Use ZGC to attempt to stabilize

Author: triceo

.github/workflows/performance_score_director.yml

@@ -121,7 +121,7 @@ jobs:
       - name: Phase 2 - Run the new configuration
         working-directory: ./timefold-solver-benchmarks
         env:
-          RUN_ID: ${{ github.event.inputs.baseline }}
+          RUN_ID: ${{ github.event.inputs.branch }}
         shell: bash
         run: |
           ./run-scoredirector.sh

src/main/java/ai/timefold/solver/benchmarks/micro/common/AbstractMain.java

@@ -178,6 +178,7 @@ public ChainedOptionsBuilder getBaseJmhConfig(C configuration) {
                 .forks(configuration.getForkCount())
                 .warmupIterations(configuration.getWarmupIterations())
                 .measurementIterations(configuration.getMeasurementIterations())
+                .jvmArgs("-XX:+UseZGC") // Minimize GC pause times.
                 .result(resultsDirectory.resolve("results.json").toAbsolutePath().toString())
                 .resultFormat(ResultFormatType.JSON)
                 .shouldDoGC(true);