Ok, I will try but it's difficult because of length and logic of my code. First of all - what does my script do? It takes one line of structured string, parses that string and stores it in hash that looks like: 
 $VAR1 = {
          '0' => {
                   'type' => ...,
                   'value' => ...
                 },
          '1' => {
                   'type' => ..,
                   'value' => ...
                 },
          '2' => {
                   'type' => ...,
                   'value' => ...
                 },
          '3' => {
                   'type' => ...,
                   'value' => ...
                 },
          '4' => {
                   'lvalue' => ...,
                   'rvalue' => ...,
                   'rvalue_type' => ...,
                   'type' => ...
                 }
        };
The aim of script is to generate more (similar in some way) hashes. I store these hashes in array. The main action is generation and it looks like: 
    my $elements_ref = shift; # reference to AoH which at the beginning contains one element
    
    %el = %{$elements_ref->[0]}; # Take first element of AoH
    my @hitlist; # Stores hash keys that indicate hash elements I will change
    
    # ...
    # Fill @hitlist with hash keys that I need. Simple for loop.
    # ...
    
    my $k = @hitlist; # Size of @hitlist. In this case it is equal to 3
    
    my $iter = Algorithm::Combinatorics::variations_with_repetition($new, $k); # Give me all variations of some elements
    
    while (my $var = $iter->next)       
    {
        my $new_el= Storable::dclone \%el;
        
        # Now, for each variation I will create (clone) original %el
        # and in $new_el I will substitute $k elements of hash indicated
        # by keys contained in @hitlist
        
        for (my $j = 0; $j < $k; $j++)
        {   
            my $hit = $hitlist$j;
            
            # ...
            $new_url->... = $var->$j;
            # ...
        }
        
        push @$elements_ref, $new_el; # Store new element in AoH
    }
And the problem is that when at the end I store AoH in hdd it takes 8mb, but while generating it takes 130mb of ram.

In reply to Re^2: Issue with cloning and large structure processing by scathlock
in thread Issue with cloning and large structure processing by scathlock

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