`javac` compiles hello world program in 500ms, is ...

# announcements

[Vishal Rana]

javac compiles hello world program in 500ms, is there a reason why does kotlinc takes 3 s? Is there any way I can improve this? I heard about kotlinc daemon but could not find any documents to get started.

[groostav]

are you using gradle?

[Vishal Rana]

I have, and the performance is at par with java - I know it runs a daemon. Can I get the same performance with kotlinc?

[gildor]

kotlin daemon is used only for Gradle

[Vishal Rana]

@gildor Do you know how come https://try.kotlinlang.org is so fast in compiling and running the code?

[gildor]

It uses compiler under the hood as a library. It's much faster because it's not starting each time and uses warmed JVM
Do you have some particular use case?

[Vishal Rana]

I am implementing online editor. So far I have used gradle and getting 1.1 sec over http.

[Vishal Rana]

But gradle itself adds about .7 sec.

[gildor]

You can use exactly the same code, it’s open source
https://github.com/JetBrains/kotlin-web-demo

[Vishal Rana]

Wow thanks for the link.

[gildor]

So far I have used gradle

If you use Gradle you probably should use Gradle tooling API and connect to gradle directly, not just run it from command line, otherwise you pay price of configuration time on every launch even with daemon

[gildor]

https://play.kotlinlang.org uses the same code, but just as web service, with own UI

[Vishal Rana]

Informational. Appreciate it. The only problem is that the server is in golang.

[gildor]

which one?

[Vishal Rana]

Does gradle provides rpc?

[Vishal Rana]

The service I am writing.

[gildor]

Tooling API is JVM

[gildor]

anyway, you don;t need it, because everything is already part of kotlin-web-demo project

[gildor]

you just run it and send http requests to compile and invoke your code

[Vishal Rana]

Got it