Timer:tc

[Nebmo]

What is the difference between:

1:

{Time,_} = timer:tc(mod,fun,[arg]),

2:

T1 = erlang:now(),
mod:fun(arg),
T2 = erlang:now(),
Time = timer:now_diff(T2, T1),


When using them in a benchmark, timer:tc gives a number 12 times larger than erlang:now() does.
(I'm mixing hipe-code and beam-code)
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