Downloaded 16 times
![Optimize slow compiling functions
Profile compile time per function, filter by time > 1 ms.
xcodebuild ARCHS=arm64 ONLY_ACTIVE_ARCH=NO -workspace App.xcworkspace -scheme App
clean build OTHER_SWIFT_FLAGS="-Xfrontend -debug-time-function-bodies" | grep [1-9].
[0-9]ms | sort -nr > culprits.txt](https://image.slidesharecdn.com/compiletimeibondarv2-160321064859/75/Objective-C-Swift-Avito-11-2048.jpg)
![Optimize slow compiling functions
What to fix:
• Functions with longest compile time
• Functions with big number of occurrences
2871.3ms /Users/iyubondar/Projects/avito-ios/Models/Domain/Advertisement/Advertisement/Base/AdvertisementImage.swift:2:5 init(url100x75:
String?, url140x105: String?, url240x180: String?, url432x324: String?, url640x480: String?, url1280x960: String?)
932.7ms /Users/iyubondar/Projects/avito-ios/Core/Extensions/UIKitExtensions/UICollectionView/UICollectionView+ChangeAnimations.swift:57:17
final class func changeSet<T : Hashable>(oldArray oldArray: [T], newArray: [T]) -> CollectionViewChangeSet
253.0ms /Users/iyubondar/Projects/avito-ios/Core/Extensions/UIKitExtensions/UICollectionView/UICollectionView+ChangeAnimations.swift:90:17
final class func changeSet<T>(oldArray oldArray: [T], newArray: [T], identityHashFunction: (T) -> Int, identityCheckFunction: (T, T) -> Bool,
equalityCheckFunction: (T, T) -> Bool = default) -> CollectionViewChangeSet
136.0ms /Users/iyubondar/Projects/avito-ios/Presentation/Views/Advertisement/AdvertisementView/AdvertisementPresenter.swift:9:26 @objc
public override func setModel(model: AnyObject!)
91.4ms/Users/iyubondar/Projects/avito-ios/Presentation/Views/Controls/PullToRefresh/ScrollViewRefresher.swift:251:18 private func
handleRefreshingProgressChanged(progress: RefreshingProgress)
84.0ms/Users/iyubondar/Projects/avito-ios/VIPER/SelectCategoryParameters/Validation/SelectFromToValidator.swift:52:25 private final class func
findValidRowIndex(valuesToSelect: [SelectCategoryParameterViewModel.Data], inCompareToValues compareValues:
[SelectCategoryParameterViewModel.Data]?, selectedRowIndex: Int, iterationOrder: IterationOrder) -> Int
82.5ms/Users/iyubondar/Projects/avito-ios/Presentation/Views/Profile/ProfileViewPresenter.swift:30:10 @objc func notificationsSubtitle() -> String
81.8ms<invalid loc> init?(rawValue: String)
currentDate: NSDate, calendar: NSCalendar, todayDateFormatter: NSDateFormatter, yesterdayDateFormatter: NSDateFormatter, weekdayDateFormatter:
NSDateFormatter, dayDateFormatter: NSDateFormatter, yearDayDateFormatter: NSDateFormatter, fullDateFormatter: NSDateFormatter) -> String
8659 occurrences found.](https://image.slidesharecdn.com/compiletimeibondarv2-160321064859/75/Objective-C-Swift-Avito-12-2048.jpg)
![Use map() and flatMap() with care
1177 occurrences found
Compile time: 2.5 … 21.8 ms
Optimize slow compiling functions
private lazy var tabControllers: [UIViewController] = {
var controllers = [UIViewController?](count: Tab.tabsCount, repeatedValue: nil)
controllers[Tab.Search.rawValue] = self.categoriesNavigationController()
controllers[Tab.Favorites.rawValue] = self.favoritesNavigationController()
controllers[Tab.Publish.rawValue] = self.publishNavigationController()
controllers[Tab.Messenger.rawValue] = self.channelsRootViewController()
controllers[Tab.Profile.rawValue] = self.profileNavigationController()
return controllers.flatMap { $0 }
}()](https://image.slidesharecdn.com/compiletimeibondarv2-160321064859/75/Objective-C-Swift-Avito-16-2048.jpg)
![Use map() and flatMap() with care
Optimize slow compiling functions
Original example: http://irace.me/swift-profiling
return [CustomType()] + array.map(CustomType.init) + [CustomType()]
Compile time: 3158.2 ms and many occurrences](https://image.slidesharecdn.com/compiletimeibondarv2-160321064859/75/Objective-C-Swift-Avito-17-2048.jpg)
![Give «type hints» to the compiler when necessary
* example by IMPATHIC
http://blog.impathic.com/post/99647568844/debugging-slow-swift-compile-times
Optimize slow compiling functions
func hangCompiler() { ["A": [ ["B": [ 1, 2, 3, 4, 5 ]], ["C": [ ]], ["D": [ ["A":
[ 1 ]] ]] ]] }
Build time: 54.249 s
func hangCompiler() { ["A": [ ["B": [ 1, 2, 3, 4, 5 ]] as [String: [Int]], ["C": [ ]]
as [String: [Int]], ["D": [ ["A": [ 1 ]] as [String: [Int]] ]] ]] }
Build time: 1.293 s](https://image.slidesharecdn.com/compiletimeibondarv2-160321064859/75/Objective-C-Swift-Avito-18-2048.jpg)
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"Ускорение сборки большого проекта на Objective-C + Swift" Иван Бондарь (Avito)
- 1. Speed up buildtime of big project on Objective-C + Swift Ivan Bondar Lead iOS developer in Avito
- 2. Build time: 194.803s 75%of build time - Compile Swift files phase Swift: - *.swift files: 626 - LOC: 27264 Project structure Objective-C: - *.m files: 729 - LOC: 45947 - 217 imports in bridging-header
- 3. What to do •Tune build settings • Reduce .swift files count • Reduce extensions count • Optimize slow compiling functions • Fix warnings • Apply ccache compiler cache utility
- 4. Tune build settings BuildActive Architecture Only Enable Objective-C Modules Debug data format - DWARF (no dsym file) Enable Whole module optimization
- 5. Tune build settings Debugdata format - DWARF (no dsym file) Build time: 191.623s (194.803s before)
- 6. Tune build settings Wholemodule optimization Main target build time: 76.614 s Not suitable for debugging Can’t compile unit test target - segfault or weird errors with Swift-ObjC bridging
- 7. Reduce .swift filescount Pre-build action - merge all Swift code to one FAT Swift file Not suitable for big projects: - can’t compile with segmentation fault 11 - eliminates «private» modifier - can’t use breakpoints in the original source
- 8. Reduce .swift filescount Merge different classes/protocols in big .swift files Not suitable for VIPER in general Decided to apply only in certain cases, e.g. put Input and Output protocol declarations in one file
- 9. Reduce extensions count 0 10 20 30 40 1001000 2000 3000 5000 10000 methods extensions * by Dmitry Bespalov https://tech.zalando.com/blog/speeding-up-xcode-builds/
- 10. Reduce extensions count classFilterViewController: UIViewController { } // MARK: UITableViewDelegate extension FilterViewController: UITableViewDelegate { } // MARK: UITableViewDataSource extension FilterViewController: UITableViewDataSource { } class FilterViewController: UIViewController, UITableViewDelegate, UITableViewDataSource { // MARK: UITableViewDelegate // MARK: UITableViewDataSource } Changes in code style applied Before: After: Extensions count reduced by 400 Build time: 94.3s (191.623s before)
- 11. Optimize slow compilingfunctions Profile compile time per function, filter by time > 1 ms. xcodebuild ARCHS=arm64 ONLY_ACTIVE_ARCH=NO -workspace App.xcworkspace -scheme App clean build OTHER_SWIFT_FLAGS="-Xfrontend -debug-time-function-bodies" | grep [1-9]. [0-9]ms | sort -nr > culprits.txt
- 12. Optimize slow compilingfunctions What to fix: • Functions with longest compile time • Functions with big number of occurrences 2871.3ms /Users/iyubondar/Projects/avito-ios/Models/Domain/Advertisement/Advertisement/Base/AdvertisementImage.swift:2:5 init(url100x75: String?, url140x105: String?, url240x180: String?, url432x324: String?, url640x480: String?, url1280x960: String?) 932.7ms /Users/iyubondar/Projects/avito-ios/Core/Extensions/UIKitExtensions/UICollectionView/UICollectionView+ChangeAnimations.swift:57:17 final class func changeSet<T : Hashable>(oldArray oldArray: [T], newArray: [T]) -> CollectionViewChangeSet 253.0ms /Users/iyubondar/Projects/avito-ios/Core/Extensions/UIKitExtensions/UICollectionView/UICollectionView+ChangeAnimations.swift:90:17 final class func changeSet<T>(oldArray oldArray: [T], newArray: [T], identityHashFunction: (T) -> Int, identityCheckFunction: (T, T) -> Bool, equalityCheckFunction: (T, T) -> Bool = default) -> CollectionViewChangeSet 136.0ms /Users/iyubondar/Projects/avito-ios/Presentation/Views/Advertisement/AdvertisementView/AdvertisementPresenter.swift:9:26 @objc public override func setModel(model: AnyObject!) 91.4ms/Users/iyubondar/Projects/avito-ios/Presentation/Views/Controls/PullToRefresh/ScrollViewRefresher.swift:251:18 private func handleRefreshingProgressChanged(progress: RefreshingProgress) 84.0ms/Users/iyubondar/Projects/avito-ios/VIPER/SelectCategoryParameters/Validation/SelectFromToValidator.swift:52:25 private final class func findValidRowIndex(valuesToSelect: [SelectCategoryParameterViewModel.Data], inCompareToValues compareValues: [SelectCategoryParameterViewModel.Data]?, selectedRowIndex: Int, iterationOrder: IterationOrder) -> Int 82.5ms/Users/iyubondar/Projects/avito-ios/Presentation/Views/Profile/ProfileViewPresenter.swift:30:10 @objc func notificationsSubtitle() -> String 81.8ms<invalid loc> init?(rawValue: String) currentDate: NSDate, calendar: NSCalendar, todayDateFormatter: NSDateFormatter, yesterdayDateFormatter: NSDateFormatter, weekdayDateFormatter: NSDateFormatter, dayDateFormatter: NSDateFormatter, yearDayDateFormatter: NSDateFormatter, fullDateFormatter: NSDateFormatter) -> String 8659 occurrences found.
- 13. Use lazy onlywhen it's necessary 1204 occurrences found Compile time: 1.0 … 11.8 ms Optimize slow compiling functions private lazy var footerLabel: UILabel = { let footerLabel = UILabel() footerLabel.textColor = SpecColors.mainText footerLabel.font = SpecFonts.regular(14) footerLabel.autoresizingMask = .FlexibleWidth footerLabel.lineBreakMode = .ByWordWrapping footerLabel.numberOfLines = 0 footerLabel.textAlignment = .Center footerLabel.shadowColor = UIColor.whiteColor() footerLabel.shadowOffset = CGSize(width: 0, height: -1) return footerLabel }()
- 14. Avoid long expressions Compiletime: 2871.3ms Optimize slow compiling functions self.thumbnailUrl = url240x180 ?? url140x105 ?? url100x75 ?? nil self.fullImageUrl = url640x480 ?? url432x324 ?? url1280x960 ?? url240x180 ?? url140x105 ?? url100x75 ?? nil self.thumbnailUrl = url240x180 ?? url140x105 ?? url100x75 self.fullImageUrl = url640x480 ?? url432x324 ?? url1280x960 ?? url240x180 ?? url140x105 ?? url100x75 Compile time: 916 ms
- 15. Avoid long expressions Optimizeslow compiling functions var fullImageUrl: String? { if let url640x480 = url640x480 { return url640x480 } if let url432x324 = url432x324 { return url432x324 } … if let url100x75 = url100x75 { return url100x75 } return nil } Compile time: <1 ms
- 16. Use map() andflatMap() with care 1177 occurrences found Compile time: 2.5 … 21.8 ms Optimize slow compiling functions private lazy var tabControllers: [UIViewController] = { var controllers = [UIViewController?](count: Tab.tabsCount, repeatedValue: nil) controllers[Tab.Search.rawValue] = self.categoriesNavigationController() controllers[Tab.Favorites.rawValue] = self.favoritesNavigationController() controllers[Tab.Publish.rawValue] = self.publishNavigationController() controllers[Tab.Messenger.rawValue] = self.channelsRootViewController() controllers[Tab.Profile.rawValue] = self.profileNavigationController() return controllers.flatMap { $0 } }()
- 17. Use map() andflatMap() with care Optimize slow compiling functions Original example: http://irace.me/swift-profiling return [CustomType()] + array.map(CustomType.init) + [CustomType()] Compile time: 3158.2 ms and many occurrences
- 18. Give «type hints»to the compiler when necessary * example by IMPATHIC http://blog.impathic.com/post/99647568844/debugging-slow-swift-compile-times Optimize slow compiling functions func hangCompiler() { ["A": [ ["B": [ 1, 2, 3, 4, 5 ]], ["C": [ ]], ["D": [ ["A": [ 1 ]] ]] ]] } Build time: 54.249 s func hangCompiler() { ["A": [ ["B": [ 1, 2, 3, 4, 5 ]] as [String: [Int]], ["C": [ ]] as [String: [Int]], ["D": [ ["A": [ 1 ]] as [String: [Int]] ]] ]] } Build time: 1.293 s
- 19. Optimize slow compilingfunctions Build time: 92.5s (94.3s before) No great effect in our case Before: • 8659 functions > 1ms • max time 2871.3мс • median time 1.8ms After: • 2227 functions > 1ms • max time 124.3мс • median time 3.4ms
- 20. Fix warnings Swift CompilerWarnings: 64 total Warning type Count Build time after fix Parameters of ... have different optionality 3 92.5s User-defined 2 92.5s Cannot find protocol definition 3 90.481s Overriding instance method parameter with implicitly unwraped optional type 27 warnings 27 90.195s Deprecation 18 93.487s <Some code> will never been executed 1 93.654s Immutable value ... was never used 1 93.152s Pointer is missing nullability specifier 9 80.667s Build time: 80.667s (92.5s before)
- 21. Fix warnings But, with1 warning <Some code> will never been executed, build time is 84.919s Fix all Swift Compiler Warnings to speed up build time!
- 22. Apply ccache compilercache utility Build time: 68.403s (80.667s before) ccache limitations: - no support for Clang modules - no support for precompiled headers - no Swift support ccache applied to project
- 23. What was done Before:194.803 s After: 68.403 s There is no silver bullet :( • Tune build settings - 3s • Reduce .swift files count - 0s • Reduce extensions count - 97s • Optimize slow compiling functions - 2s • Fix warnings - 12s • Apply ccache compiler cache utility -12s
- 24. Injection for Xcodeplugin: + dynamically inserts new Swift / Objective-C code into a running app + support «tunable parameters» Source: https://github.com/johnno1962/injectionforxcode
- 25. Injection for Xcodeplugin: Source: https://github.com/johnno1962/injectionforxcode Swift limitations. It’s not possible to: - Make changes to Structs. - Change functions or classes that are marked as final. - Change global functions or variables that are not constrained into a class.
- 26. Split app intoframeworks with no cyclic dependencies between classes of different frameworks * Plans * idea and image: http://bits.citrusbyte.com/improving-swift-compile-time/
- 27. Further legacy coderefactoring, remove Swift - Objective C dependencies. Plans
- 28. Links • http://bits.citrusbyte.com/improving-swift-compile-time/ • http://stackoverflow.com/questions/25537614/why-is-swift-compile-time-so-slow General: •http://blog.impathic.com/post/99647568844/debugging-slow-swift-compile-times • http://irace.me/swift-profiling Debug slow compile time: • https://tech.zalando.com/blog/speeding-up-xcode-builds/ • https://gist.github.com/lucholaf/e37f4d26e406250a156a Speed up builds: • https://developer.apple.com/videos/play/wwdc2015/409/ • http://useyourloaf.com/blog/swift-whole-module-optimization/ • http://useyourloaf.com/blog/modules-and-precompiled-headers/ • https://labs.spotify.com/2013/11/04/shaving-off-time-from-the-ios-edit-build-test-cycle/ • http://tomj.io/2015/08/29/speed-up-your-swift-test-builds-by-70-percent.html • https://pewpewthespells.com/blog/managing_xcode.html#dep-imp Build settings: • https://pspdfkit.com/blog/2015/ccache-for-fun-and-profit/ • https://ccache.samba.org/manual.html#_configuration ccache utility:
- 29.