More stabilization

Author: triceo

.github/workflows/performance_score_director.yml

@@ -70,9 +70,9 @@ jobs:
         working-directory: ./timefold-solver-benchmarks
         shell: bash
         run: |
-          echo "forks=15" > scoredirector-benchmark.properties
+          echo "forks=10" > scoredirector-benchmark.properties
           echo "warmup_iterations=5" >> scoredirector-benchmark.properties
-          echo "measurement_iterations=10" >> scoredirector-benchmark.properties
+          echo "measurement_iterations=15" >> scoredirector-benchmark.properties
           echo "score_director_type=cs" >> scoredirector-benchmark.properties
           echo "example=${{ matrix.example }}" >> scoredirector-benchmark.properties
           cat scoredirector-benchmark.properties

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

@@ -178,7 +178,7 @@ public ChainedOptionsBuilder getBaseJmhConfig(C configuration) {
                 .forks(configuration.getForkCount())
                 .warmupIterations(configuration.getWarmupIterations())
                 .measurementIterations(configuration.getMeasurementIterations())
-                .jvmArgs("-XX:+UseZGC", "-Xmx4g") // Stable, predictable GC pause times.
+                .jvmArgs("-XX:+UseParallelGC", "-Xmx2g") // Stable, predictable GC pause times.
                 .result(resultsDirectory.resolve("results.json").toAbsolutePath().toString())
                 .resultFormat(ResultFormatType.JSON)
                 .shouldDoGC(true);