Class: Solanum::Source::Memory

Inherits:
Solanum::Source show all
Defined in:
lib/solanum/source/memory.rb

Instance Attribute Summary collapse

Attributes inherited from Solanum::Source

#attributes, #period, #type

Instance Method Summary collapse

Methods inherited from Solanum::Source

#next_run

Constructor Details

#initialize(opts) ⇒ Memory

Returns a new instance of Memory.



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# File 'lib/solanum/source/memory.rb', line 8

def initialize(opts)
  super(opts)
  @thresholds = opts['thresholds'] || {}
  @swap_thresholds = opts['swap_thresholds'] || {}
end

Instance Attribute Details

#swap_thresholds ⇒ Object (readonly)

Returns the value of attribute swap_thresholds.



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# File 'lib/solanum/source/memory.rb', line 5

def swap_thresholds
  @swap_thresholds
end

#thresholds ⇒ Object (readonly)

Returns the value of attribute thresholds.



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# File 'lib/solanum/source/memory.rb', line 5

def thresholds
  @thresholds
end

Instance Method Details

#collect! ⇒ Object 



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# File 'lib/solanum/source/memory.rb', line 15

def collect!
  events = []

  meminfo = Hash.new(0)
  File.readlines('/proc/meminfo').each do |line|
    measure, quantity = *line.chomp.split(/: +/)
    value, unit = *quantity.split(' ')
    meminfo[measure] = value.to_i
  end

  mem_total = meminfo['MemTotal'].to_f
  record_usage = lambda do |type|
    if meminfo[type]
      usage_pct = meminfo[type]/mem_total.to_f
      events << {
        service: "memory #{type.downcase}",
        metric: usage_pct,
      }
    end
  end

  total_used = mem_total - meminfo['MemFree']
  mem_used = total_used - meminfo['Buffers'] - meminfo['Cached']
  usage = mem_used/mem_total
  events << {
    service: 'memory usage',
    metric: usage,
    state: state_over(@thresholds, usage),
  }

  events << {
    service: 'memory buffers',
    metric: meminfo['Buffers']/mem_total
  }

  cached = meminfo['Cached'] + meminfo['SReclaimable'] - meminfo['Shmem']
  events << {
    service: 'memory cached',
    metric: cached/mem_total
  }

  if meminfo['SwapTotal'] && meminfo['SwapTotal'] > 0
    swap_total = meminfo['SwapTotal']
    swap_free = meminfo['SwapFree']
    usage = 1.0 - swap_free/swap_total.to_f
    events << {
      service: 'swap usage',
      metric: usage,
      state: state_over(@swap_thresholds, usage),
    }
  end

  events
end