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AbsoluteTiming

AbsoluteTiming[expr]
evaluates expr, returning a list of the absolute number of seconds in real time that have elapsed, together with the result obtained.

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AbsoluteTiming has attribute HoldAll.

AbsoluteTiming[expr;] will give {timing, Null}.

AbsoluteTiming is always accurate down to a granularity of $TimeUnit seconds, but on many systems is much more accurate.

EXAMPLES

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Basic Examples (2)

Get the total time to do a computation:

In[1]:=

Out[1]=

Timing just reports CPU time used:

In[2]:=

Out[2]=

AbsoluteTiming takes into account all time, including getting data over the internet if needed:

In[1]:=

Out[1]=

The second time it is run is faster since the data has been saved for immediate reuse:

In[2]:=

Out[2]=

SEE ALSO

Timing TimeConstrained SessionTime AbsoluteTime TimeConstraint $TimeUnit

TUTORIALS

Date and Time Functions

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Date & Time

Time Measurement & Optimization

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