Module: SystemInspector::Linux

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

Class Method Summary collapse

Class Method Details

.cpu ⇒ Object 



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# 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 



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

def self.cpu_file
  "/proc/stat"
end

.disk_file ⇒ Object 



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

def self.disk_file
  "/proc/diskstats"
end

.disk_io ⇒ Object 



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# File 'lib/instrumental_tools/system_inspector/linux.rb', line 143

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.realpath(device) }
  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 



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# File 'lib/instrumental_tools/system_inspector/linux.rb', line 121

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 



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# File 'lib/instrumental_tools/system_inspector/linux.rb', line 174

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 



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# 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 



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# File 'lib/instrumental_tools/system_inspector/linux.rb', line 110

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 



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

def self.load_file
  "/proc/loadavg"
end

.load_filesystem ⇒ Object 



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# File 'lib/instrumental_tools/system_inspector/linux.rb', line 166

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

.load_memory ⇒ Object 



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# 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 



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# 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 



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# 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

  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 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 



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

def self.memory_file
  "/proc/meminfo"
end

.mount_file ⇒ Object 



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

def self.mount_file
  "/proc/mounts"
end

.open_files_file ⇒ Object 



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

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