From: Robert Klemme <shortcutter@...>
Date: 2010-05-21T18:51:26+09:00
Subject: Re: OMG, why are there so many Strings in ObjectSpace!

2010/5/21 timr <timrandg@gmail.com>:
> I was playing around looking at ObjectSpace in irb and was astounded
> at how many string objects there are. Why are there 57,000+ String
> objects?!?

It would be interesting to know what code you executed *before* you
created your stats.  Note that this includes any libraries required
and files loaded.

Another question is: is there a problem?  Is your program slow or
running out of memory?  If not, why care?  Eventually all these
objects will be GC'ed - unless you have a leak of course.

Btw:

11:47:36 Temp$ cat c.rb
cnt = Hash.new 0

ObjectSpace.each_object(Object) do |o|
  cnt[o.class] += 1
end

cnt.sort_by {|k,v| -v}.each do |cl,count|
  printf "%6d %s\n", count, cl
end
11:49:54 Temp$ allruby c.rb
CYGWIN_NT-5.1 padrklemme1 1.7.5(0.225/5/3) 2010-04-12 19:07 i686 Cygwin
========================================
ruby 1.8.7 (2008-08-11 patchlevel 72) [i386-cygwin]
   179 Class
   167 String
    16 Module
     6 Array
     5 Float
     3 Object
     3 IO
     1 File
     1 Binding
     1 Hash
     1 SystemStackError
     1 NoMemoryError
     1 Bignum
     1 fatal
     1 ThreadGroup
     1 Thread
========================================
ruby 1.9.1p378 (2010-01-10 revision 26273) [i386-cygwin]
  1659 String
   201 Class
    83 Encoding
    48 RubyVM::InstructionSequence
    18 Module
    14 Array
    10 Hash
    10 Regexp
     5 Bignum
     5 Float
     3 IO
     2 Object
     2 RubyVM::Env
     1 Binding
     1 ThreadGroup
     1 Thread
     1 RubyVM
     1 NoMemoryError
     1 Complex
     1 SystemStackError
     1 ARGF.class
     1 Mutex
     1 Data
     1 File
     1 fatal
========================================
jruby 1.4.0 (ruby 1.8.7 patchlevel 174) (2009-11-02 69fbfa3) (Java
HotSpot(TM) Client VM 1.6.0_20) [x86-java]
c.rb:5:in `each_object': ObjectSpace is disabled; each_object will
only work with Class, pass -X+O to enable (RuntimeError)
        from c.rb:5
11:50:10 Temp$

Cheers

robert


-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/