Last active
September 28, 2021 13:02
-
-
Save trevor-vaughan/485749336a0343d57a6b64627b71a240 to your computer and use it in GitHub Desktop.
Get application and stack size in a form useful for using with pam_limits
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/usr/bin/ruby | |
# Get application and stack size in a form useful for using with pam_limits | |
require 'json' | |
PAGE_SIZE = %x(getconf PAGESIZE).to_i | |
UID = Process.uid | |
mem_info = Hash.new | |
max_stack_entry = nil | |
max_stack_size = 0.0 | |
max_address_entry = nil | |
max_address_size = 0.0 | |
Dir.glob('/proc/*').each do |dir| | |
pid = File.basename(dir) | |
next unless pid =~ /^\d+$/ | |
next unless File.directory?(dir) | |
unless UID == 0 | |
next unless UID == File.stat("#{dir}/maps").uid | |
end | |
command = %x(cat #{dir}/comm).strip | |
mapfile = %x(cat #{dir}/maps) | |
address_size = (%x(ps -ho sz #{pid}).strip.to_i * PAGE_SIZE) | |
stack_size = 0.0 | |
mapfile.each_line do |map| | |
info = map.split(/\s+/) | |
mem_start, mem_end = info.first.split('-').map{|x| x.to_i(16)} | |
mem_size = mem_end - mem_start | |
path = info.last | |
if path =~ /\[stack/ | |
stack_size += mem_size | |
end | |
end | |
mem_info[command] ||= Hash.new | |
mem_info[command][pid] = { | |
:address_size => { | |
:b => address_size, | |
:kb => address_size/1024, | |
:mb => address_size/(1024**2), | |
:gb => address_size/(1024**3) | |
}, | |
:stack_size => { | |
:b => stack_size, | |
:kb => stack_size/1024, | |
:mb => stack_size/(1024**2), | |
:gb => stack_size/(1024**3) | |
} | |
} | |
if address_size >= max_address_size | |
max_address_size = address_size | |
max_address_entry = { | |
command => mem_info[command] | |
} | |
end | |
if stack_size >= max_stack_size | |
max_stack_size = stack_size | |
max_stack_entry = { | |
command => mem_info[command] | |
} | |
end | |
end | |
#puts JSON.pretty_generate(mem_info) | |
puts 'Largest App: ' | |
puts JSON.pretty_generate(max_address_entry) | |
puts 'Largest Stack: ' | |
puts JSON.pretty_generate(max_stack_entry) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment