I'm using a module that is very memory intensive. I'm also calling one of it's functions many times which construct a large amount of data. I would like to free the memory between each call so that my program can run with out running out of memory. I wrote the subroutine below but it doesn't completely free all of the memory. The program still runs out of memory. Can anyone see what else I need to do? The module I'm using is Spreadsheet::ParseExcel incase your wondering.
Thanks.

sub deleteref
{   
    my $ref = shift;
    foreach my $k (keys %$ref) {
        if (ref($ref->{$k}) eq 'SCALAR') {
            delete($ref->{$k});
        } elsif (ref($ref->{$k}) eq 'HASH') {
            deleteref($ref->{$k});
        } elsif (ref($ref->{$k}) eq 'ARRAY') {
            undef(@{$ref->{$k}});
        } elsif (ref($ref->{$k}) eq 'CODE') {
            delete($ref->{$k});
        } elsif (ref($ref->{$k}) eq 'REF') {
            deleteref($ref->{$k});
        } elsif (ref($ref->{$k}) eq 'LVALUE') {
            delete($ref->{$k});
        #} elsif (ref($ref->{$k}) eq '') {
        } else {
            delete($ref->{$k});
        }
    }
    undef(%$ref);
}
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