Skip to content

Instantly share code, notes, and snippets.

@legoscia
Forked from manuel-rubio/timestamp_vs_now.erl
Last active December 1, 2018 17:57
  • Star 3 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
Star You must be signed in to star a gist
Save legoscia/5303050 to your computer and use it in GitHub Desktop.
#!/usr/bin/env escript
-mode(compile).
epoch() ->
{Mega,Sec,Mili} = os:timestamp(),
(Mega * 1000000) + Sec + (Mili / 1000000).
measure(F) ->
Ini = epoch(),
F(),
epoch() - Ini.
main(_Args) ->
Times = lists:seq(1,1000000),
Test1 = fun() -> [ os:timestamp() || _ <- Times ] end,
Test2 = fun() -> [ now() || _ <- Times ] end,
io:format("os:timestamp = ~5.2f ~5.2f ~5.2f~n", [
measure(Test1), measure(Test1), measure(Test1)
]),
io:format("erlang:now = ~5.2f ~5.2f ~5.2f~n", [
measure(Test2), measure(Test2), measure(Test2)
]),
0.
@manuel-rubio
Copy link

Good point!, thanks Magnus. Looks like the interpreted code is slower than compiled. Is It due to hipe?

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment