Optimizing Swift Performance Session 409
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- Frank Aldous Price
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1 Developer Tools #WWDC15 Optimizing Swift Performance Session 409 Nadav Rotem Manager, Swift Performance Team Michael Gottesman Engineer, Swift Performance Team Joe Grzywacz Engineer, Performance Tools 2015 Apple Inc. All rights reserved. Redistribution or public display not permitted without written permission from Apple.
2 Agenda Swift 2.0 performance update Understanding Swift performance Using Instruments to analyze the performance of Swift programs
3 Swift is a Flexible, Safe Programming Language with ARC
4 Swift is a Flexible, Safe Programming Language with ARC Flexible function signature specializations global variable optimizations lock-less metadata caches generics specializations class hierarchy analysis closure optimizations SSA optimizations call graph analysis loop optimizations devirtualization function inliner Safe overflow checks removal bounds checks elimination obj-c bridge optimizations checked casting optimizations ARC ARC optimizer copy forwarding heap to stack code motion alias analysis reference counting analysis copy-on-write optimizations
5 Swift is a Flexible, Safe Programming Language with ARC Flexible function signature specializations global variable optimizations lock-less metadata caches generics specializations class hierarchy analysis closure optimizations SSA optimizations call graph analysis loop optimizations devirtualization function inliner Safe overflow checks removal bounds checks elimination obj-c bridge optimizations checked casting optimizations ARC ARC optimizer copy forwarding heap to stack code motion alias analysis reference counting analysis copy-on-write optimizations
6 Array Bounds Checks Optimizations Swift ensures that array access happen in bounds Swift can lift checks out of loops for i in 0..<n { A[i] ^= 13 O(n) checks become O(1)
7 Array Bounds Checks Optimizations Swift ensures that array access happen in bounds Swift can lift checks out of loops O(n) checks become O(1) for i in 0..<n { precondition (i < length) A[i] ^= 13
8 Array Bounds Checks Optimizations Swift ensures that array access happen in bounds precondition (n length) for i in 0..<n { Swift can lift checks out of loops O(n) checks become O(1) A[i] ^= 13
9 Swift is a Flexible, Safe Programming Language with ARC Flexible Safe ARC function signature specializations overflow checks removal ARC optimizer global variable optimizations bounds checks elimination copy forwarding lock-less metadata caches obj-c bridge optimizations heap to stack generics specializations checked casting optimizations code motion class hierarchy analysis closure optimizations SSA optimizations alias analysis reference counting analysis copy-on-write optimizations call graph analysis loop optimizations devirtualization function inliner
10 Performance Improvements Since 1.0 Optimized programs (higher is better) Richards 7.50 GenericStack 5.34 $.function 4.65 LinkedList 2.53 NSStringConvert x 2x 3x 4x 5x 6x 7x 8x
11 Performance Improvements Since 1.0 Unoptimized programs (higher is better) Richards 5.80 GenericStack 7.80 $.function 4.70 LinkedList 9.10 NSStringConvert x 2x 3x 4x 5x 6x 7x 8x
12 Swift vs. Objective-C Program speed (higher is better) 2.67 Swift Objective-C DeltaBlue Richards 1 1x 2x 3x 4x 5x 6x 7x 8x
13 Swift Compilation Xcode compiles files independently, in parallel Re-compile only files that need to be updated File1.swift File2.swift Optimizer is limited to scope of one file Compiler Compiler File1.o File2.o
14 Whole Module Optimizations Compilation is not limited to the scope of one file File1.swift File2.swift Analyzing the whole module allows better optimizations Whole Module Optimization greatly Compiler improved in Swift 2.0 Better optimizations Parallel code generation File.o
15 Performance Improvements Due to WMO Swift 2 vs Swift 2 + WMO (higher is better) FFT 4.70 NBody x 3x 4x 5x 6x 7x 8x
16 New Optimization Level Configurations
17 New Optimization Level Configurations
18 Writing High Performance Swift Code Michael Gottesman Engineer, Swift Performance Team
19 Overview Reference Counting Generics Dynamic Dispatch
20 Overview Reference Counting Generics Dynamic Dispatch
21 How Reference Counting Works
22 How Reference Counting Works class C {... func foo(c: C?) {... var x: C? = C() var y: C? = x foo(y) y = nil x = nil
23 How Reference Counting Works class C {... func foo(c: C?) {... var x: C? = C() var y: C? = x foo(y) X Class C 21 Boolean Float Double y = nil x = nil
24 How Reference Counting Works class C {... func foo(c: C?) {... var x: C? = C() var y: C? = x foo(y) X Y Class C 32 Boolean Float Double y = nil x = nil
25 How Reference Counting Works class C {... func foo(c: C?) {... var x: C? = C() var y: C? = x foo(y) X Y c Class C 3 Boolean Float Double y = nil x = nil
26 How Reference Counting Works class C {... func foo(c: C?) {... var x: C? = C() var y: C? = x foo(y) X Y Class C 32 Boolean Float Double y = nil x = nil
27 How Reference Counting Works class C {... func foo(c: C?) {... var x: C? = C() var y: C? = x foo(y) X Class C 21 Boolean Float Double y = nil x = nil
28 How Reference Counting Works class C {... func foo(c: C?) {... var x: C? = C() var y: C? = x foo(y) Class C 10 Boolean Float Double y = nil x = nil
29 How Reference Counting Works class C {... func foo(c: C?) {... var x: C? = C() var y: C? = x foo(y) y = nil x = nil
30 Classes That Do Not Contain References class Point { var x, y: Float
31 Classes That Do Not Contain References class Point { var x, y: Float Point Point Point Point Reference Reference Reference Reference Array
32 Classes That Do Not Contain References class Point { var x, y: Float Point Point Point Point var array: [Point] =... for p in array { Reference Reference Reference Reference... Array
33 Classes That Do Not Contain References class Point { var x, y: Float Point Point Point Point var array: [Point] =... for p in array { Reference Reference Reference Reference increment... Array
34 Classes That Do Not Contain References class Point { var x, y: Float Point Point Point Point var array: [Point] =... for p in array { Reference Reference Reference Reference increment... decrement Array
35 Structs That Do Not Contain References struct Point { var x, y: Float Point Point Point Point var array: [Point] =... for p in array { Reference Point Reference Point Reference Point Reference Point increment... decrement Array
36 Structs That Do Not Contain References struct Point { var x, y: Float var array: [Point] =... for p in array { Reference Point Reference Point Reference Point Reference Point increment... decrement Array
37 Structs That Do Not Contain References struct Point { var x, y: Float var array: [Point] =... for p in array { Point Point Point Point... Array All reference counting operations eliminated
38 Structs Containing a Reference
39 Structs Containing a Reference A Struct requires reference counting if its properties require reference counting
40 Structs Containing a Reference A Struct requires reference counting if its properties require reference counting Struct Point Float Float
41 Structs Containing a Reference A Struct requires reference counting if its properties require reference counting Struct Point Float Float UIColor
42 Structs Containing a Reference A Struct requires reference counting if its properties require reference counting Struct Point Float Float UIColor Class 1
43 Structs Containing a Reference A Struct requires reference counting if its properties require reference counting Struct Point Float Float UIColor Struct Point Float Float UIColor Class 1
44 Structs Containing a Reference A Struct requires reference counting if its properties require reference counting Struct Point Float Float UIColor Struct Point Float Float UIColor Class 12
45 Structs Containing Many References Struct User String String String Array Dictionary
46 Structs Containing Many References Class Struct User String String String Array Dictionary 1 Class 1 Class 1 Class 1 Class 1
47 Structs Containing Many References Class Struct User String String String Array Dictionary 1 Class 1 Class 1 Class 1 Class 1 Struct User String String String Array Dictionary
48 Structs Containing Many References Class Struct User String String String Array Dictionary 12 Class 12 Class 12 Class 12 Class 12 Struct User String String String Array Dictionary
49 Use a Wrapper Class Reference Wrapper Class 1 Struct User String String String Array Dictionary Class 1 Class 1 Class 1 Class 1 Class 1
50 Use a Wrapper Class Reference Reference Wrapper Class 12 Struct User String String String Array Dictionary Class 1 Class 1 Class 1 Class 1 Class 1
51 Use a Wrapper Class Reference Reference Wrapper Class 12 Struct User String String String Array Dictionary Class 1 Class 1 Class 1 Class 1 Class 1 Building Better Apps with Value Types in Swift Mission Friday 2:30PM
52 Overview Reference Counting Generics Dynamic Dispatch
53 Overview Reference Counting Generics Dynamic Dispatch
54 How Generics Work func min<t : Comparable>(x: T, y: T) -> T { return y < x? y : x
55 How Generics Work func min<t : Comparable>(x: T, y: T) -> T { return y < x? y : x f func min<t : Comparable>(x: T, y: T) -> T { return y < x? y : x
56 How Generics Work func min<t : Comparable>(x: T, y: T) -> T { return y < x? y : x func min<t : Comparable>(x: T, y: T, FTable: FunctionTable) -> T { let xcopy = FTable.copy(x) let ycopy = FTable.copy(y) let m = FTable.lessThan(yCopy, xcopy)? y : x FTable.release(x) FTable.release(y) return m
57 How Generics Work func min<t : Comparable>(x: T, y: T) -> T { return y < x? y : x func min<t : Comparable>(x: T, y: T, FTable: FunctionTable) -> T { let xcopy = FTable.copy(x) let ycopy = FTable.copy(y) let m = FTable.lessThan(yCopy, xcopy)? y : x FTable.release(x) FTable.release(y) return m
58 How Generics Work func min<t : Comparable>(x: T, y: T) -> T { return y < x? y : x func min<t : Comparable>(x: T, y: T, FTable: FunctionTable) -> T { let xcopy = FTable.copy(x) let ycopy = FTable.copy(y) let m = FTable.lessThan(yCopy, xcopy)? y : x FTable.release(x) FTable.release(y) return m
59 Generic Specialization func foo() { let x: Int =... let y: Int =... let r = min (x, y)...
60 Generic Specialization func foo() { let x: Int =... let y: Int =... let r = min (x, y)...
61 Generic Specialization func foo() { let x: Int =... let y: Int =... let r = min (x, y)... func min<t : Comparable>(x: T, y: T, FTable: FunctionTable) -> T { let xcopy = FTable.copy(x) let ycopy = FTable.copy(y) let m = FTable.lessThan(yCopy, xcopy)? y : x FTable.release(x) FTable.release(y) return m
62 Generic Specialization func foo() { let x: Int =... let y: Int =... let r = min (x, y)... func min<int>(x: Int, y: Int, FTable: FunctionTable) -> Int { let xcopy = FTable.copy(x) let ycopy = FTable.copy(y) let m = FTable.lessThan(yCopy, xcopy)? y : x FTable.release(x) FTable.release(y) return m
63 Generic Specialization func foo() { let x: Int =... let y: Int =... let r = min (x, y)... func min<int>(x: Int, y: Int) -> Int { return y < x? y : x
64 Generic Specialization func foo() { let x: Int =... let y: Int =... let r = min <Int> (x, y)... func min<int>(x: Int, y: Int) -> Int { return y < x? y : x
65 Specialization is Limited by Visibility Module A File1.swift func compute(...) -> Int {... return min(x, y) File2.swift func min<t: Comparable>(x: T, y: T) -> T { return y < x? y : x
66 Specialization is Limited by Visibility Module A File1.swift func compute(...) -> Int {... return min(x, y) Passing Int to min<t> File2.swift func min<t: Comparable>(x: T, y: T) -> T { return y < x? y : x
67 Specialization is Limited by Visibility Module A File1.swift func compute(...) -> Int {... return min(x, y) Passing Int to min<t> File2.swift func min<t: Comparable>(x: T, y: T) -> T { return y < x? y : x Definition not visible in File1
68 Specialization is Limited by Visibility Module A File1.swift func compute(...) -> Int {... return min(x, y) Passing Int to min<t> Must call min<t> File2.swift func min<t: Comparable>(x: T, y: T) -> T { return y < x? y : x Definition not visible in File1
69 Whole Module Optimization Module A File1.swift func compute(...) -> Int {... return min(x, y) File2.swift func min<t: Comparable>(x: T, y: T) -> T { return y < x? y : x Definition not visible in File1
70 Whole Module Optimization Module A File1.swift func compute(...) -> Int {... return min(x, y) File2.swift func min<t: Comparable>(x: T, y: T) -> T { return y < x? y : x Definition is visible in File1 Definition not visible in File1
71 Whole Module Optimization Module A File1.swift func compute(...) -> Int {... return min(x, y) Can call min<int> File2.swift func min<t: Comparable>(x: T, y: T) -> T { return y < x? y : x Definition is visible in File1 Definition not visible in File1
72 Overview Reference Counting Generics Dynamic Dispatch
73 Overview Reference Counting Generics Dynamic Dispatch
74 Dynamic Dispatch
75 Dynamic Dispatch public class Pet func noise() var name func noiseimpl() class Dog override func noise()
76 Dynamic Dispatch public class Pet func makenoise(p: Pet) { print("my name is \(p.name)") func noise() var name func noiseimpl() p.noise() class Dog override func noise()
77 Dynamic Dispatch public class Pet func makenoise(p: Pet) { print("my name is \(p.name)") func noise() var name p.noise() func noiseimpl() func makenoise(p: Pet) { print("my name is \(p.name)") p.noise() class Dog override func noise()
78 Dynamic Dispatch public class Pet func makenoise(p: Pet) { print("my name is \(p.name)") func noise() var name p.noise() func noiseimpl() func makenoise(p: Pet) { class Dog override func noise()
79 Dynamic Dispatch public class Pet func makenoise(p: Pet) { print("my name is \(p.name)") func noise() var name p.noise() func noiseimpl() func makenoise(p: Pet) { class Dog override func noise() let namegetter = Pet.nameGetter(p) print("my name is \(namegetter(p))") let noisemethod = Pet.noiseMethod(p) noisemethod(p)
80 Dynamic Dispatch public class Pet func makenoise(p: Pet) { print("my name is \(p.name)") func noise() var name p.noise() func noiseimpl() func makenoise(p: Pet) { class Dog override func noise() let namegetter = Pet.nameGetter(p) print("my name is \(namegetter(p))") let noisemethod = Pet.noiseMethod(p) noisemethod(p) Can only emit direct calls if it is known that the method is not overridden
81 Communicate API Constraints
82 Communicate API Constraints Inheritance
83 Communicate API Constraints Inheritance Access Control
84 Inheritance public class Pet func noise() var name func noiseimpl() func makenoise(p: Pet) { print("my let namegetter is = Pet.getNameGetter(p) \(p.name)") print("my name is \(namegetter(p))") let noisemethod = Pet.getNoiseMethod(p) noisemethod(p) class Dog override func noise()
85 Inheritance public class Pet func noise() var name func noiseimpl() func makenoise(p: Pet) { print("my let namegetter is = Pet.getNameGetter(p) \(p.name)") print("my name is \(namegetter(p))") let noisemethod = Pet.getNoiseMethod(p) noisemethod(p) class Dog override func noise()
86 Inheritance public class Pet func noise() final var var name name func noiseimpl() func makenoise(p: Pet) { print("my let namegetter is = Pet.getNameGetter(p) \(p.name)") print("my name is \(namegetter(p))") let noisemethod = Pet.getNoiseMethod(p) noisemethod(p) class Dog override func noise()
87 Inheritance public class Pet func noise() final var var name name func noiseimpl() func makenoise(p: Pet) { print("my name is \(p.name)") let noisemethod = Pet.getNoiseMethod(p) noisemethod(p) class Dog override func noise()
88 Access Control public class Pet func noise() final var name override func noiseimpl()? func noiseimpl() class Dog override func noise() override func noiseimpl()?
89 Access Control Module A Pet.swift public class Pet func noise() final var name override func noiseimpl()? func noiseimpl() Dog.swift class Dog override func noise() override func noiseimpl()?
90 Access Control Module A Pet.swift Module B Cat.swift public class Pet func noise() final var name class Cat override func noise() override func noiseimpl()? func noiseimpl() Dog.swift class Dog override func noise() override func noiseimpl()?
91 Access Control Module A Pet.swift Module B Cat.swift public class Pet func noise() final var name class Cat override func noise() override func noiseimpl()? func noiseimpl() Dog.swift class Dog override func noise() override func noiseimpl()?
92 Access Control Module A Pet.swift Module B Cat.swift public class Pet func noise() final var name class Cat override func noise() override func noiseimpl() func noiseimpl() Dog.swift class Dog override func noise() override func noiseimpl()
93 Access Control Module A Pet.swift Module B Cat.swift public class Pet func noise() final var name class Cat override func noise() override func noiseimpl() private func func noiseimpl() Dog.swift class Dog override func noise() override func noiseimpl()
94 Access Control Module A Pet.swift Module B Cat.swift public class Pet func noise() class Cat override func noise() final var name private func func noiseimpl() Dog.swift class Dog override func noise()
95 Whole Module Optimization Module A Pet.swift public class Pet func noise() final var name private func func noiseimpl() Dog.swift class Dog override func noise()
96 Whole Module Optimization Module A Pet.swift public class Pet func noise() func bark(d: Dog) { d.noise() final var name private func func noiseimpl() Dog.swift class Dog override func noise()
97 Whole Module Optimization Module A Pet.swift public class Pet func noise() func bark(d: Dog) { d.noise() final var name private func func noiseimpl() func bark(d: Dog) { Dog.swift class Dog let noisemethod = Dog.getNoiseMethod() noisemethod(d) override func noise()
98 Whole Module Optimization Module A Pet.swift public class Pet func noise() func bark(d: Dog) { d.noise() final var name private func func noiseimpl() Dog.swift class Dog override func noise() func bark(d: Dog) { let noisemethod = Dog.getNoiseMethod() noisemethod(d)
99 Whole Module Optimization Module A Pet.swift public class Pet func noise() func bark(d: Dog) { d.noise() final var name private func func noiseimpl() Dog.swift class Dog func bark(d: Dog) { override func noise()
100 Whole Module Optimization Module A Pet.swift public class Pet func noise() func bark(d: Dog) { d.noise() final var name private func func noiseimpl() Dog.swift class Dog func bark(d: Dog) { d.noise() override func noise()
101 Swift vs. Objective-C Program speed (higher is better) 2.67 Swift Objective-C DeltaBlue Richards 1 1x 2x 3x 4x 5x 6x 7x 8x
102 Communicate your API Intent Use the final keyword and access control Help the compiler understand your class hierarchy Be aware of breaking existing clients Enable Whole Module Optimization
103 Demo Joe Grzywacz Engineer, Performance Tools
104 Summary Swift is a flexible, safe programming language with ARC Write your APIs and code with performance in mind Profile your application with Instruments
105 More Information Swift Language Documentation Apple Developer Forums Stefan Lesser Developer Tools Evangelist
106 Related Sessions Profiling in Depth Mission Thursday 3:30PM Building Better Apps with Value Types in Swift Mission Friday 2:30PM
107
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