[swift-dev] Reduce app startup time by combining swift-libs
alblue at apple.com
Mon Feb 20 05:35:55 CST 2017
> On 17 Feb 2017, at 21:58, Michel Loenngren via swift-dev <swift-dev at swift.org> wrote:
> When starting an app that includes swift these libs are being loaded:
> which adds considerable delay to our app startup time (compared to running a pure objective-c codebase). Is anybody aware of a way to reduce startup by combining these libs into a single lib for faster load time?
At the moment, these are provided as individual libraries because they are built as separate libraries on the command line. It's possible to build a static version of the core library with swiftc -static-stdlib on Darwin (there are still work in progress items for Linux and Foundation).
However, note that the majority of the libraries that you list are also used in a pure objective-c codebase; for example, running otool -L on Mail.app gives:
(Dispatch is embedded in libSystem on Darwin)
So the libraries you load are the same ones (in effect) to the ones used by your Objective-C application, in all likelihood. The difference is probably in the way that the libraries are set up and the dispatch once code is executed - which are necessary steps in bringing the Swift runtime up for your application.
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