Class: SwapUsage

Inherits:
Object
  • Object
show all
Defined in:
lib/swapus.rb

Overview

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ SwapUsage

Returns a new instance of SwapUsage.



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# File 'lib/swapus.rb', line 20

def initialize(options)
  @processes = {}
  @reverse   = options[:reverse]
  @number    = options[:number]
end

Instance Method Details

#get_processes ⇒ Object 



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# File 'lib/swapus.rb', line 26

def get_processes
  Dir['/proc/[0-9]*'].map do |pid_dir|
    pid  = File.basename(pid_dir).to_i
    cmd  = File.read("#{pid_dir}/cmdline").tr("\x00", ' ').strip
    swap = File.read("#{pid_dir}/status")[/^VmSwap:\s+([0-9]+)\s+kB$/, 1].to_i

    @processes[pid] = { cmd: cmd, swap: swap } if swap.positive?
  end
end

#run ⇒ Object 



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# File 'lib/swapus.rb', line 46

def run
  get_processes
  show
end

#show ⇒ Object 



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# File 'lib/swapus.rb', line 36

def show
  @processes = @processes.sort_by { |_, v| v[:swap] }
  @processes = @processes.reverse if @reverse
  @processes = @processes.first(@number) if @number

  @processes.each do |pid, values|
    puts "#{values[:swap]} kB [#{pid}] #{values[:cmd]}"
  end
end