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71 lines
1.8 KiB
71 lines
1.8 KiB
(*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*)
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(** Timers for runtime statistics *)
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open NS0
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type t =
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{ mutable ustart: float
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; mutable sstart: float
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; mutable uaggregate: float
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; mutable saggregate: float
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; mutable count: int
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; mutable max: float
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; mutable threshold: float
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; name: string }
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let enabled = ref false
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let start t =
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if !enabled then (
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let {Unix.tms_utime; tms_stime} = Unix.times () in
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t.ustart <- tms_utime ;
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t.sstart <- tms_stime )
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let stop_ t =
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let {Unix.tms_utime; tms_stime} = Unix.times () in
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let ud = tms_utime -. t.ustart in
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let sd = tms_stime -. t.sstart in
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t.uaggregate <- t.uaggregate +. ud ;
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t.saggregate <- t.saggregate +. sd ;
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let usd = ud +. sd in
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if Float.(t.max < usd) then t.max <- usd ;
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t.count <- t.count + 1 ;
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(tms_utime, tms_stime)
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let stop t = if !enabled then stop_ t |> (ignore : float * float -> unit)
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let stop_report t report =
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if !enabled then
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let tms_utime, tms_stime = stop_ t in
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let elapsed = tms_utime +. tms_stime -. (t.ustart +. t.sstart) in
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if Float.(elapsed > t.threshold) then (
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t.threshold <- elapsed ;
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report ~name:t.name ~elapsed:(elapsed *. 1000.)
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~aggregate:((t.uaggregate +. t.saggregate) *. 1000.)
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~count:t.count )
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let create ?at_exit:printf name =
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let t =
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{ ustart= 0.
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; uaggregate= 0.
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; sstart= 0.
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; saggregate= 0.
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; count= 0
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; max= 0.
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; threshold= 0.
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; name }
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in
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Option.iter printf ~f:(fun report ->
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at_exit (fun () ->
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if !enabled then
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report ~name:t.name ~elapsed:(t.max *. 1000.)
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~aggregate:((t.uaggregate +. t.saggregate) *. 1000.)
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~count:t.count ) ) ;
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t
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