df28671800
### What changes were proposed in this pull request? This PR aims to specify the JDK8 default configurations `-XX:+UseParallelGC -XX:-UseDynamicNumberOfGCThreads` explicitly. As we see in this PR [here](https://github.com/apache/spark/pull/25966/files#diff-12b89b7ee67c63c2254b749c8f8d0694R10), this will make the comparison between JDK8 and JDK11 easier by removing a misleading regression. **NOTE THAT THESE JVM CONFS ARE ONLY FOR BENCHMARK COMPARISON, NOT FOR A PRODUCTION** ### Why are the changes needed? There exists many JVM-level changes between JDK8 and JDK11. For example, the followings are notable changes and it turns out that especially (1) and (2) shows a misleading regression in our micro-benchmark environment because our microbenchmark uses small VM memory. 1. [JEP 248: Make G1 the Default Garbage Collector](https://bugs.openjdk.java.net/browse/JDK-8073273) **JDK9+** 2. [Enable UseDynamicNumberOfGCThreads by default](https://bugs.openjdk.java.net/browse/JDK-8198547) **JDK11+** 3. [Change default value of HeapSizePerGCThread](https://bugs.openjdk.java.net/browse/JDK-8200417) **JDK11+** ### Does this PR introduce any user-facing change? No. ### How was this patch tested? This is a test-only JVM configuration change. Manually, run the benchmark. Closes #25966 from dongjoon-hyun/SPARK-29282. Authored-by: Dongjoon Hyun <dhyun@apple.com> Signed-off-by: Dongjoon Hyun <dhyun@apple.com> |
||
|---|---|---|
| .. | ||
| benchmarks | ||
| src | ||
| pom.xml | ||