Revision 13067b9557fb1d00d0f4f689248a1a37c891665d authored by vbot on 19 June 2020, 10:16:37 UTC, committed by Romain Bardou on 19 June 2020, 15:07:48 UTC
1 parent 16facd8
moving_average.ml
(*****************************************************************************)
(* *)
(* Open Source License *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
(* *)
(* Permission is hereby granted, free of charge, to any person obtaining a *)
(* copy of this software and associated documentation files (the "Software"),*)
(* to deal in the Software without restriction, including without limitation *)
(* the rights to use, copy, modify, merge, publish, distribute, sublicense, *)
(* and/or sell copies of the Software, and to permit persons to whom the *)
(* Software is furnished to do so, subject to the following conditions: *)
(* *)
(* The above copyright notice and this permission notice shall be included *)
(* in all copies or substantial portions of the Software. *)
(* *)
(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR*)
(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *)
(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *)
(* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER*)
(* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *)
(* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *)
(* DEALINGS IN THE SOFTWARE. *)
(* *)
(*****************************************************************************)
open Lwt.Infix
module Inttbl = Hashtbl.Make (struct
type t = int
let equal (x : int) (y : int) = x = y
let hash = Hashtbl.hash
end)
type t = {
id : int;
alpha : int;
mutable total : int64;
mutable current : int;
mutable average : int;
}
let counters = Inttbl.create 51
let updated = Lwt_condition.create ()
let update_hook = ref []
let on_update f = update_hook := f :: !update_hook
let worker_loop () =
let prev = ref @@ Mtime_clock.elapsed () in
let rec inner sleep =
sleep
>>= fun () ->
let sleep = Lwt_unix.sleep 1. in
let now = Mtime_clock.elapsed () in
let elapsed = int_of_float Mtime.Span.(to_ms now -. to_ms !prev) in
prev := now ;
Inttbl.iter
(fun _ c ->
c.average <-
(c.alpha * c.current / elapsed)
+ ((1000 - c.alpha) * c.average / 1000) ;
c.current <- 0)
counters ;
List.iter (fun f -> f ()) !update_hook ;
Lwt_condition.broadcast updated () ;
inner sleep
in
inner (Lwt_unix.sleep 1.)
let worker =
lazy
(Lwt.async (fun () ->
Lwt_utils.worker
"counter"
~on_event:Internal_event.Lwt_worker_event.on_event
~run:worker_loop
~cancel:(fun _ -> Lwt.return_unit)))
let create =
let cpt = ref 0 in
fun ~init ~alpha ->
Lazy.force worker ;
let id = !cpt in
incr cpt ;
assert (0. < alpha && alpha <= 1.) ;
let alpha = int_of_float (1000. *. alpha) in
let c = {id; alpha; total = 0L; current = 0; average = init} in
Inttbl.add counters id c ; c
let add c x =
c.total <- Int64.(add c.total (of_int x)) ;
c.current <- c.current + x
let destroy c = Inttbl.remove counters c.id
type stat = {total : int64; average : int}
let stat ({total; average; _} : t) : stat = {total; average}
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