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File 0642-snmp-manager-test-Try-to-estimate-appropriate-timeou.patch of Package erlang (Revision 6a6e740c0161086d7407fd293e77c355)

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From 74ca87a3f623e0a86e7544ae4851046a9a576ffc Mon Sep 17 00:00:00 2001
From: Micael Karlberg <bmk@erlang.org>
Date: Thu, 11 Apr 2019 18:50:47 +0200
Subject: [PATCH 3/3] [snmp|manager|test] Try to estimate appropriate timeouts
 for start/stop

For the notify_started02 test case we (now) try estimate how
long we should wait for completion (based on the time of the
first iteration). On slow machines, it takes longer to start and
stop the manager, so adjust the total timeout accordingly.
---
 lib/snmp/test/snmp_manager_test.erl | 126 ++++++++++++++++++++++++++----------
 1 file changed, 93 insertions(+), 33 deletions(-)

diff --git a/lib/snmp/test/snmp_manager_test.erl b/lib/snmp/test/snmp_manager_test.erl
index b2365598af..e376cfcb65 100644
--- a/lib/snmp/test/snmp_manager_test.erl
+++ b/lib/snmp/test/snmp_manager_test.erl
@@ -1020,18 +1020,40 @@ notify_started02(Config) when is_list(Config) ->
 	    {config, [{verbosity, log}, {dir, ConfDir}, {db_dir, DbDir}]}],
 
     p("start snmpm client process"),
-    Pid1 = ns02_loop1_start(),
+    NumIterations = 5,
+    Pid1 = ns02_client_start(NumIterations),
+
+    p("start snmpm ctrl (starter) process"),
+    Pid2 = ns02_ctrl_start(Opts, NumIterations),
+
+    %% On a reasonably fast machine, one iteration takes approx 4 seconds.
+    %% We measure the first iteration, and then we wait for the remaining
+    %% ones (4 in this case).
+    ApproxStartTime =
+        case ns02_client_await_approx_runtime(Pid1) of
+            {ok, T} ->
+                T;
+            {error, Reason} ->
+                %% Attempt cleanup just in case
+                exit(Pid1, kill),
+                exit(Pid2, kill),
+                ?FAIL(Reason);
+            {skip, Reason} ->
+                %% Attempt cleanup just in case
+                exit(Pid1, kill),
+                exit(Pid2, kill),
+                ?SKIP(Reason)
+        end,
 
-    p("start snmpm starter process"),
-    Pid2 = ns02_loop2_start(Opts),
-    
-    p("await snmpm client process exit"),
+    p("await snmpm client process exit (max ~p+10000 msec)", [ApproxStartTime]),
     receive 
 	{'EXIT', Pid1, normal} ->
 	    ok;
 	{'EXIT', Pid1, Reason1} ->
-	    ?FAIL(Reason1)
-    after 25000 ->
+	    ?FAIL({client, Reason1})
+    after ApproxStartTime + 10000 ->
+            exit(Pid1, kill),
+            exit(Pid2, kill),
 	    ?FAIL(timeout)
     end,
 	
@@ -1040,8 +1062,9 @@ notify_started02(Config) when is_list(Config) ->
 	{'EXIT', Pid2, normal} ->
 	    ok;
 	{'EXIT', Pid2, Reason2} ->
-	    ?FAIL(Reason2)
+	    ?FAIL({ctrl, Reason2})
     after 5000 ->
+            exit(Pid2, kill),
 	    ?FAIL(timeout)
     end,
 	
@@ -1049,26 +1072,63 @@ notify_started02(Config) when is_list(Config) ->
     ok.
 
 
-ns02_loop1_start() ->
-    spawn_link(fun() -> ns02_loop1() end).
+ns02_client_start(N) ->
+    Self = self(),
+    spawn_link(fun() -> ns02_client(Self, N) end).
+
+ns02_client_await_approx_runtime(Pid) ->
+    receive
+        {?MODULE, client_time, Time} ->
+            {ok, Time};
+        {'EXIT', Pid, Reason} ->
+            p("client (~p) failed: "
+              "~n      ~p", [Pid, Reason]),
+            {error, Reason}
+                
+    after 15000 ->
+            %% Either something is *really* wrong or this machine 
+            %% is dog slow. Either way, this is a skip-reason...
+            {skip, approx_runtime_timeout}
+    end.
+    
 		       
-ns02_loop1() ->
-    put(tname,ns02_loop1),
+ns02_client(Parent, N) when is_pid(Parent) ->
+    put(tname, ns02_client),
     p("starting"),
-    ns02_loop1(dummy, snmpm:notify_started(?NS_TIMEOUT), 5).
+    ns02_client_loop(Parent, 
+                     dummy, snmpm:notify_started(?NS_TIMEOUT),
+                     snmp_misc:now(ms), undefined,
+                     N).
 
-ns02_loop1(_Ref, _Pid, 0) ->
-    p("done"),
+ns02_client_loop(_Parent, _Ref, _Pid, _Begin, _End, 0) ->
+    %% p("loop -> done"),
     exit(normal);
-ns02_loop1(Ref, Pid, N) ->
-    p("entry when"
-      "~n   Ref: ~p"
-      "~n   Pid: ~p"
-      "~n   N:   ~p", [Ref, Pid, N]),
+ns02_client_loop(Parent, Ref, Pid, Begin, End, N) 
+  when is_pid(Parent) andalso is_integer(Begin) andalso is_integer(End) ->
+    %% p("loop -> [~w] inform parent: ~w, ~w => ~w", [N, Begin, End, End-Begin]),
+    Parent ! {?MODULE, client_time, N*(End-Begin)},
+    ns02_client_loop(undefined, Ref, Pid, snmp_misc:now(ms), undefined, N);    
+ns02_client_loop(Parent, Ref, Pid, Begin, End, N) 
+  when is_integer(Begin) andalso is_integer(End) ->
+    %% p("loop -> [~w] entry when"
+    %%   "~n      Ref:   ~p"
+    %%   "~n      Pid:   ~p"
+    %%   "~n      Begin: ~p"
+    %%   "~n      End:   ~p", [N, Ref, Pid, Begin, End]),
+    ns02_client_loop(Parent, Ref, Pid, snmp_misc:now(ms), undefined, N);    
+ns02_client_loop(Parent, Ref, Pid, Begin, End, N) ->
+    %% p("loop(await message) -> [~w] entry when"
+    %%   "~n      Ref:   ~p"
+    %%   "~n      Pid:   ~p"
+    %%   "~n      Begin: ~p"
+    %%   "~n      End:   ~p", [N, Ref, Pid, Begin, End]),
     receive
 	{snmpm_started, Pid} ->
 	    p("received expected started message (~w)", [N]),
-	    ns02_loop1(snmpm:monitor(), dummy, N);
+	    ns02_client_loop(Parent,
+                             snmpm:monitor(), dummy,
+                             Begin, End,
+                             N);
 	{snmpm_start_timeout, Pid} ->
 	    p("unexpected timout"),
 	    ?FAIL({unexpected_start_timeout, Pid});
@@ -1076,24 +1136,24 @@ ns02_loop1(Ref, Pid, N) ->
 	    p("received expected DOWN message (~w) with"
 	      "~n   Obj:    ~p"
 	      "~n   Reason: ~p", [N, Obj, Reason]),
-	    ns02_loop1(dummy, snmpm:notify_started(?NS_TIMEOUT), N-1)
-    after 10000 ->
-	    ?FAIL(timeout)
+	    ns02_client_loop(Parent,
+                             dummy, snmpm:notify_started(?NS_TIMEOUT),
+                             Begin, snmp_misc:now(ms),
+                             N-1)
     end.
 
-
-ns02_loop2_start(Opts) ->
-    spawn_link(fun() -> ns02_loop2(Opts) end).
+ns02_ctrl_start(Opts, N) ->
+    spawn_link(fun() -> ns02_ctrl(Opts, N) end).
 		       
-ns02_loop2(Opts) ->
-    put(tname,ns02_loop2),
+ns02_ctrl(Opts, N) ->
+    put(tname, ns02_ctrl),
     p("starting"),
-    ns02_loop2(Opts, 5).
+    ns02_ctrl_loop(Opts, N).
 
-ns02_loop2(_Opts, 0) ->
+ns02_ctrl_loop(_Opts, 0) ->
     p("done"),
     exit(normal);
-ns02_loop2(Opts, N) ->
+ns02_ctrl_loop(Opts, N) ->
     p("entry when N: ~p", [N]),
     ?SLEEP(2000),
     p("start manager"),
@@ -1101,7 +1161,7 @@ ns02_loop2(Opts, N) ->
     ?SLEEP(2000),
     p("stop manager"),
     snmpm:stop(),
-    ns02_loop2(Opts, N-1).
+    ns02_ctrl_loop(Opts, N-1).
 
 
 %%======================================================================
-- 
2.16.4

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File 0642-snmp-manager-test-Try-to-estimate-appropriate-timeou.patch of Package erlang (Revision 6a6e740c0161086d7407fd293e77c355)

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