https://github.com/bamboo/gradle-kotlin-dsl-profile

Profile Gradle Kotlin DSL script compilation
https://github.com/bamboo/gradle-kotlin-dsl-profile

Last synced: about 1 month ago
JSON representation

Profile Gradle Kotlin DSL script compilation

• Host: GitHub
• URL: https://github.com/bamboo/gradle-kotlin-dsl-profile
• Owner: bamboo
• Created: 2020-08-31T19:57:25.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2020-09-04T14:27:45.000Z (over 4 years ago)
• Last Synced: 2024-10-28T19:57:35.600Z (3 months ago)
• Language: Kotlin
• Size: 58.6 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

        
## Generate flamegraph for a Gradle Kotlin DSL build 

1. Install [Gradle profiler](https://github.com/gradle/gradle-profiler)

2. Run `./gradlew createBuild`

3. Follow the instructions

### How it works 

`./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](./build/flamegraph).

#### Improving the way Gradle interfaces with the Kotlin script compiler 

The interface between Gradle and the Kotlin script compiler is implemented in [KotlinCompiler.kt](https://github.com/gradle/gradle/blob/176e1c4818c68a01eb7aa7a248eee19a71414716/subprojects/kotlin-dsl/src/main/kotlin/org/gradle/kotlin/dsl/support/KotlinCompiler.kt#L88-L87).

It is worth noting how `KOTLIN_COMPILER_ENVIRONMENT_KEEPALIVE_PROPERTY` system property is being used to workaround [`KT-35394`](https://youtrack.jetbrains.com/issue/KT-35394) [here](https://github.com/gradle/gradle/blob/176e1c4818c68a01eb7aa7a248eee19a71414716/subprojects/kotlin-dsl/src/main/kotlin/org/gradle/kotlin/dsl/support/KotlinCompiler.kt#L375-L390). 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?