[swift-dev] Performance degradation with 3.0.1(String comparison)

Michael Gottesman mgottesman at apple.com
Sun Nov 6 15:11:25 CST 2016

> On Nov 3, 2016, at 11:07 PM, Pushkar N Kulkarni via swift-dev <swift-dev at swift.org> wrote:
> Hello,
> A colleague of mine who's doing performance testing with some server-side Swift frameworks like Kitura, Perfect and Zewo found a 15-20% degradation with a simple "Hello World" benchmark, with the 3.0.1 previews on Linux. Analysis revealed it is related to the disabling of an optimisation around String comparison for Swift runtimes - this commit - apple/swift at ef974af <https://github.com/apple/swift/commit/ef974af339996f63c72d54ec7ef53b625e5a1a76>
> Do we have a plan to reimplement this optimisation for Swift runtimes in the future? Any more information about this would be highly appreciated. 

Can you please provide a benchmark in a pull request that shows the performance degradation?


> Thank you!
> Pushkar N Kulkarni,
> IBM Runtimes
> Simplicity is prerequisite for reliability - Edsger W. Dijkstra
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