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$free_space = {
                 "node1" => {
...
                            },
                 ...
}

cores   memory   node
-----   ------   ----
...
11      500      node12
11      200      node3
10      900      node10

my %CoreMemNodes = (); #HoA <free_cores> -> <free_mem> -> (node1,node2
+,..)

...
        }
    }
}