There's no reason why writing data to disk should be slower in Swift than in C/C++.
(For the name and location properties, I assume you want to save Strings, a sequence of characters or something rather than just the value of the UnsafePointer<UInt8>.) On Sat, Oct 1, 2016 at 11:22 PM, Игорь Никитин <devni...@icloud.com> wrote: > I got it. Thanks for your tips! > > 2 окт. 2016 г., в 0:13, Jens Persson <j...@bitcycle.com> написал(а): > > You could write some examples in both C and Swift in order to gain > experience in how to write your Swift code so that it will (probably) run > as fast as (or faster than) your corresponding C code. > > I've done this for a number of different performance critical things and > it is often possible to get the Swift version as fast as the C version. > > (If you find something that is not possible (or unnecessarily cumbersome) > to write as fast in Swift as in C, you could probably file a > bug/improvement on bugs.swift.org. I did this some time ago when I > noticed that Swift's optimizer missed an opportunity to unroll loops in a > certain situation and it turned out that a fix/optimizer-improvement was > already on its way.) > > You must of course profile/microbenchmark your code in some meaningful > way, setting all relevant compiler flags for both C and Swift, preventing > dead code elimination, measuring average or perhaps median times of lots of > tests, making sure what should and shouldn't be statically knowable, etc. > > In Swift you probably want -O -whole-module-optimization, and (rarely) you > might want/need to disable safety checks. > > /Jens > > > > On Sat, Oct 1, 2016 at 10:33 PM, Daniel Dunbar via swift-users < > swift-users@swift.org> wrote: > >> Yes, it is possible. Exactly how much use of Unsafe style idioms and >> other performance-focused "workarounds" it requires depends a lot on the >> code in question. Can you say more about your problem area? >> >> - Daniel >> >> > On Oct 1, 2016, at 1:30 PM, Игорь Никитин via swift-users < >> swift-users@swift.org> wrote: >> > >> > Hello! >> > Is it possible for Swift to be as fast as C when writing performance >> critical code? Of course if using C Standard Library for instead of >> Foundation (and so on) and getting rid of dynamic dispatch and reference >> types. >> > Or I need just to use C? >> > _______________________________________________ >> > swift-users mailing list >> > swift-users@swift.org >> > https://lists.swift.org/mailman/listinfo/swift-users >> >> _______________________________________________ >> swift-users mailing list >> swift-users@swift.org >> https://lists.swift.org/mailman/listinfo/swift-users >> > >
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