From f0d51083a6cda851ed60578a7679e20b1fe5678a Mon Sep 17 00:00:00 2001
From: Rickard Green <rickard@erlang.org>
Date: Sun, 29 Mar 2015 01:29:23 +0100
Subject: Replace erlang:now() usage in emulator suite

---
 erts/emulator/test/estone_SUITE.erl | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

(limited to 'erts/emulator/test/estone_SUITE.erl')

diff --git a/erts/emulator/test/estone_SUITE.erl b/erts/emulator/test/estone_SUITE.erl
index 1de6d6fb56..9fe161cffc 100644
--- a/erts/emulator/test/estone_SUITE.erl
+++ b/erts/emulator/test/estone_SUITE.erl
@@ -339,7 +339,6 @@ micros() ->
     ].
 
 macro(Ms,DataDir) ->
-    erlang:now(),  %% compensate for old 4.3 firsttime clock bug :-(
     statistics(reductions),
     statistics(runtime),
     lists(500),  %% fixup cache on first round
@@ -369,10 +368,9 @@ run_micro(Top, M, DataDir) ->
 apply_micro(M) ->
     {GC0, Words0, _} = statistics(garbage_collection),
     statistics(reductions),
-    Before = erlang:now(),
-
+    Before = erlang:monotonic_time(),
     Compensate = apply_micro(M#micro.function, M#micro.loops),
-    After = erlang:now(),
+    After = erlang:monotonic_time(),
     {GC1, Words1, _} = statistics(garbage_collection),
     {_, Reds} = statistics(reductions),
     Elapsed = subtr(Before, After),
@@ -391,10 +389,7 @@ apply_micro(M) ->
 
 
 subtr(Before, After) ->
-    (element(1,After)*1000000000000
-     +element(2,After)*1000000+element(3,After)) -
-        (element(1,Before)*1000000000000
-         +element(2,Before)*1000000+element(3,Before)).
+    erlang:convert_time_unit(After-Before, native, micro_seconds).
 
 gci(Micros, Words, Gcs) ->
     ((256 * Gcs) / Micros) + (Words / Micros).
@@ -633,10 +628,10 @@ tup_trav(T, P, End) ->
 %% Port I/O
 port_io(I) ->
     EstoneCat = get(estone_cat),
-    Before = erlang:now(),
+    Before = erlang:monotonic_time(),
     Pps = make_port_pids(5, I, EstoneCat),  %% 5 ports
     send_procs(Pps, go),
-    After = erlang:now(),
+    After = erlang:monotonic_time(),
     wait_for_pids(Pps),
     subtr(Before, After).
 
@@ -854,10 +849,10 @@ handle_call(_From, State, [abc]) ->
 
 %% Binary handling, creating, manipulating and sending binaries
 binary_h(I) ->
-    Before = erlang:now(),
+    Before = erlang:monotonic_time(),
     P = spawn(?MODULE, echo, [self()]),
     B = list_to_binary(lists:duplicate(2000, 5)),
-    After = erlang:now(),
+    After = erlang:monotonic_time(),
     Compensate = subtr(Before, After),
     binary_h_2(I, P, B),
     Compensate.
-- 
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