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| author | Dan Gudmundsson <[email protected]> | 2011-03-30 12:50:03 +0200 |
|---|---|---|
| committer | Dan Gudmundsson <[email protected]> | 2011-05-11 16:08:18 +0200 |
| commit | 1d4472c3e6bad242c04ab5925ac12b3053ece323 (patch) | |
| tree | b2e675e2395cfa8a3f1ceb86bbde235d01180797 /lib/stdlib/src/timer.erl | |
| parent | 0a80859714d86191e17f84cf60833010b20655d0 (diff) | |
| download | otp-1d4472c3e6bad242c04ab5925ac12b3053ece323.tar.gz otp-1d4472c3e6bad242c04ab5925ac12b3053ece323.tar.bz2 otp-1d4472c3e6bad242c04ab5925ac12b3053ece323.zip | |
Add timer:tc/1 which measures elapsed time for a fun/0
Also removes the 'catch' from timer:tc functions which masked errors
in measuring code.
Diffstat (limited to 'lib/stdlib/src/timer.erl')
| -rw-r--r-- | lib/stdlib/src/timer.erl | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/lib/stdlib/src/timer.erl b/lib/stdlib/src/timer.erl index b456c5d6c1..78e897b877 100644 --- a/lib/stdlib/src/timer.erl +++ b/lib/stdlib/src/timer.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1996-2010. All Rights Reserved. +%% Copyright Ericsson AB 1996-2011. All Rights Reserved. %% %% The contents of this file are subject to the Erlang Public License, %% Version 1.1, (the "License"); you may not use this file except in @@ -22,7 +22,7 @@ send_after/3, send_after/2, exit_after/3, exit_after/2, kill_after/2, kill_after/1, apply_interval/4, send_interval/3, send_interval/2, - cancel/1, sleep/1, tc/2, tc/3, now_diff/2, + cancel/1, sleep/1, tc/1, tc/2, tc/3, now_diff/2, seconds/1, minutes/1, hours/1, hms/3]). -export([start_link/0, start/0, @@ -101,15 +101,24 @@ sleep(T) -> after T -> ok end. +%% +%% Measure the execution time (in microseconds) for Fun(). +%% +-spec tc(function()) -> {time(), term()}. +tc(F) -> + Before = os:timestamp(), + Val = F(), + After = os:timestamp(), + {now_diff(After, Before), Val}. %% %% Measure the execution time (in microseconds) for Fun(Args). %% -spec tc(function(), [_]) -> {time(), term()}. tc(F, A) -> - Before = erlang:now(), - Val = (catch apply(F, A)), - After = erlang:now(), + Before = os:timestamp(), + Val = apply(F, A), + After = os:timestamp(), {now_diff(After, Before), Val}. %% @@ -117,9 +126,9 @@ tc(F, A) -> %% -spec tc(atom(), atom(), [term()]) -> {time(), term()}. tc(M, F, A) -> - Before = erlang:now(), - Val = (catch apply(M, F, A)), - After = erlang:now(), + Before = os:timestamp(), + Val = apply(M, F, A), + After = os:timestamp(), {now_diff(After, Before), Val}. %% |