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Add Graal recommendation to contributing guide

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Christopher Batey 2018-11-27 08:38:12 +00:00
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CONTRIBUTING.md
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@ -152,6 +152,13 @@ multi-jvm:testOnly akka.cluster.SunnyWeather
Akka has not been compiled or tested with `-optimize` Scala compiler flag. (In sbt, you can specify compiler options in the `scalacOptions` key.) Akka has not been compiled or tested with `-optimize` Scala compiler flag. (In sbt, you can specify compiler options in the `scalacOptions` key.)
Strange behavior has been reported by users that have tried it. Strange behavior has been reported by users that have tried it.
### Compiling with Graal JIT
Akka, like most Scala projects, compiles faster with the Graal JIT enabled. The easiest way to use it for compiling Akka is to:
* Use a JDK > 10
* Use the following JVM options for SBT e.g. by adding them to the `SBT_OPTS` environment variable: `-XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseJVMCICompiler`
## The `validatePullRequest` task ## The `validatePullRequest` task
The Akka build includes a special task called `validatePullRequest` which investigates the changes made as well as dirty The Akka build includes a special task called `validatePullRequest` which investigates the changes made as well as dirty