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c5a10665b8
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.
48 lines
2.1 KiB
Diff
48 lines
2.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Mon, 6 Apr 2020 18:35:09 -0700
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Subject: [PATCH] Reduce Either Optional allocation
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In order to get chunk values, we shouldn't need to create
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an optional each time.
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diff --git a/src/main/java/com/mojang/datafixers/util/Either.java b/src/main/java/com/mojang/datafixers/util/Either.java
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index 698ff6caf5924ce5c731254acd466c381c55c9b3..d54e617fc583ae7a045ebba8fde6bc5a486d73d5 100644
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--- a/src/main/java/com/mojang/datafixers/util/Either.java
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+++ b/src/main/java/com/mojang/datafixers/util/Either.java
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@@ -22,7 +22,7 @@ public abstract class Either<L, R> implements App<Either.Mu<R>, L> {
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}
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private static final class Left<L, R> extends Either<L, R> {
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- private final L value;
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+ private final L value; private Optional<L> valueOptional; // Paper - Perf: Reduce Either Optional allocation
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public Left(final L value) {
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this.value = value;
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@@ -51,7 +51,7 @@ public abstract class Either<L, R> implements App<Either.Mu<R>, L> {
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@Override
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public Optional<L> left() {
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- return Optional.of(value);
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+ return this.valueOptional == null ? this.valueOptional = Optional.of(this.value) : this.valueOptional; // Paper - Perf: Reduce Either Optional allocation
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}
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@Override
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@@ -83,7 +83,7 @@ public abstract class Either<L, R> implements App<Either.Mu<R>, L> {
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}
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private static final class Right<L, R> extends Either<L, R> {
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- private final R value;
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+ private final R value; private Optional<R> valueOptional; // Paper - Perf: Reduce Either Optional allocation
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public Right(final R value) {
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this.value = value;
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@@ -117,7 +117,7 @@ public abstract class Either<L, R> implements App<Either.Mu<R>, L> {
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@Override
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public Optional<R> right() {
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- return Optional.of(value);
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+ return this.valueOptional == null ? this.valueOptional = Optional.of(this.value) : this.valueOptional; // Paper - Perf: Reduce Either Optional allocation
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}
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@Override
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