Hi,

In message "Re: [ruby-core:23252] [Bug #1392] Object#extend leaks memory on Ruby 1.9.1"
    on Sun, 19 Apr 2009 07:18:18 +0900, Muhammad Ali <redmine / ruby-lang.org> writes:
|
|Bug #1392: Object#extend leaks memory on Ruby 1.9.1
|http://redmine.ruby-lang.org/issues/show/1392

|A few bytes are leaked every time Object#extend is called, here is a sample 1.9.1 script

It does not leak memory.  the version that use #extend allocates
internal class-like object for each hash object, so that it allocates
lot more objects than #include version, thus requires more heap space
to be allocated.  The GC does reclaim the unused objects, but it may
not be able to return heap space to the underlying OS.

To confirm there's no memory leak, replace sleep with

  GC.start
  p ObjectSpace.count_objects

It prints the number of live objects, e.g.

{:TOTAL=>17185, :FREE=>9590, :T_OBJECT=>5, :T_CLASS=>474, :T_MODULE=>20, :T_FLOAT=>6, :T_STRING=>1551, :T_REGEXP=>10, :T_ARRAY=>23, :T_HASH=>3, :T_BIGNUM=>2, :T_FILE=>3, :T_DATA=>28, :T_COMPLEX=>1, :T_NODE=>5451, :T_ICLASS=>18}

							matz.