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Lazily track plugin scoreboards by default

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On servers with plugins that constantly churn through scoreboards, there is a risk of degraded GC performance due to the number of scoreboards held on by weak references. Most plugins don't even need the (vanilla) functionality that requires all plugin scoreboards to be tracked by the server. Instead, only track scoreboards when an objective is added with a non-dummy criteria.

This is a breaking change, however the change is a much more sensible default. In case this breaks your workflow you can always force all scoreboards to be tracked with settings.track-plugin-scoreboards in paper.yml.
This commit is contained in:
Andrew Steinborn 2020-10-03 04:47:01 -04:00
parent 0e942922ab
commit ac051139a8
1 changed files with 89 additions and 0 deletions
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Spigot-Server-Patches/Lazily-track-plugin-scoreboards-by-default.patch Normal file
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Andrew Steinborn <git@steinborn.me>
Date: Sat, 3 Oct 2020 04:15:09 -0400
Subject: [PATCH] Lazily track plugin scoreboards by default
On servers with plugins that constantly churn through scoreboards, there is a risk of
degraded GC performance due to the number of scoreboards held on by weak references.
Most plugins don't even need the (vanilla) functionality that requires all plugin
scoreboards to be tracked by the server. Instead, only track scoreboards when an
objective is added with a non-dummy criteria.
This is a breaking change, however the change is a much more sensible default. In case
this breaks your workflow you can always force all scoreboards to be tracked with
settings.track-plugin-scoreboards in paper.yml.
diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -0,0 +0,0 @@ public class PaperConfig {
private static void maxJoinsPerTick() {
maxJoinsPerTick = getInt("settings.max-joins-per-tick", 3);
}
+
+ public static boolean trackPluginScoreboards;
+ private static void trackPluginScoreboards() {
+ trackPluginScoreboards = getBoolean("settings.track-plugin-scoreboards", false);
+ }
}
diff --git a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboard.java b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboard.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboard.java
+++ b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboard.java
@@ -0,0 +0,0 @@ import org.bukkit.scoreboard.Team;
public final class CraftScoreboard implements org.bukkit.scoreboard.Scoreboard {
final Scoreboard board;
+ boolean registeredGlobally = false; // Paper
CraftScoreboard(Scoreboard board) {
this.board = board;
@@ -0,0 +0,0 @@ public final class CraftScoreboard implements org.bukkit.scoreboard.Scoreboard {
Validate.isTrue(board.getObjective(name) == null, "An objective of name '" + name + "' already exists");
CraftCriteria craftCriteria = CraftCriteria.getFromBukkit(criteria);
+ // Paper start
+ if (craftCriteria.criteria != net.minecraft.server.IScoreboardCriteria.DUMMY && !registeredGlobally) {
+ net.minecraft.server.MinecraftServer.getServer().server.getScoreboardManager().registerScoreboardForVanilla(this);
+ registeredGlobally = true;
+ }
+ // Paper end
ScoreboardObjective objective = board.registerObjective(name, craftCriteria.criteria, CraftChatMessage.fromStringOrNull(displayName), CraftScoreboardTranslations.fromBukkitRender(renderType));
return new CraftObjective(this, objective);
}
diff --git a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboardManager.java b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboardManager.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboardManager.java
+++ b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboardManager.java
@@ -0,0 +0,0 @@ public final class CraftScoreboardManager implements ScoreboardManager {
public CraftScoreboardManager(MinecraftServer minecraftserver, net.minecraft.server.Scoreboard scoreboardServer) {
mainScoreboard = new CraftScoreboard(scoreboardServer);
+ mainScoreboard.registeredGlobally = true; // Paper
server = minecraftserver;
scoreboards.add(mainScoreboard);
}
@@ -0,0 +0,0 @@ public final class CraftScoreboardManager implements ScoreboardManager {
public CraftScoreboard getNewScoreboard() {
org.spigotmc.AsyncCatcher.catchOp("scoreboard creation"); // Spigot
CraftScoreboard scoreboard = new CraftScoreboard(new ScoreboardServer(server));
+ // Paper start
+ if (com.destroystokyo.paper.PaperConfig.trackPluginScoreboards) {
+ scoreboard.registeredGlobally = true;
scoreboards.add(scoreboard);
+ }
+ // Paper end
return scoreboard;
}
+ // Paper start
+ public void registerScoreboardForVanilla(CraftScoreboard scoreboard) {
+ org.spigotmc.AsyncCatcher.catchOp("scoreboard registration");
+ scoreboards.add(scoreboard);
+ }
+ // Paper end
+
// CraftBukkit method
public CraftScoreboard getPlayerBoard(CraftPlayer player) {
CraftScoreboard board = playerBoards.get(player);