gistfile1.txt

Running in ruby-42105
Duration: 6.152866841
sam      18719 88.0  0.7 226236 197432 pts/1   Sl+  22:46   0:06 ruby mem.rb

Running in ruby-42110
Duration: 5.485298626
sam      18728  110  1.3 351912 322304 pts/1   Sl+  22:46   0:05 ruby mem.rb

Running in ruby-42563
Duration: 5.216104843
sam      19509  104  1.3 351260 322404 pts/1   Sl+  22:54   0:05 ruby mem.rb

Running in ruby-42568
Duration: 5.388427669
sam      19518  108  1.0 288260 258576 pts/1   Sl+  22:54   0:05 ruby mem.rb


Running in ruby-42866
Duration: 5.67313438
sam      20248 94.6  1.0 290052 258860 pts/1   Sl+  22:59   0:05 ruby mem.rb

Running in ruby-42871
Duration: 6.087088135
sam      20257  101  0.8 234980 201416 pts/1   Sl+  23:00   0:06 ruby mem.rb

Running in ruby-43069
Duration: 5.81778172
sam      20584 97.0  0.8 229084 198420 pts/1   Sl+  23:03   0:05 ruby mem.rb

Running in ruby-43074
Duration: 5.724598436
sam      20594 95.6  1.1 325176 293444 pts/1   Sl+  23:03   0:05 ruby mem.rb

Running in ruby-43333
Duration: 5.417208553
sam      21044  108  1.2 341352 308652 pts/1   Sl+  23:08   0:05 ruby mem.rb

Running in ruby-43338
Duration: 5.634901383
sam      21053 94.1  1.0 282668 251036 pts/1   Sl+  23:08   0:05 ruby mem.rb

Running in ruby-43534
Duration: 6.259690269
sam      21382  104  0.9 262248 232516 pts/1   Sl+  23:12   0:06 ruby mem.rb

Running in ruby-43539
Duration: 5.740280076
sam      21391 95.8  1.1 318660 289292 pts/1   Sl+  23:12   0:05 ruby mem.rb

gistfile2.txt

@retained = []

MAX_STRING_SIZE = 100

def stress(allocate_count, retain_count, chunk_size)
  chunk = []
  while retain_count > 0 || allocate_count > 0
    if retain_count == 0 || (Random.rand < 0.5 && allocate_count > 0)
      chunk << " " * (Random.rand * MAX_STRING_SIZE).to_i
      allocate_count -= 1
      if chunk.length > chunk_size
        chunk = []
      end
    else
      @retained << " " * (Random.rand * MAX_STRING_SIZE).to_i
      retain_count -= 1
    end
  end
end

start = Time.now
stress(10_000_000, 600_000, 200_000)
puts "Duration: #{(Time.now - start).to_f}"

puts `ps aux | grep #{Process.pid} | grep -v grep`

gistfile3.txt

EG:

RSS in 42105 is 226mb

RSS in 42110 is 322mb

its the output of ps aux, so vsz first, rss second

This was a collection of interesting RSS consumed due to script in Ruby builds in the last year ... ran it on every 5 builds.

The script attempts to be a rough simulation of a rails web app.