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 @space = (
  { node => 1 , "cores" => 12, "memory" => 200 }, 
  { node => 2 , "cores" => 12, "memory" => 500 }, 
  ... 
)

my @new = sort { 

       ($b =~ /=(\d+)/)[0] <=> ($a =~ /=(\d+)/)[0]
...
       fc($a) cmp fc($b) 

   } @old;