Dear Monks, I have a Hash of Hashes, in which the first level contains the names of nodes and the second level contains values for their 'cores' and 'memory', it looks like this: 
$free_space = {
                 "node1" => {
                               "cores" => 12,
                               "mem" => 200
                            },
                 "node2" => {
                               "cores" => 12,
                               "mem" => 500
                            },
                 ...
}

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What I'd like to do is print it out while sorting by 'cores' (descendingly) first, 'memory' (descendingly) second and nodenames (ascendingly) last. So sort by cores, and if the number of cores is equal then sort by memory, if both are equal then sort lexicographically by the node names. It's supposed to look like this: 
cores   memory   node
-----   ------   ----
12      400      node456
12      400      node534
12      350      node23
11      500      node12
11      200      node3
10      900      node10

[download]
I've tried doing it "manually" by creating a new HoHoA, where the 'cores' values are first-level keys, 'memory' values are second-level keys and the array holds the names of the nodes, then printing it simply by sorting level by level, like this: 
my %CoreMemNodes = (); #HoA <free_cores> -> <free_mem> -> (node1,node2
+,..)

foreach my $node (keys %free_space) {
    push @{ $CoreMemNodes{$free_space{$node}{'cores'}}{$free_space{$no
+de}{'mem'}} }, $node;
}

foreach my $free_cores (sort { $b <=> $a } keys %CoreMemNodes) {
    foreach my $free_mem (sort { $b <=> $a } keys %{ $CoreMemNodes{$fr
+ee_cores} }) {
        foreach my $node (sort @{ $CoreMemNodes{$free_cores}{$free_mem
+} }) {
            print "SORTED:$free_cores $free_mem $node\n";
        }
    }
}

[download]
Is there a more efficient solution?

In reply to sort HoH by second level values in specific order by lener

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