Module: Pgmonitor::PS

Extended by:
PS
Included in:
PS
Defined in:
lib/pgmonitor/ps.rb

Constant Summary collapse

@@last_renice = 
Time.now

Instance Method Summary collapse

Instance Method Details

#add_cummulative_data(cdata) ⇒ Object 



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# File 'lib/pgmonitor/ps.rb', line 101

def add_cummulative_data(cdata)
  cdata.each do |database, data|
    ::Pgmonitor::UsageData.add(database, data)
  end
  ::Pgmonitor::UsageData.clean
end

#command_to_data(command) ⇒ Object 



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# File 'lib/pgmonitor/ps.rb', line 148

def command_to_data(command)
  regex = /^postgres: ([\w\d]+) ([\w\d]+) ((:?\d{1,3}\.){3}(?:\d{1,3}))\((\d+)\)/
  if m = regex.match(command)
    { 'database' => m[1], 'ip' => m[3], 'port' => m[4] }
  end
end

#cummulate_data(data, timeslice) ⇒ Object 



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# File 'lib/pgmonitor/ps.rb', line 108

def cummulate_data(data, timeslice)
  databases = {}
  data.each do |d|
    db = d['database']
    databases[db] ||= {
      'pids' => [],
      'cpu' => 0,
      'mem' => 0,
      'connections' => 0,
      'sources' => [],
      'timeslice' => timeslice,
    }

    databases[db]['pids'] << d['pid']
    databases[db]['cpu'] += d['cpu'].to_i
    databases[db]['mem'] += d['mem'].to_i
    databases[db]['connections'] += 1
    databases[db]['sources'] << "#{d['ip']}:#{d['port']}"
  end
  databases
end

#line_to_data(line) ⇒ Object 



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# File 'lib/pgmonitor/ps.rb', line 130

def line_to_data(line)
  tokens = line.split(/\s+/)

  pdata = { }
  pdata['user'] = tokens.shift
  pdata['pid']  = tokens.shift
  pdata['nice'] = tokens.shift
  pdata['cpu']  = tokens.shift
  pdata['mem']  = tokens.shift
  command = tokens.join(' ')

  data = command_to_data(command)
  return unless data

  data.merge!(pdata)
  data
end

#log(level, *args) ⇒ Object 



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# File 'lib/pgmonitor/ps.rb', line 8

def log(level, *args)
  if level == :debug
    $stderr.puts(*args) if ::Pgmonitor.debug?
  else
    if level == :error
      $stderr.puts(*args)
    else
      $stdout.puts(*args)
    end
  end
end

#need_to_renice? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pgmonitor/ps.rb', line 33

def need_to_renice?
  @@last_renice < Time.now - 60
end

#processes(&blk) ⇒ Object 



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# File 'lib/pgmonitor/ps.rb', line 20

def processes(&blk)
  ::EM.system("ps h -u postgres -o user,pid,ni,cp,rss,command") do |output, status|
    data = []
    output.split("\n").each do |line|
      d = line_to_data(line)
      data << d if d
    end
    blk.call(data)
  end
end

#queue ⇒ Object 



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# File 'lib/pgmonitor/ps.rb', line 84

def queue
  EM.add_timer(::Pgmonitor.delay) { ::Pgmonitor::PS.run }
end

#renice(&blk) ⇒ Object 



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# File 'lib/pgmonitor/ps.rb', line 37

def renice(&blk)
  unless need_to_renice?
    blk.call if blk
    return
  end

  databases = ::Pgmonitor::UsageData.avg
  databases.delete('postgres')
  databases.each do |db, d|
    if d['cpu'] > 200
      d['nice'] = 19
    elsif d['cpu'] > 100
      d['nice'] = 15
    else
      d['nice'] = 5
    end

    # if the number of connections is "high"
    # you're probably stressing the machine just by
    # having open connections
    if d['connections'] > 20 && d['nice'] < 15
      d['nice'] = 15
    end
  end

  databases.each do |db, d|
    log(:notice, "usage db_name='#{db}' cpu=#{d['cpu']} mem=#{d['mem']} nice=#{d['nice']} elapsed=#{d['elapsed_time']} connections=#{d['connections']}#{::Pgmonitor.log_items}")
  end

  processes do |psdata|
    @@last_renice = Time.now
    psdata.each do |ps|
      db = ps['database']
      next unless databases.has_key?(db)
      nice = databases[db]['nice']
      next if nice == ps['nice'].to_i

      log(:debug, "renicing db_name='#{db}' pid=#{ps['pid']} from=#{ps['nice']} to=#{nice}")
      `renice #{nice} -p #{ps['pid']} > /dev/null 2>&1`
    end

    renice_writer_process

    EM.next_tick(&blk) if blk
  end
end

#renice_writer_process ⇒ Object 



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# File 'lib/pgmonitor/ps.rb', line 155

def renice_writer_process
  `ps aux | grep 'postgres: writer process' | awk '{print $2}' | xargs renice 4 -p > /dev/null 2>&1`
  `ps aux | grep 'postgres: wal writer process' | awk '{print $2}' | xargs renice 4 -p > /dev/null 2>&1`
end

#run ⇒ Object 



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# File 'lib/pgmonitor/ps.rb', line 88

def run
  processes do |data|
    ::Pgmonitor::PS.scrape(data) { renice { ::Pgmonitor::PS.queue } }
  end
end

#scrape(data, &blk) ⇒ Object 



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# File 'lib/pgmonitor/ps.rb', line 94

def scrape(data, &blk)
  t1 = Time.now
  cdata = cummulate_data(data, t1)
  add_cummulative_data(cdata)
  blk.call
end