unikernel/duniverse/ocaml-caqti/benchmarks/benchmark_stream.ml

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+(* Copyright (C) 2019--2025  Petter A. Urkedal <paurkedal@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version, with the LGPL-3.0 Linking Exception.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * and the LGPL-3.0 Linking Exception along with this library.  If not, see
+ * <http://www.gnu.org/licenses/> and <https://spdx.org>, respectively.
+ *)
+
+open Lwt.Infix
+open Lwt.Syntax
+
+let data = List.init 100_000 begin fun i ->
+  let x = float_of_int (i + 1) in
+  1.0 /. (x *. x)
+end
+
+module Stream_blocking = Caqti_platform.Stream.Make (struct
+  type 'a t = 'a
+  let return x = x
+  module Infix = struct
+    let (>>=) x f = f x
+    let (>|=) x f = f x
+  end
+end)
+
+module Stream_lwt = Caqti_platform.Stream.Make (Lwt)
+
+let rec seq_of_list xs () =
+  (match xs with
+   | [] -> Seq.Nil
+   | x :: xs' -> Seq.Cons (x, seq_of_list xs'))
+
+let test_list () =
+  let _ : float = List.fold_left (+.) 0.0 data in
+  ()
+
+let test_seq =
+  let seq = seq_of_list data in
+  fun () ->
+    let _ : float = Seq.fold_left (+.) 0.0 seq in
+    ()
+
+let test_stream_blocking =
+  let stream = Stream_blocking.of_list data in
+  fun () ->
+    let (_ : float) =
+      (Stream_blocking.fold ~f:(+.) stream 0.0 |> function
+       | Ok x -> x
+       | Error (`Congested (c : Caqti_error.counit)) -> (match c with _ -> .))
+      [@ocaml.warning "-56"] (* coded for backwards compatibility *)
+    in
+    ()
+
+let test_stream_lwt =
+  let stream = Stream_lwt.of_list data in
+  fun () -> Lwt_main.run begin
+    let* (_ : float) =
+      (Stream_lwt.fold ~f:(+.) stream 0.0 >|= function
+       | Ok x -> x
+       | Error (`Congested (c : Caqti_error.counit)) -> (match c with _ -> .))
+      [@ocaml.warning "-56"] (* coded for backwards compatibility *)
+    in
+    Lwt.return_unit
+  end
+
+(*
+let test_lwt_stream =
+  let stream = Lwt_stream.of_list data in (* OBS: Not re-iterable. *)
+  fun () -> Lwt_main.run begin
+    let* (_ : float) = Lwt_stream.fold (+.) stream 0.0 in
+    Lwt.return_unit
+  end
+*)
+
+let () =
+  let res = Benchmark.throughputN 30 [
+    "List", test_list, ();
+    "Seq", test_seq, ();
+    "Stream_blocking", test_stream_blocking, ();
+    "Stream_lwt", test_stream_lwt, ();
+  ] in
+  print_newline ();
+  Benchmark.tabulate res