Ben Browning created JRUBY-6456:
-----------------------------------
Summary: ThreadLocal Leak in 1.9 Mode w/ Internal Recursive Map
Key: JRUBY-6456
URL: https://jira.codehaus.org/browse/JRUBY-6456
Project: JRuby
Issue Type: Bug
Affects Versions: JRuby 1.6.6
Reporter: Ben Browning
Assignee: Thomas E Enebo
Fix For: JRuby 1.6.7
Anything that triggers the recursiveListAccess method of org.jruby.Ruby to get
called (Array.hash, Array.join, others in 1.9 mode) leaks ThreadLocal
variables. The amount of memory leaked is based on the number of threads
triggering this method per runtime and the number of different method names
.hash, .join, etc get called inside of.
A simple program to illustrate:
{code:title=thread_local_leak.rb|borderStyle=solid}
require 'java'
COUNT = 100
class ThreadLocalLeak < Array
COUNT.times do |i|
define_method("hash_#{i}") do
hash
end
end
end
leaker = ThreadLocalLeak.new([5, 10, 15])
COUNT.times { |i| leaker.send("hash_#{i}") }
recursiveField = JRuby.runtime.java_class.declared_field("recursive")
recursiveField.accessible = true
size = recursiveField.value(JRuby.runtime).get.size
puts "COUNT = #{COUNT}, recursive field size = #{size}"
{code}
{code:title=output|borderStyle=solid}
bbrowning@bbrowning-mbp:~/tmp$ jruby -v
jruby 1.6.6 (ruby-1.8.7-p357) (2012-01-30 5673572) (Java HotSpot(TM) 64-Bit
Server VM 1.6.0_29) [darwin-x86_64-java]
bbrowning@bbrowning-mbp:~/tmp$ jruby --1.9 thread_local_leak.rb
COUNT = 100, recursive field size = 100
{code}
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