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CPU profiles
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- bottom-up view:
  - shows at the top of the hierarchy function calls with high self
    CPU time (by default ordered by self CPU time)
  - the tree below a top node is the call stack leading to that
    function
  - apparently, the "Self" and "Total" columns are meaningful for the
    toplevel tree nodes only, and are just repeated for child tree
    nodes
  - the (program) is the whole running time from start to stop of the
    CPU profiler?
  - no "count" column?
  
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  (C) 1998-2017 Olaf Klischat  <olaf.klischat@gmail.com>