Rewrote my Ruby program in Kotlin native, ended up...

# kotlin-native

[GauthierPLM]

Rewrote my Ruby program in Kotlin native, ended up with a 100 time slower program ... 😕
The parts which make is slower :
- spliting a file of 1000 lines, and then spliting each line in 1000 elements
- for each on each splited line
- trim each string (won 10s by removing that)
- getting a value in a collection seems slow too

[olonho]

Did you use optimized build? -opt flag

[olonho]

Also if your program runs on JVM using JRuby, it’s not entirely unexpected, as memory allocations optimizations in K/N are not yet merged

[GauthierPLM]

The Ruby program run in native Ruby, not JVM.
What I wanted to show is just how much time it takes compared to another language. I guess Kotlin on JVM would be much faster. I’ll try to port it now, code is short 🙂

[GauthierPLM]

So, same code in Kotlin/JVM takes 2.2 seconds instead of 2m45 for Kotlin/native (without -opt flag).

[GauthierPLM]

I am looking how to add this flag now

[GauthierPLM]

Okay, here is the comparison for exact same code (except IO):

Kotlin/Native :

real 2m42.136s
user 2m40.610s
sys 0m0.752s

Kotlin/JVM :

real 0m0.800s
user 0m1.816s
sys 0m0.192s

[olonho]

Without seeing a program it is hard to make conclusions. What are -opt results?

[olonho]

Note, that without -opt any speed measurements are pretty much useless. Please create an issue on https://github.com/JetBrains/kotlin-native/issues with your code attached, so that we have it for references.

[GauthierPLM]

it was done with opt on kotlin/native

[GauthierPLM]

I’ll attach the projects

[GauthierPLM]

https://github.com/JetBrains/kotlin-native/issues/1087

[olonho]

thanks, we are investigating this problem