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lagsalot/free-memory.rb

Forked from vigo/free-memory.rb
Last active December 21, 2015 15:58
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free-memory.rb
#!/usr/bin/env ruby
# encoding: utf-8
# By Uğur Özyılmazel, @vigobronx | @ugurozyilmazel
# http://vigodome.com | http://ugur.ozyilmazel.com | https://github.com/vigo
def get_paged_memory_usage(match_string, paging=4096)
mvar = 3
if match_string.split(/[^\w]/).length > 1
mvar = 4
end
paged_val = `vm_stat | grep "Pages #{match_string}:" | awk '{ print $#{mvar}}'`.to_i
gigabyte_val = (paged_val * paging) / 1024 / 1024 / 1000.0
end
installed_memory = `sysctl -n hw.memsize`.to_i / 1024 / 1024 / 1000.0
total_consumed = 0
['wired down', 'active', 'inactive'].each { |key| total_consumed += get_paged_memory_usage(key) }
puts printf("%.2fG", (installed_memory-total_consumed)) # returns in gigabytes
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