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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.
30 lines
1.7 KiB
Diff
30 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sat, 6 Apr 2019 10:16:48 -0400
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Subject: [PATCH] Optimize Captured BlockEntity Lookup
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upstream was doing a containsKey/get pattern, and always doing it at that.
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that scenario is only even valid if were in the middle of a block place.
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Optimize to check if the captured list even has values in it, and also to
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just do a get call since the value can never be null.
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diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
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index 4c4449f7dee8695a362f83b9356e5754244fff18..60b04a16c6cb0a7109bda5c16e23c1d56ab7afad 100644
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--- a/src/main/java/net/minecraft/world/level/Level.java
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+++ b/src/main/java/net/minecraft/world/level/Level.java
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@@ -912,9 +912,12 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
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@Nullable
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public BlockEntity getBlockEntity(BlockPos blockposition, boolean validate) {
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- if (this.capturedTileEntities.containsKey(blockposition)) {
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- return this.capturedTileEntities.get(blockposition);
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+ // Paper start - Perf: Optimize capturedTileEntities lookup
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+ net.minecraft.world.level.block.entity.BlockEntity blockEntity;
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+ if (!this.capturedTileEntities.isEmpty() && (blockEntity = this.capturedTileEntities.get(blockposition)) != null) {
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+ return blockEntity;
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}
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+ // Paper end - Perf: Optimize capturedTileEntities lookup
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// CraftBukkit end
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return this.isOutsideBuildHeight(blockposition) ? null : (!this.isClientSide && Thread.currentThread() != this.thread ? null : this.getChunkAt(blockposition).getBlockEntity(blockposition, LevelChunk.EntityCreationType.IMMEDIATE));
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}
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