Hands-On Design Patterns and Best Practices with Julia

Measuring performance with the @time macro

Julia comes with a useful macro called @time, which measures the time required to execute code. For example, to measure how long it takes to calculate the sum of 10 million random numbers, we can do the following:

The macro works by inserting code around the code that is being measured. The resulting code may look something like the following:

begin    t1 = now()    result = sum(rand(10_000_000))    t2 = now()    elapsed = t2 - t1    println("It took ", elapsed)    resultend

The new code uses the now() function to take the current time. Then, it executes the user-provided code and captures the result. It takes the ...