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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.
42 lines
2.7 KiB
Diff
42 lines
2.7 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: Fri, 2 Nov 2018 23:11:51 -0400
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Subject: [PATCH] Optimize World Time Updates
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Splits time updates into incremental updates as well as does
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the updates per world, so that we can re-use the same packet
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object for every player unless they have per-player time enabled.
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diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
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index f3f3f80f14bc1df13b80033aa143fcccab6f3a31..699191356a9d873fa6bbe04ea3e5db91eb2db41d 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
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+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -1560,12 +1560,24 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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MinecraftTimings.timeUpdateTimer.startTiming(); // Spigot // Paper
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// Send time updates to everyone, it will get the right time from the world the player is in.
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- if (this.tickCount % 20 == 0) {
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- for (int i = 0; i < this.getPlayerList().players.size(); ++i) {
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- ServerPlayer entityplayer = (ServerPlayer) this.getPlayerList().players.get(i);
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- entityplayer.connection.send(new ClientboundSetTimePacket(entityplayer.level().getGameTime(), entityplayer.getPlayerTime(), entityplayer.level().getGameRules().getBoolean(GameRules.RULE_DAYLIGHT))); // Add support for per player time
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+ // Paper start - Perf: Optimize time updates
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+ for (final ServerLevel level : this.getAllLevels()) {
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+ final boolean doDaylight = level.getGameRules().getBoolean(GameRules.RULE_DAYLIGHT);
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+ final long dayTime = level.getDayTime();
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+ long worldTime = level.getGameTime();
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+ final ClientboundSetTimePacket worldPacket = new ClientboundSetTimePacket(worldTime, dayTime, doDaylight);
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+ for (Player entityhuman : level.players()) {
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+ if (!(entityhuman instanceof ServerPlayer) || (tickCount + entityhuman.getId()) % 20 != 0) {
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+ continue;
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+ }
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+ ServerPlayer entityplayer = (ServerPlayer) entityhuman;
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+ long playerTime = entityplayer.getPlayerTime();
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+ ClientboundSetTimePacket packet = (playerTime == dayTime) ? worldPacket :
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+ new ClientboundSetTimePacket(worldTime, playerTime, doDaylight);
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+ entityplayer.connection.send(packet); // Add support for per player time
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}
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}
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+ // Paper end - Perf: Optimize time updates
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MinecraftTimings.timeUpdateTimer.stopTiming(); // Spigot // Paper
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while (iterator.hasNext()) {
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