From: from-ruby-lang@...
Date: 2015-07-02T15:48:18+00:00
Subject: [ruby-core:69845] [Ruby trunk - Bug #11174] threads memory leak

Issue #11174 has been updated by Cyril Vechera.

ruby -v changed from 2.2.0 to 2.2.3, 2.2.0, 2.1.0, 2.0.0, 1.9.3

I've checked the bug on older versions and the 2.2-head: leaks all but 1.8.7

~~~
$ ruby --version
ruby 2.2.3p139 (2015-07-01) [x86_64-linux]
$ ruby /tmp/thread_memleak4.rb
VmRSS:     47152 kB
VmRSS:     72872 kB
VmRSS:     90448 kB
VmRSS:    105752 kB

~~~

~~~
$ ruby --version
ruby 1.8.7 (2014-01-28 patchlevel 376) [x86_64-linux]
$ ruby /tmp/thread_memleak4.rb
VmRSS:      2496 kB
VmRSS:      3688 kB
VmRSS:      2768 kB
VmRSS:      2536 kB
VmRSS:      2536 kB

~~~

----------------------------------------
Bug #11174: threads memory leak
https://bugs.ruby-lang.org/issues/11174#change-53244

* Author: Cyril Vechera
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 2.2.3, 2.2.0, 2.1.0, 2.0.0, 1.9.3
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
There's strong memory growth during intensive thread using. 

Script to demonstrate the problem (on x86_64-linux):

~~~
loop {
	10.times { 1000.times.map { Thread.new { } }.each(&:join) }
	GC.start # not necessary, just to be sure
	puts File.open('/proc/self/status').grep(/VmRSS:/).first
}
~~~

Running this script shows RSS growing from 45 Mb at the start time to 700 Mb after few minutes.

~~~
$ ruby thread_memleak4.rb
VmRSS:     45036 kB
VmRSS:     66748 kB
VmRSS:     87024 kB
...
VmRSS:    678052 kB
~~~

---Files--------------------------------
thread_memleak4.rb (138 Bytes)


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