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How should we measure the execution time of a function in the OCaml toplevel?
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This chapter describes the toplevel system for OCaml, that permits interactive use of the OCaml system through a read-eval-print loop (REPL). In this mode, the system repeatedly reads OCaml phrases from the input, then typechecks, compile and evaluate them, then prints the inferred type and result value, if any.
In a terminal window, type utop to start the interactive OCaml session, commonly called the toplevel. Press Control-D to exit the toplevel.
:: means 2 camel humps, ' means 1 hump! – Nick Craver. Feb 27, 2010 at 12:09. Ok a decent comment: merd.sourceforge.net/pixel/language-study/… I don't use oCaml, but there's a full syntax list you my find useful, even if there's no real context to it.
In short, the toplevel is OCaml's Read-Eval-Print-Loop (repl) allowing interative use of the OCaml system. You can consider the toplevel an alternative to compiling OCaml into an executable.
As @user3075773 says, you can use Sys.time. However note that it returns processor time (CPU time). More often I want to know the wall clock time (elapsed time). You can get this from Unix.gettimeofday:
let time f x =
let t = Unix.gettimeofday () in
let fx = f x in
Printf.printf "execution elapsed time: %f sec\n"
(Unix.gettimeofday () -. t);
fx
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