Introducing Kotlin Build Reports

Starting with Kotlin 1.7.0, you can create build reports for Kotlin compiler tasks. Reports contain durations of different compilation phases and reasons why incremental compilation could not be used. This functionality is still Experimental, so the list of metrics may change.

Build reports are useful when you want to investigate issues with compiler tasks. For example, when a Gradle build takes too much time, and it’s quite difficult to understand the root cause of poor performance. Another example is when the compilation time of the same projects differs: sometimes it takes seconds, and sometimes minutes.

Kotlin build reports help examine problems more efficiently than Gradle build scans. Many engineers use them to investigate build performance, but the unit of granularity in Gradle scans is a single Gradle task.

The optimization process is quite creative. It’s often difficult to provide a ready cookbook, and you have to investigate each case separately. But sometimes, you can achieve good results with the following pipeline:

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