| 22 | #include <QObject> |
| 23 | |
| 24 | QStringList JavaPerformance::getBaseOptimizationArgs(const JavaVersion& version, const GarbageCollectorPreset preset) |
| 25 | { |
| 26 | QStringList args; |
| 27 | |
| 28 | // Mojang default |
| 29 | // JEPs: https://openjdk.org/jeps/450, https://openjdk.org/jeps/519 |
| 30 | if (version.major() >= 24) { |
| 31 | if (version.major() == 24) { |
| 32 | args << "-XX:+UnlockExperimentalVMOptions"; |
| 33 | } |
| 34 | args << "-XX:+UseCompactObjectHeaders"; |
| 35 | } |
| 36 | |
| 37 | // Mojang default |
| 38 | // Since Java 8 for G1GC |
| 39 | // Since Java 18 for ZGC |
| 40 | if ((version.major() >= 8 && preset == GarbageCollectorPreset::G1GC) || version.major() >= 18) { |
| 41 | args << "-XX:+UseStringDeduplication"; |
| 42 | } |
| 43 | |
| 44 | // Enables parallel GC reference processing |
| 45 | // https://bugs.openjdk.org/browse/JDK-8359925 |
| 46 | // Since Java 6 |
| 47 | if (version.major() <= 25) { |
| 48 | args << "-XX:+ParallelRefProcEnabled"; |
| 49 | } |
| 50 | |
| 51 | // Mojang default |
| 52 | // Since Java 6 (minimum supported by us is Java 7) |
| 53 | args << "-XX:+AlwaysPreTouch"; |
| 54 | |
| 55 | // Prevents GC from doing writing performance data to filesystem |
| 56 | // https://www.evanjones.ca/jvm-mmap-pause.html |
| 57 | // Since Java 6 |
| 58 | args << "-XX:+PerfDisableSharedMem"; |
| 59 | |
| 60 | return args; |
| 61 | } |
| 62 | |
| 63 | QStringList JavaPerformance::getGarbageCollectorArgs(const JavaVersion& version, const GarbageCollectorPreset preset) |
| 64 | { |