Mutator-Driven Object Placement using Load Barriers

This repository contains the implementation of LR-Z used in the paper Mutator-Driven Object Placement using Load Barriers.

Comparing patches

lr-z contains the main contribution.

• LR-Z patch ... or git diff jdk lr-z
• Telemetry patch for ZGC ... or git diff jdk jdk_telemetry
• Telemetry patch for LR-Z ... or git diff lr-z lr-z_telemetry

Note that lr-z also contains an extraction of the best configuration from HCSGC. Use the following flags to activate different GCs:

• ZGC -XX:+UseZGC
• HCSGC -XX:+UseZGC -XX:+UseRelocateAllSmallPages -XX:+UseLazyRelocate
• LR-Z -XX:+UseZGC -XX:+UsePartialEvacuation -XX:+UseLazyRelocate

All GCs except HCSGC/LR-Z were evaluated using JDK 15+36 which can be found in the branch jdk.

Notes on building

To configure building you should run (after checking out a branch) bash configure --with-boot-jdk=/home/user/jdk/candidates/jdk-15.0.2 --with-extra-cxxflags='-std=c++11'. To build you run make CONF=release.

boot-jdk needs to be version 14 or 15 and can be downloaded from https://jdk.java.net/archive/. Note that we only support Linux/x86.