DEPRECATED: use the base/bench library instead
Simple example:

open Core.Std module Bench = Core_extended.Bench

let main () = Bench.bench Bench.Test.create ~name:"test" (fun () -> ignore (Time.now ())) ;;

let () = main ()

module Test : sig .. end
type t
val create : ?name:string -> ?size:int -> (unit -> unit) -> t
val name : t -> string option
val size : t -> int
module Result : sig .. end
module Stat : sig .. end
type t = {
run_cycles : int;
compactions : int;
minor_allocated : int;
major_allocated : int;
promoted : int;
}
val empty : t
type t = string option * int * Stat.t array
val mean : Stat.t array -> Stat.t
val min : Stat.t array -> Stat.t
val max : Stat.t array -> Stat.t
val compactions_occurred : Stat.t array -> bool
verbosity (default low): If low, only prints results. If mid, additionally prints time estimates and a status line. If high, additionally prints information at each step of benchmarking.

gc_prefs: can be used to set custom GC settings during benchmarking (they will be reverted when the function returns)

no_compactions (default false): disables compactions during benchmarking, reverted when the function returns. Takes precedence over gc_prefs.

trials (default `Auto): runs this many trials for each sample. If `Auto, bench will automatically determine the number of trials to run based on how long it takes to run one trial. It will run enough trials n so that the mean cost of calling rdtscp is less than one percent of n, and it takes more than 0.01 seconds.

clock (default wall): controls time measurement method. Wall includes waiting on I/O and when the process is suspended/descheduled; cpu only counts time spent on computations.

type 'a with_benchmark_flags = ?verbosity:[ `High | `Low | `Mid ] ->
?gc_prefs:Core.Std.Gc.Control.t ->
?no_compactions:bool ->
?trials:[ `Auto | `Num of int ] -> ?clock:[ `Cpu | `Wall ] -> 'a
type column = [ `Allocated
| `Cycles
| `Input_size
| `Name
| `Nanos
| `Normalized_cycles
| `Warnings ]
type 'a with_print_flags = ?limit_width_to:int ->
?columns:[ `Allocated
         | `Cycles
         | `If_not_empty of column
         | `Input_size
         | `Name
         | `Nanos
         | `Normalized_cycles
         | `Warnings ] list ->
?display:Textutils.Ascii_table.Display.t -> 'a
The "Name" and "Input size" columns of the printed table reflect the values passed to Test.create. The "Normalized" column is run_time / input_size. "Stdev" reports the standard deviation for the "Run time" column. "Allocated" reports the average number of allocated words through the benchmarks.

"Warnings" may contain single characters indicating various things: 'm' indicates the minimum run time was less than 80% of the mean 'M' indicates the maximum run time was more than 120% of the mean 'c' indicates GC compactions occurred during testing 'a' indicates the number of words allocated was not the same in all tests

limit_with_to defaults to 72.

columns: select which columns to display. `If_not_empty c means print the column only if at least one cell contains something. It defaults to: [`If_not_empty `Name; `Normalized_cycles; `If_not_empty `Warnings].

val bench : (Test.t list -> unit) with_benchmark_flags with_print_flags
val bench_raw : (Test.t list -> Result.t list) with_benchmark_flags
bench_raw returns a list documenting the runtimes rather than printing to stdout. These can be fed to print for results identical to calling bench.
val print : (Result.t list -> unit) with_print_flags