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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.
34 lines
1.8 KiB
Diff
34 lines
1.8 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: Mon, 21 Dec 2020 11:01:42 -0500
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Subject: [PATCH] Optimize Dynamic#get Missing Keys
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get was calling toString() on every NBT object that was ever asked for an optional
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key from the object to build a string for the error text.
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When done on large NBT objects, this was using a ton of computation time building the
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JSON representation of the NBT object.
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Now we will just skip the value when 99.9999% of the time the text is never even printed.
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diff --git a/src/main/java/com/mojang/serialization/Dynamic.java b/src/main/java/com/mojang/serialization/Dynamic.java
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index d73bb05272d69471644b28f8c704a3bfceca72c2..8b4ea53b891bb7a5ceb791c4afaaf33814d9b6f6 100644
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--- a/src/main/java/com/mojang/serialization/Dynamic.java
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+++ b/src/main/java/com/mojang/serialization/Dynamic.java
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@@ -19,6 +19,7 @@ import java.util.stream.Stream;
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@SuppressWarnings("unused")
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public class Dynamic<T> extends DynamicLike<T> {
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+ private static final boolean DEBUG_MISSING_KEYS = Boolean.getBoolean("Paper.debugDynamicMissingKeys"); // Paper - Perf: Skip toString on values like NBT
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private final T value;
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public Dynamic(final DynamicOps<T> ops) {
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@@ -120,7 +121,7 @@ public class Dynamic<T> extends DynamicLike<T> {
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return new OptionalDynamic<>(ops, ops.getMap(value).flatMap(m -> {
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final T value = m.get(key);
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if (value == null) {
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- return DataResult.error(() -> "key missing: " + key + " in " + this.value);
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+ return DataResult.error(() -> DEBUG_MISSING_KEYS ? "key missing: " + key + " in " + this.value : "key missing: " + key); // Paper - Perf: Skip toString on values like NBT
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}
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return DataResult.success(new Dynamic<>(ops, value));
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}));
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