Stopwatch function in Julia

Question

In MATLAB, there are a pair of functions tic and toc which can be used to start and stop a stopwatch timer. An example taken from link:

tic
A = rand(12000, 4400);
B = rand(12000, 4400);
toc
C = A'.*B';
toc

I am aware that there is a macro @time in Julia that has similar functionality.

julia> @time [sin(cos(i)) for i in 1:100000];
elapsed time: 0.00721026 seconds (800048 bytes allocated)

Is there a set of similar functions in Julia? The @time macro works well for timing statements that can be written in one or two lines. For longer portions of code, I would prefer to use tic-toc functions.

What I tried

When I googled "julia stopwatch", I found one useful link and four unrelated links.

Introducing Julia/Metaprogramming - Wikibooks, open ... Meta-programming is when you write Julia code to process and modify Julia code. ... The @time macro inserts a "start the stopwatch" command at the beginning ...
Our Invisible Stopwatch promo - YouTube Video for julia stopwatch
Julia Larson on Twitter: "This #Mac OSX timer/stopwatch is ...
Timing episodes of The French Chef with a stopwatch
julia griffith | Oiselle Running Apparel for Women

I don't know why I hadn't thought of just trying tic() and toc().

Julia has tic() and toc() too... However, please do read the Julia Performance Tips docs.julialang.org/en/latest/manual/performance-tips/… ... The tl;dr is that you will be best off putting your computation inside of a function rather than doing everything at global scope, after which using @time will be simple. @time is also advantageous in that it reports memory allocation in addition to time. — Isaiah Norton
– Isaiah Norton, Commented Jul 20, 2015 at 20:50
I don't see why this deserved a down-vote (maybe the extraneous material in the "What I tried section?). Overly harsh. +1 back to 0. Also, I strongly second Isaiah's comment. 90% of the "Why is my Julia slow" questions occur because the author is working in global scope, ie did not wrap code inside a function. — Colin T Bowers
– Colin T Bowers, Commented Jul 20, 2015 at 23:53
@ColinTBowers I had actually received two downvotes. My guess is that cause was that the downvoters were upset that I did not just try tic() and toc(). I later added the "What I tried" section to explain why it was not obvious to me when I searched that the functions tic() and toc() actually exited in Julia. — I Like to Code
– I Like to Code, Commented Jul 21, 2015 at 2:18
Understood. A "What I tried" section is usually a good idea, and making it explicit like you have is even better. Of course, sometimes people can get a bit silly. I remember when this question was closed because it didn't initially contain a "what I have tried" section... — Colin T Bowers
– Colin T Bowers, Commented Jul 21, 2015 at 3:17

Johan Larsson · Accepted Answer · 2020-12-11 10:56:51Z

8

tic() and toc() have been deprecated as of https://github.com/JuliaLang/julia/commit/1b023388f49e13e7a42a899c12602d0fd5d60b0a

You can use @elapsed and @time for longer chunks by wrapping them in an environment, like so:

t = @elapsed begin
    ...
end

There is also TickTock.jl, which has reimplemented tic() and toc() and tick() and tock().

using TickTock
tick()
# Started timer at 2017-12-13T22:30:59.632
tock()
# 55.052638936 ms: 55 seconds, 52 milliseconds

answered Dec 11, 2020 at 10:56

Johan Larsson

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Comments

IainDunning · Accepted Answer · 2015-07-20 21:18:21Z

6

From a search of the Julia documentation

tic()

Set a timer to be read by the next call to toc() or toq(). The macro call @time expr can also be used to time evaluation.

answered Jul 20, 2015 at 21:18

IainDunning

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2 Comments

PatrickT Over a year ago

as Julia has changed since you answered, the links to the docs are dead and the tic and toc have been deprecated. If you could, it would be great to update it. Thanks.

Shep Bryan Over a year ago

tic() has been depreciated

Shep Bryan · Accepted Answer · 2022-03-17 18:43:11Z

1

You can also use time() to get similar output. For example:

t = time()

# code block here
# ...
# ...

dt = time() - t

answered Mar 17, 2022 at 18:43

Shep Bryan

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