UInt64 vs String Access Times

IntStringDictionary.swift

import Foundation

func benchmark(_ function: () -> ()) -> Double {
	let start = DispatchTime.now()
	function()
	let elapsed = Double(DispatchTime.now().uptimeNanoseconds - start.uptimeNanoseconds) / 1_000_000_000
	return elapsed
}

let count = 10_000_000
var intDic = [UInt64: UInt32]()
var stringIntDic = [UInt64: UInt32]()
var stringDic = [String: UInt32]()

print("Generating Ints")
let ints = (0..<count).map { _ in UInt64(arc4random()) << 32 | UInt64(arc4random()) }
print("Generating Strings")
let strings = ints.map(String.init)
print("Generating Output")
let randomOut = (0..<count).map { _ in arc4random() }

print("Benchmarking")
let intFill = benchmark {
	for i in 0..<count {
		intDic[ints[i]] = randomOut[i]
	}
}
print("Int Fill: \(intFill)")

let stringIntFill = benchmark {
	for i in 0..<count {
		stringIntDic[UInt64(strings[i])!] = randomOut[i]
	}
}
print("String -> Int Fill: \(stringIntFill)")

let stringFill = benchmark {
	for i in 0..<count {
		stringDic[strings[i]] = randomOut[i]
	}
}
print("String Fill: \(stringFill)")

let intRead = benchmark {
	for i in 0..<count {
		_ = intDic[ints[i]]
	}
}
print("Int Read: \(intRead)")

let stringIntRead = benchmark {
	for i in 0..<count {
		_ = stringIntDic[UInt64(strings[i])!]
	}
}
print("String -> Int Read: \(stringIntRead)")

let stringRead = benchmark {
	for i in 0..<count {
		_ = stringDic[strings[i]]
	}
}
print("String Read: \(stringRead)")

let intClear = benchmark {
	for i in 0..<count {
		intDic[ints[i]] = nil
	}
}
print("Int Delete: \(intClear)")

let stringIntClear = benchmark {
	for i in 0..<count {
		stringIntDic[UInt64(strings[i])!] = nil
	}
}
print("String -> Int Delete: \(stringIntClear)")

let stringClear = benchmark {
	for i in 0..<count {
		stringDic[strings[i]] = nil
	}
}
print("String Delete: \(stringClear)")

IntStringMemory.swift

import Foundation

let count = 10_000_000
let wait: UInt32 = 10_000_000

print("Generating Ints")
var ints = (0..<count).map { _ in UInt64(arc4random()) << 32 | UInt64(arc4random()) }
print("Done")
usleep(wait)
print("Generating Strings")
var strings = ints.map(String.init)
print("Done")
usleep(wait)
print("Deleting Ints")
ints = []
print("Done")
usleep(wait)
print("Deleting Strings")
strings = []
print("Done")
usleep(wait)