Sorry, it was a mistake of my code.

For HoHoH solution, if I use my own dump routine instead of Dumper:

foreach $path ( keys %db_hash ) {
    print "List for $path...\n";
    foreach $index ( keys %{ $db_hash{$path} } ) {
        print "END: ", $db_hash{$path}{$index}{END}, "\n";
    }
 }

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then following comes to stdout: 
Use of uninitialized value in print at ./utk.pl line 66, <FH> line 246
+99.
Use of uninitialized value in print at ./utk.pl line 66, <FH> line 246
+99.

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line 66 is the line of "print END" routine. In this case, 
$db_hash{$path}{$index}{END}

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tries to access 
$db_hash{$path}{'index'}{END}

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... which does not exist anyway. It was a mistake that I did not use the Dumper.

In reply to Re^4: Creating members of hash of hashes parallelly by utku
in thread Creating members of hash of hashes parallelly by utku

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