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Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
39 lines
1.9 KiB
Diff
39 lines
1.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: giacomo <32515303+giacomozama@users.noreply.github.com>
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Date: Sat, 10 Oct 2020 12:15:33 +0200
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Subject: [PATCH] Fix bell block entity memory leak
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BellBlockEntity has a list of entities (entitiesAtRing) that was not being cleared at the right time, causing leaks whenever a bell would be rung near a crowd of entities.
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diff --git a/src/main/java/net/minecraft/world/level/block/entity/BellBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BellBlockEntity.java
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index e1adfd10a2f67687b7123d20d31eb7d059a3e1e3..86dac3f82da065bf79d94da9df192f51ce4665e2 100644
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--- a/src/main/java/net/minecraft/world/level/block/entity/BellBlockEntity.java
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+++ b/src/main/java/net/minecraft/world/level/block/entity/BellBlockEntity.java
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@@ -63,6 +63,11 @@ public class BellBlockEntity extends BlockEntity {
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if (blockEntity.ticks >= 50) {
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blockEntity.shaking = false;
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+ // Paper start - Fix bell block entity memory leak
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+ if (!blockEntity.resonating) {
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+ blockEntity.nearbyEntities.clear();
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+ }
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+ // Paper end - Fix bell block entity memory leak
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blockEntity.ticks = 0;
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}
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@@ -76,6 +81,7 @@ public class BellBlockEntity extends BlockEntity {
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++blockEntity.resonationTicks;
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} else {
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bellEffect.run(world, pos, blockEntity.nearbyEntities);
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+ blockEntity.nearbyEntities.clear(); // Paper - Fix bell block entity memory leak
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blockEntity.resonating = false;
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}
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}
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@@ -125,6 +131,7 @@ public class BellBlockEntity extends BlockEntity {
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}
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}
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+ this.nearbyEntities.removeIf(e -> !e.isAlive()); // Paper - Fix bell block entity memory leak
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}
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private static boolean areRaidersNearby(BlockPos pos, List<LivingEntity> hearingEntities) {
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