Is there an efficient way to calculate execution time in golang?

go execution-time
Özgür Yalçın picture Özgür Yalçın · Aug 19, 2017 · Viewed 25.8k times · Source

I'm looking for the best way to calculate execution time in go.

func main() {
    start := time.Now()

    time.Sleep(time.Second * 2)

    //something doing here

    elapsed := time.Since(start)
    fmt.Printf("page took %s", elapsed)
}

The code above works fine.

But when I use templates, I have to write it again for each template function.

Is there an efficient way of calculating execution time, including templates?

Answer

Cerise Limón picture Cerise Limón · Aug 19, 2017

If you are timing an entire function, then you can use defer to eliminate some of the repetitive code.

func elapsed(what string) func() {
    start := time.Now()
    return func() {
        fmt.Printf("%s took %v\n", what, time.Since(start))
    }
}

func main() {
    defer elapsed("page")()  // <-- The trailing () is the deferred call
    time.Sleep(time.Second * 2)
}

playground example

Related questions

How to check if a map contains a key in Go?

I know I can iterate over a map m by, for k, v := range m { ... } and look for a key but is there a more efficient way of testing a key's existence in a map? I couldn't find the answer …

Read More
How can I convert a zero-terminated byte array to string?

I need to read [100]byte to transfer a bunch of string data. Because not all of the strings are precisely 100 characters long, the remaining part of the byte array is padded with 0s. If I convert [100]byte to string by: …

Read More
How to efficiently concatenate strings in go

In Go, a string is a primitive type, which means it is read-only, and every manipulation of it will create a new string. So if I want to concatenate strings many times without knowing the length of the resulting string, …

Read More