EchoTiming

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`EchoTiming`

[Experimental]

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EchoTiming[expr]

evaluates expr, prints the time in seconds used and returns the result of the evaluation.

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EchoTiming[expr,label]

prints the timing, prepending label.

Details and Options

EchoTiming is a variant of Echo that reports the absolute timing of an evaluation.
EchoTiming has attribute HoldFirst.
The following options can be given:
Method AbsoluteTiming method to use to time the evaluation
Possible settings for the Method option include:

	Timing	print the CPU time spent in the Wolfram Language kernel
	AbsoluteTiming	print the real wall clock time that has elapsed
	RepeatedTiming	print the average timing of several evaluations

The value of Method should be a function of one argument that returns a list {timing,result}. EchoTiming will print timing and return result.

Examples

open allclose all

Basic Examples (2)Summary of the most common use cases

Print the timing of an intermediate computation:

In[1]:=1

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https://wolfram.com/xid/0dqvproibhw-sa2n8z

1.003807`

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0dqvproibhw-89w4ts

0.122255`

Out[2]=2

Print the timing with a label:

In[1]:=1

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https://wolfram.com/xid/0dqvproibhw-k1a85q

"total:" 1.974824`

Out[1]=1

Scope (1)Survey of the scope of standard use cases

Time the construction of all 8-letter subsets in the English alphabet:

In[1]:=1

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https://wolfram.com/xid/0dqvproibhw-xpof14

0.158876`

Out[1]=1

Options (2)Common values & functionality for each option

Method (2)

By default, EchoTiming uses AbsoluteTiming to report timings:

In[1]:=1

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https://wolfram.com/xid/0dqvproibhw-0pd8y4

1.002822`

Out[1]=1

Use Timing to report only time spent in the Wolfram Language kernel:

In[2]:=2

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https://wolfram.com/xid/0dqvproibhw-ji7mw7

0.016015`

Out[2]=2

Define a custom timing function, which must have have a holding attribute like HoldFirst:

In[1]:=1

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https://wolfram.com/xid/0dqvproibhw-7c9czh

Use it as the timing Method:

In[2]:=2

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https://wolfram.com/xid/0dqvproibhw-fbhlmk

3.001204`

Out[2]=2

Applications (2)Sample problems that can be solved with this function

Time EntityValue calls:

In[1]:=1

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https://wolfram.com/xid/0dqvproibhw-fpg7l9

7.550329`

Out[1]=1

Set $Pre to EchoTiming to print the timing of all computations:

In[1]:=1

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https://wolfram.com/xid/0dqvproibhw-y3s8p5

Out[1]=1

The timing gets automatically printed:

In[2]:=2

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https://wolfram.com/xid/0dqvproibhw-qmku3d

1.000641`

Out[2]=2

Unset $Pre:

In[3]:=3

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https://wolfram.com/xid/0dqvproibhw-krslx6

0.`

Properties & Relations (3)Properties of the function, and connections to other functions

With MethodRepeatedTiming, only the result of the first evaluation is returned:

In[1]:=1

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https://wolfram.com/xid/0dqvproibhw-ldtqg2

1.4452075958251954`*^-7

Out[1]=1

EchoTiming can be used to print the timing of intermediate computations without affecting the overall computation:

In[1]:=1

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https://wolfram.com/xid/0dqvproibhw-wip4pl

1.000824`

Out[1]=1

Echo can also be used to print the timing, but at the cost of doing the computation twice, which may not be desirable:

In[2]:=2

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https://wolfram.com/xid/0dqvproibhw-8epnnt

Out[2]=2

EchoTiming is disabled inside QuietEcho:

In[1]:=1

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https://wolfram.com/xid/0dqvproibhw-fo06ot

Out[1]=1

Neat Examples (1)Surprising or curious use cases

Find factorizations of numbers of the form , printing intermediate results and their timings:

In[1]:=1

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https://wolfram.com/xid/0dqvproibhw-rzmusd

0.001037`

0.017554`

0.016168`

0.034751`

3.321073`

"Total:" 3.612442`

Out[1]=1

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