Some ballpark figures on compilation times with Ko...

# kotlin-native

[napperley]

Some ballpark figures on compilation times with Kotlin 1.3.70 on a Kotlin Native project ( https://gitlab.com/napperley/ncurses-hello ) targeting linuxX64, which uses a statically linked C library (ncurses):
• Fresh Compile (from a clean build): 21s 648ms (around 10s faster than Kotlin 1.3.61)
• Compile From Incremental Change (of one line): 5s 750ms (around 25s faster than Kotlin 1.3.61)
Compilation was done on a laptop (ThinkPad T480) that uses a Intel i5-8250U 8th Gen (Kaby Lake) CPU (4 cores, 8 hyper threads), and a Samsung 860 Evo SSD.

[darkmoon_uk]

Great, this implies not only faster general compilation, but that incremental compilation is 'working at all' in Kotlin/Native 👏 Certainly in K/N 1.3.61 my iOS Framework compiles seemed to be full length, every time (particularly painful when only compiling a cross project K/MP library dependency for the sake of an Android parent project!).

[napperley]

Note that I did the incremental compilation test only twice with both results producing around the same number. So the results are probably not a fluke, although I will need to do the test two more times to confirm.

[napperley]

Below are the incremental compilation test results (after four runs):
• 6s 275ms
• 5s 344ms
• 4s 974ms
• 4s 199ms
Average Incremental Compilation Time: 5s 198ms

[napperley]

Definitely looks like the Kotlin Native compiler supports incremental compilation simple smile , at least with the linuxX64 target. There may be some other targets supported for incremental compilation.

[sergey.bogolepov]

We don’t support incremental compilation :)
The reason for these number is Gradle compiler daemon.

[napperley]

Did look like incremental compilation, although you are right. Can easily throw the numbers off when the Gradle compiler daemon needs to warm up.

[napperley]

Regardless of which way a person looks at the numbers the compilation speed is a significant improvement compared to the previous Kotlin version. However there is still a long way to go to have compilation times that are short enough to make software prototyping using the Kotlin Native compiler, and Gradle feasible.

[sergey.bogolepov]

Sure, we continue to work on making Native compiler faster :)