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string-performance

Set of benchmarks for the "Enough java.lang.String to Hang Ourselves ..." talk

Build

JDK 8 or later is required to build the code. Make sure that your JAVA_HOME points to proper JDK release and the run the following command:

./gradlew shadowJar

This will produce a single jar file containing benchmarks: build/libs/string-performance-benchmarks-jdk-$javaVersion.jar, where $javaVersion will be replaced with the Java version used to build the jar (e.g. string-performance-benchmarks-jdk-11.jar when built using Java 11).

Run

First build the benchmark jars as described above and then execute them using the following command:

java -jar <jar file>

For example this is how to test JDK 11 code using extra JVM flags to be able to compare JDK 8 with JDK 11:

java -jar build/libs/string-performance-benchmarks-11.jar -jvmArgs '-Xmx8g -XX:-TieredCompilation -XX:+UseParallelGC'