From: hartator@...
Date: 2018-09-14T09:17:58+00:00
Subject: [ruby-core:89004] [Ruby trunk Bug#11174] threads memory leak

Issue #11174 has been updated by hartator (Julien Khaleghy).


ko1 (Koichi Sasada) wrote:
> Sorry I missed it.

Thanks for the awesome work on MRI.

I still have the same issue on Ruby 2.5.1 (ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux-gnu]):

~~~ ruby
VmRSS:	   60116 kB
VmRSS:	   79448 kB
VmRSS:	   89768 kB
VmRSS:	   99276 kB
VmRSS:	  107916 kB
VmRSS:	  113728 kB
VmRSS:	  118736 kB
VmRSS:	  126600 kB
...
after 5 minutes
....
VmRSS:	  754552 kB
VmRSS:	  757876 kB
VmRSS:	  760132 kB
~~~


Any idea if it's already fixed somewhere else, or you guys still working on it?

----------------------------------------
Bug #11174: threads memory leak
https://bugs.ruby-lang.org/issues/11174#change-74032

* Author: cvss (Cyril Vechera)
* Status: Open
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
* Target version: 
* 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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