From: Tal Yalon <tal.yalon@...>
Date: 2011-02-09T00:07:10+09:00
Subject: Memory leak in 1.9.2-p330?

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Hi all,

Before I go and submit a bug report, I would appreciate a fresh pair of eyes
hopefully finding a bug in the code and not in Ruby :)

The code pushes elements to a "time window" queue of 2 seconds. Although I
see that the maximum queue size stabilizes after a very short time (couple
of seconds), the process's max RSS size starts to grow after a while 2
minutes.
Interestingly enough, the max RSS size stays fixed when running with 1.8.7.
All tests were done on Ruby compiled using rvm.

Printing the process's RSS and max RSS size was done to observe the leak in
action, This code also leaks when removing the lines that execute ps and
print it.

Any idea will be welcomed.

Thanks,
Tal

#!/usr/bin/env ruby

before = Time.now.to_i
i = 0
max_rss = 0
max_items = 0

queue = []
while true
  now = Time.now.to_i
  windows_start_time = now - 2
  queue << now
  while not queue.empty? and queue[0] < windows_start_time
    queue.shift
  end

  if now - before >= 1
    max_items = [ max_items, queue.size ].max
    rss = `ps -o rss= -p #{Process.pid}`.to_i
    max_rss = [ max_rss, rss].max
    print("#{now} iters=#{i} queue_size=#{queue.size} rss=#{rss}, max:
queue_size=#{max_items}, rss=#{max_rss}\n")
    before = now
  end
  i += 1
end

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