
      output["disk.#{name}.used_mb"]           = used.to_f / 1024
      output["disk.#{name}.available_mb"]      = available.to_f / 1024
      output["disk.#{name}.available_percent"] = available.to_f / total.to_f * 100
    end
  end
  output
end

.filesystem ⇒ Object 



180
181
182
183
184
185
186
187
188
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 180

def self.filesystem
  allocated, unused, max = File.read(open_files_file).split.map(&:to_i)
  open_files             = allocated - unused
  {
    'filesystem.open_files'         => open_files,
    'filesystem.max_open_files'     => max,
    'filesystem.open_files_pct_max' => (open_files.to_f / max.to_f) * 100
  }
end

.load_cpu ⇒ Object 



3
4
5
6
7
8
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 3

def self.load_cpu
  output = { :gauges => {} }
  output[:gauges].merge!(cpu)
  output[:gauges].merge!(loadavg)
  output
end

.load_disks ⇒ Object 



116
117
118
119
120
121
122
123
124
125
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 116

def self.load_disks
  output = { :gauges => {} }
  if SystemInspector.command_present?('df', 'disk storage')
    output[:gauges].merge!(disk_storage)
  end
  if File.exists?(mount_file) && File.exists?(disk_file)
    output[:gauges].merge!(disk_io)
  end
  output
end

.load_file ⇒ Object 



14
15
16
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 14

def self.load_file
  "/proc/loadavg"
end

.load_filesystem ⇒ Object 



172
173
174
175
176
177
178
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 172

def self.load_filesystem
  output = { :gauges => {} }
  if File.exists?(open_files_file)
    output[:gauges].merge!(filesystem)
  end
  output
end

.load_memory ⇒ Object 



71
72
73
74
75
76
77
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 71

def self.load_memory
  output = { :gauges => {} }
  if File.exists?(memory_file)
    output[:gauges].merge!(memory)
  end
  output
end

.loadavg ⇒ Object 



62
63
64
65
66
67
68
69
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 62

def self.loadavg
  min_1, min_5, min_15 = File.read(load_file).split
  {
    'load.1min'  => min_1.to_f,
    'load.5min'  => min_5.to_f,
    'load.15min' => min_15.to_f
  }
end

.memory ⇒ Object 



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
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 79

def self.memory
  memory_stats = Hash[File.read(memory_file).lines.map { |line| line.chomp.strip.split(/:\s+/) }.reject { |l| l.size != 2 } ]
  total        = memory_stats["MemTotal"].to_f
  free         = memory_stats["MemFree"].to_f
  used         = total - free
  buffers      = memory_stats["Buffers"].to_f
  cached       = memory_stats["Cached"].to_f
  swaptotal    = memory_stats["SwapTotal"].to_f
  swapfree     = memory_stats["SwapFree"].to_f
  swapused     = swaptotal - swapfree
  available    = memory_stats["MemAvailable"].to_f if memory_stats["MemAvailable"]

  stats_to_record = {
    'memory.used_mb'      => used / 1024,
    'memory.free_mb'      => free / 1024,
    'memory.buffers_mb'   => buffers / 1024,
    'memory.cached_mb'    => cached / 1024,
    'memory.free_percent' => (free / total) * 100,

  }

  if available
    stats_to_record['memory.available_mb']      = available / 1024
    stats_to_record['memory.available_percent'] = (available / total) * 100
  end

  if swaptotal > 0
    stats_to_record.merge!({
                             'swap.used_mb'        => swapused / 1024,
                             'swap.free_mb'        => swapfree / 1024,
                             'swap.free_percent'   => (swapfree / swaptotal) * 100
                           })
  end

  stats_to_record
end

.memory_file ⇒ Object 



30
31
32
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 30

def self.memory_file
  "/proc/meminfo"
end

.mount_file ⇒ Object 



22
23
24
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 22

def self.mount_file
  "/proc/mounts"
end

.open_files_file ⇒ Object 



26
27
28
 
# File 'lib/instrumental_tools/system_inspector/linux.rb', line 26

def self.open_files_file
  "/proc/sys/fs/file-nr"
end