How to benchmark Swift code execution?

Question

Is there a way/software to give precise time needed to execute a block of code written in Swift, other than the following?

let date_start = NSDate()

// Code         


        

Answer 1

You can use this function to measure asynchronous as well as synchronous code:

import Foundation

func measure(_ title: String, block: (@escaping () -> ()) -> ()) {

    let startTime = CFAbsoluteTimeGetCurrent()

    block {
        let timeElapsed = CFAbsoluteTimeGetCurrent() - startTime
        print("\(title):: Time: \(timeElapsed)")
    }
}

So basically you pass a block that accepts a function as a parameter, which you use to tell measure when to finish.

For example to measure how long some call called "myAsyncCall" takes, you would call it like this:

measure("some title") { finish in
    myAsyncCall {
        finish()
    }
    // ...
}

For synchronous code:

measure("some title") { finish in
     // code to benchmark
     finish()
     // ...
}

This should be similar to measureBlock from XCTest, though I don't know how exactly it's implemented there.