From: ts <decoux@...>
Date: 2001-06-10T00:13:36+09:00
Subject: [ruby-talk:16361] Re: Garbage Collection?

>>>>> "M" == Michael Davis <mdavis@sevainc.com> writes:

M> I have narrowed the issue down a little further.  It appears to be related 
M> to Marshal.dump() and/or the << method, the += method does not eat memory. 

pigeon% cat b.rb
#!/usr/bin/ruby
def test_str_cat(count)
   a = ''
   0.upto(count) do |i|
      system("ps aux | grep b.rb | grep -v grep") if i % 10 == 1
      0.upto(99999) do |i|
         a << 'aaaa'
      end
      a = ''
      GC.start
   end
end
 
system("ps aux | head -1")
test_str_cat(200)
system("ps aux | grep b.rb | grep -v grep")
 
pigeon% 

pigeon% b.rb
USER       PID %CPU %MEM   VSZ  RSS TTY      STAT START   TIME COMMAND
ts       25282 50.0  0.5  2476 1308 pts/0    S    17:08   0:00 ruby ./b.rb
ts       25282 99.9  0.5  2476 1308 pts/0    S    17:08   0:05 ruby ./b.rb
ts       25282 99.9  0.5  2476 1308 pts/0    S    17:08   0:10 ruby ./b.rb
ts       25282 99.9  0.5  2476 1308 pts/0    S    17:08   0:15 ruby ./b.rb
ts       25282 99.5  0.5  2476 1308 pts/0    S    17:08   0:19 ruby ./b.rb
ts       25282 99.0  0.5  2476 1308 pts/0    S    17:08   0:24 ruby ./b.rb
ts       25282 98.7  0.5  2476 1308 pts/0    S    17:08   0:29 ruby ./b.rb
ts       25282 98.4  0.5  2476 1308 pts/0    S    17:08   0:34 ruby ./b.rb
ts       25282 98.3  0.5  2476 1308 pts/0    S    17:08   0:39 ruby ./b.rb
ts       25282 98.1  0.5  2476 1308 pts/0    S    17:08   0:44 ruby ./b.rb
ts       25282 98.0  0.5  2476 1308 pts/0    S    17:08   0:49 ruby ./b.rb
ts       25282 97.9  0.5  2476 1308 pts/0    S    17:08   0:53 ruby ./b.rb
ts       25282 97.8  0.5  2476 1308 pts/0    S    17:08   0:58 ruby ./b.rb
ts       25282 97.8  0.5  2476 1308 pts/0    S    17:08   1:03 ruby ./b.rb
ts       25282 97.7  0.5  2476 1308 pts/0    S    17:08   1:08 ruby ./b.rb
ts       25282 97.7  0.5  2476 1308 pts/0    S    17:08   1:13 ruby ./b.rb
ts       25282 97.6  0.5  2476 1308 pts/0    S    17:08   1:18 ruby ./b.rb
ts       25282 97.6  0.5  2476 1308 pts/0    S    17:08   1:22 ruby ./b.rb
ts       25282 97.5  0.5  2476 1308 pts/0    S    17:08   1:27 ruby ./b.rb
ts       25282 97.5  0.5  2476 1308 pts/0    S    17:08   1:32 ruby ./b.rb
ts       25282 97.5  0.5  2476 1308 pts/0    S    17:08   1:37 ruby ./b.rb
pigeon%
 
M>  I wonder if it could be an issue with realloc not interacting properly 
M> with garbage collection.  Any suggestions?

 What is your OS ?

Guy Decoux