1. Install Gradle profiler
2. Run ./gradlew createBuild
3. Follow the instructions

./gradlew createBuild generates a medium size Gradle build (120 modules, 121 gradle.kts scripts) under build/profile.

Gradle profiler runs the build a few times, changing the ABI of a Kotlin class under buildSrc before each run to ensure all Kotlin scripts need to be recompiled. At the end it should generate a flamegraph under ./build/flamegraph.

The interface between Gradle and the Kotlin script compiler is implemented in KotlinCompiler.kt.

It is worth noting how KOTLIN_COMPILER_ENVIRONMENT_KEEPALIVE_PROPERTY system property is being used to workaround KT-35394 here. This has a very negative impact on performance, it would be much better to keep the Kotlin compiler environment alive for the duration of the whole build and dispose of it during buildFinished. Is there some public or internal Kotlin compiler API we can use to accomplish that?