From f05374586b18189e54277a25b802d795b08f590b Mon Sep 17 00:00:00 2001 From: Simon Cruanes Date: Tue, 19 Sep 2023 11:35:01 -0400 Subject: [PATCH] make test more deterministic --- test/lwt/t1.expected | 6800 +++++++++++------------------------------- test/lwt/t1.ml | 51 +- 2 files changed, 1836 insertions(+), 5015 deletions(-) diff --git a/test/lwt/t1.expected b/test/lwt/t1.expected index 17f3af8..b09723c 100644 --- a/test/lwt/t1.expected +++ b/test/lwt/t1.expected @@ -1,5206 +1,2006 @@ [{"pid":2,"name":"process_name","ph":"M","args": {"name":"main"}}, {"pid":2,"tid": 3,"name":"thread_name","ph":"M","args": {"name":"t1"}}, {"pid":2,"cat":"trace","id":0,"tid": 3,"ts": 0.00,"name":"outer.loop","ph":"b"}, -{"pid":2,"cat":"trace","id":0,"tid": 3,"ts": 1.00,"name":"outer.loop.step","ph":"b"}, -{"pid":2,"cat":"trace","id":0,"tid": 3,"ts": 2.00,"name":"outer.sleep","ph":"b"}, -{"pid":2,"cat":"trace","id":1,"tid": 3,"ts": 3.00,"name":"inner.loop","ph":"b"}, -{"pid":2,"cat":"trace","id":1,"tid": 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+{"pid":2,"cat":"trace","id":78,"tid": 3,"ts": 1995.00,"name":"inner.loop.step","ph":"e"}, +{"pid":2,"cat":"trace","id":81,"tid": 3,"ts": 1996.00,"name":"inner.loop","ph":"e"}, +{"pid":2,"cat":"trace","id":81,"tid": 3,"ts": 1997.00,"name":"inner.loop.step","ph":"e"}, +{"pid":2,"cat":"trace","id":1,"tid": 3,"ts": 1998.00,"name":"outer.loop","ph":"e"}, +{"pid":2,"cat":"trace","id":1,"tid": 3,"ts": 1999.00,"name":"outer.loop.step","ph":"e"}, +{"pid":2,"cat":"trace","id":80,"tid": 3,"ts": 2000.00,"name":"inner.loop","ph":"e"}, +{"pid":2,"cat":"trace","id":80,"tid": 3,"ts": 2001.00,"name":"inner.loop.step","ph":"e"}, +{"pid":2,"cat":"trace","id":0,"tid": 3,"ts": 2002.00,"name":"outer.loop","ph":"e"}, +{"pid":2,"cat":"trace","id":0,"tid": 3,"ts": 2003.00,"name":"outer.loop.step","ph":"e"}] \ No newline at end of file diff --git a/test/lwt/t1.ml b/test/lwt/t1.ml index ab78023..3bbd5a6 100644 --- a/test/lwt/t1.ml +++ b/test/lwt/t1.ml @@ -2,11 +2,32 @@ open Lwt.Syntax let ( let@ ) = ( @@ ) -let inner_loop i = +module Barrier = struct + type t = { + mutable n: int; + size: int; + cond: unit Lwt_condition.t; + } + + let create size : t = { n = 0; size; cond = Lwt_condition.create () } + + let wait (self : t) : unit Lwt.t = + self.n <- self.n + 1; + if self.n >= self.size then ( + (* all reached barrier, reset and wakeup everyone *) + self.n <- 0; + Lwt_condition.broadcast self.cond (); + Lwt.return () + ) else + Lwt_condition.wait self.cond +end + +let inner_loop ~off i barrier = let rec loop j = if j >= 5 then Lwt.return () else + let* () = Lwt_unix.sleep (float off *. 0.01) in let* () = let@ _sp = Trace_lwt.with_span_lwt ~__FILE__ ~__LINE__ "inner.loop.step" @@ -16,15 +37,18 @@ let inner_loop i = let* () = if j = 2 then + let* () = Lwt_unix.sleep (float off *. 0.01) in let@ _sp = Trace_lwt.with_span_lwt ~__FILE__ ~__LINE__ "sub-sleep" in - Lwt_unix.sleep 0.010 + Lwt_unix.sleep 0.01 else Lwt.return () in - Lwt_unix.sleep 0.006 + let* () = Lwt_unix.sleep 0.06 in + let* () = Barrier.wait barrier in + Lwt.return () in loop (j + 1) @@ -35,25 +59,21 @@ let inner_loop i = in loop 0 -let outer_loop () = +let outer_loop ~off barrier = let rec loop i = - if i = 50 then + if i = 20 then Lwt.return () else let* () = + let* () = Lwt_unix.sleep (float off *. 0.04) in let@ _sp = Trace_lwt.with_span_lwt ~__FILE__ ~__LINE__ "outer.loop.step" in - let fut_sleep = - let@ _sp = - Trace_lwt.with_span_lwt ~__FILE__ ~__LINE__ "outer.sleep" - in - Lwt_unix.sleep 0.09 - in - - let* () = inner_loop i and* () = inner_loop i in - let* () = fut_sleep in + let barrier_inner = Barrier.create 2 in + let* () = inner_loop ~off:0 i barrier_inner + and* () = inner_loop ~off:1 i barrier_inner in + let* () = Barrier.wait barrier in Lwt.return () in loop (i + 1) @@ -69,7 +89,8 @@ let run () : unit Lwt.t = Trace.set_process_name "main"; Trace.set_thread_name "t1"; - let* () = outer_loop () and* () = outer_loop () in + let barrier = Barrier.create 2 in + let* () = outer_loop ~off:0 barrier and* () = outer_loop ~off:1 barrier in Lwt.return () let () =