Well I ran your code on linux( upping the count to 5000), and it starts out at about 4.4% mem (I have a gig of ram). After 2 minutes, it was up to 12.4 % ram. That is roughly a doubling of mem every minute...... that's what I'm talking about.

Also your code is quite simple, meaning it uses modules that "probably" are quite thread safe. I would next start trying to run something like WWW::Mechanize, or LWP::UserAgent in the threads, and see what they add to the garbage leftovers. Maybe Win32 does a better job with garbage collection than linux?

I don't understand what you mean by this? Shared vars are tied. Every time you reference one, the current value is retrieved from the master copy.

In a simple example you are right. I'm talking about (and I should have mentioned it) using GUI's with threads. Gui's will allow you to tie, but that won't work across threads. Here is a simple example, the count is not automatically reflected to the thread. 

#!/usr/bin/perl
use strict;
use warnings;
use threads;
use threads::shared;
use Tk;

my $count:shared=0;
my $thread = threads->new( \&launch_thread )->detach;

my $mw = MainWindow->new();
$mw->geometry("600x400+100+100");

my $l1 = $mw->Label(-textvariable => \$count)->pack();

MainLoop;

sub launch_thread {

   while (1){
       $count++;
       print "$count\n";
       sleep 1;
     }
}

[download]

I'm not very good with a simple Tie, but the following dosn't trigger the fetch or store, in a non-gui script. 

#!/usr/bin/perl
use strict;
use warnings;
use threads;
use threads::shared;
use Tie::Watch;

my $count:shared=0;
my $thread = threads->new( \&launch_thread )->detach;

my $watch = Tie::Watch->new(
   -variable => \$count,
#   -debug    => 1,
   -fetch    => \&fetch,
   -store    => \&store,
   -destroy  => sub {print "Final value=$count.\n"},
);


while(1){}


sub launch_thread {

   while (1){
       $count++;
       print "$count\n";
       sleep 1;
     }
}


sub store {
   print "changed\n";
}

sub fetch{
   print "fetched @_\n";

}

[download]

Maybe you can make the simple Tie report a store?

I'm not really a human, but I play one on earth. Cogito ergo sum a bum

In reply to Re^3: Threads question by zentara
in thread Threads question by xiaoyafeng

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