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God::Conditions::CpuUsage

Condition Symbol :cpu_usage Type: Poll

Trigger when the percent of CPU use of a process is above a specified limit. On multi-core systems, this number could conceivably be above 100.

Paramaters

Required
  +pid_file+ is the pid file of the process in question. Automatically
             populated for Watches.
  +above+ is the percent CPU above which to trigger the condition. You
          may use #percent to clarify this amount (see examples).

Examples

Trigger if the process is using more than 25 percent of the cpu (from a Watch):

on.condition(:cpu_usage) do |c|
  c.above = 25.percent
end

Non-Watch Tasks must specify a PID file:

on.condition(:cpu_usage) do |c|
  c.above = 25.percent
  c.pid_file = "/var/run/mongrel.3000.pid"
end

Attributes

above[RW]
pid_file[RW]
times[RW]

Public Class Methods

new() click to toggle source
# File lib/god/conditions/cpu_usage.rb, line 34
def initialize
  super
  self.above = nil
  self.times = [1, 1]
end

Public Instance Methods

pid() click to toggle source
# File lib/god/conditions/cpu_usage.rb, line 52
def pid
  self.pid_file ? File.read(self.pid_file).strip.to_i : self.watch.pid
end
prepare() click to toggle source
# File lib/god/conditions/cpu_usage.rb, line 40
def prepare
  if self.times.kind_of?(Integer)
    self.times = [self.times, self.times]
  end

  @timeline = Timeline.new(self.times[1])
end
reset() click to toggle source
# File lib/god/conditions/cpu_usage.rb, line 48
def reset
  @timeline.clear
end
test() click to toggle source
# File lib/god/conditions/cpu_usage.rb, line 63
def test
  process = System::Process.new(self.pid)
  @timeline.push(process.percent_cpu)
  self.info = []

  history = "[" + @timeline.map { |x| "#{x > self.above ? '*' : ''}#{x}%%" }.join(", ") + "]"

  if @timeline.select { |x| x > self.above }.size >= self.times.first
    self.info = "cpu out of bounds #{history}"
    return true
  else
    return false
  end
end
valid?() click to toggle source
# File lib/god/conditions/cpu_usage.rb, line 56
def valid?
  valid = true
  valid &= complain("Attribute 'pid_file' must be specified", self) if self.pid_file.nil? && self.watch.pid_file.nil?
  valid &= complain("Attribute 'above' must be specified", self) if self.above.nil?
  valid
end

[Validate]

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