Overview
The article introduces Uber Poet, an open-source mock application generator designed to help determine faster Swift builds by simulating various dependency structures. It discusses the motivation behind the tool, its design principles, and how Swift developers can leverage it for testing and benchmarking build times.
What You'll Learn
1
How to use Uber Poet to benchmark Swift build times
2
Why dependency graph architecture affects build performance
3
When to apply whole module optimization for Swift builds
Prerequisites & Requirements
- Understanding of Swift and its build processes
- Familiarity with Xcode and Buck
Key Questions Answered
How does Uber Poet help improve Swift build times?
Uber Poet allows developers to simulate different dependency structures without refactoring their code. By generating mock applications, it helps identify which module architectures yield faster build times, thus optimizing the development process.
What are the performance results of different graph types in Uber Poet?
The performance tests revealed that the big small module structure is slower compared to many small modules. Swift 4.0 also improves build times for the big small architecture, while batch mode builds comparably to whole module optimization in Xcode 10.
What types of graphs can be generated using Uber Poet?
Uber Poet supports various graph types including flat, layered, big small flat, and big small layered graphs. Each type has distinct characteristics regarding module dependencies and sizes, which impact build performance.
Key Statistics & Figures
Swift build times for Uber's rider app
5 to 10 minutes
This is a significant improvement from previous build times of 30 to 45 minutes.
Percentage slowdown of batch mode in Swift 4.0
25 percent
This slowdown occurs when batch mode is applied to all modules in Uber's current architecture.
Technologies & Tools
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Programming Language
Swift
Used for developing Uber's applications and testing build performance.
Development Environment
Xcode
Required for building and testing Swift applications.
Build System
Buck
Used to generate project files and build the mock applications created by Uber Poet.
Key Actionable Insights
1Utilize Uber Poet to test new versions of the Swift compiler without migrating your entire codebase.This allows developers to evaluate the performance of new compiler features in a controlled environment, ensuring that existing functionality remains intact while exploring improvements.
2Leverage Uber Poet to project future build times as your application scales.By simulating various module architectures, you can identify potential bottlenecks and optimize your code structure before they become problematic.
3Generate mock code for testing other source code tools using Uber Poet.This can streamline the testing process by providing realistic scenarios without the overhead of maintaining separate mock implementations.
Common Pitfalls
1
Assuming that larger modules will always lead to faster build times.
The tests showed that smaller modules can lead to better performance due to fewer dependencies, which is a common misconception in module architecture.
Related Concepts
Swift Build Optimization Techniques
Dependency Injection In Swift
Performance Benchmarking Tools