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All Projects → ifndefgt → Structvsclassperformance

ifndefgt / Structvsclassperformance

Licence: mit
POC for my Medium article

Programming Languages

swift
15916 projects

Labels

performancepocclassstruct

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Struct vs Class Performance

This is a POC for my Medium article Stop Using Structs!! which compares performance characteristics of structs and classes, with a view to show where structs are misused and contain other reference types.

Warning

The article and POC was published for Swift version 4.0 and this POC is valid for Swift 4.0 and -very likely- previous versions. But with Swift 4.1 and 4.2 Apple changed calling convention and ownership model and these changes directly effect language's performance characteristics.

Therefore the results of this POC may vary and is not perfectly valid for Swift versions after 4.0.

Results

I tested each configuration with 100 iterations, results are averages in milliseconds, smaller is better :)

Optimization Level Class Struct Ratio
-Onone (unoptimized) 47926 89411 ~1.86x
-O (single file optimization) 5981 16503 ~2.76x
-O -whole-module-optimization 372 24809 ~67x

Requirements

  • Xcode 9.0
  • Swift 4.0

Running

xcrun -sdk macosx swiftc -O -whole-module-optimization StructvsClassPerformance.swift
./StructvsClassPerformance

License

Licensed under the terms of the MIT license. See the LICENSE file.

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