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Backport #10559 ยป mem.rb

niels_tolstrup (Niels Tolstrup), 12/01/2014 02:28 PM

 
#!/usr/local/ruby-2.1.3/bin/ruby


#### methods ####

def time_step( n)
while Time.new - $start_time < n
sleep( 0.1)
end
end


def memory_object( size)
result = []
count = size/20
count.times do
result << "%20.18f" % rand
end
return result
end


def memory_log( message)
shared_memory = 0
private_memory = 0
lines = File.read( "/proc/#{$$}/smaps")
lines.scan( /.+?Shared_Dirty:\s+(\d+).+?Private_Dirty:\s+(\d+)/m) do |shared_dirty,private_dirty|
shared_memory += shared_dirty.to_i
private_memory += private_dirty.to_i
end
time = Time.new - $start_time
puts "%6.3fs %5d %-15s %10d %10d" % [time, $$, message, shared_memory/1000, private_memory/1000]
end


##### main #####


puts "ruby version #{RUBY_VERSION}"

GC.disable

puts " %6s %5s %-15s %10s %10s" % ["time", "pid", "message", "shared", "private"]

big_memory = memory_object( 10_000_000)

$start_time = Time.new

pid = fork do
time_step( 4)
memory_log( "Child pre GC")

time_step( 6)
GC.enable; GC.start; GC.disable

time_step( 8)
memory_log( "Child post GC")

STDOUT.flush
exit!
end

time_step( 4)
memory_log( "Parent pre GC ")

time_step( 8)
memory_log( "Parent post GC")

Process.wait( pid)
    (1-1/1)