mirror of
https://github.com/PaperMC/Paper.git
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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.
207 lines
8.4 KiB
Diff
207 lines
8.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: William Blake Galbreath <Blake.Galbreath@GMail.com>
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Date: Sun, 5 Apr 2020 22:23:14 -0500
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Subject: [PATCH] Add tick times API and /mspt command
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diff --git a/src/main/java/io/papermc/paper/command/MSPTCommand.java b/src/main/java/io/papermc/paper/command/MSPTCommand.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..8b5293b0c696ef21d0101493ffa41b60bf0bc86b
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/command/MSPTCommand.java
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@@ -0,0 +1,102 @@
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+package io.papermc.paper.command;
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+
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+import net.kyori.adventure.text.Component;
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+import net.minecraft.server.MinecraftServer;
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+import org.bukkit.Location;
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+import org.bukkit.command.Command;
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+import org.bukkit.command.CommandSender;
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+
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+import java.text.DecimalFormat;
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+import java.util.ArrayList;
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+import java.util.Arrays;
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+import java.util.Collections;
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+import java.util.List;
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+import org.checkerframework.checker.nullness.qual.NonNull;
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+import org.checkerframework.framework.qual.DefaultQualifier;
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+
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+import static net.kyori.adventure.text.Component.text;
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+import static net.kyori.adventure.text.format.NamedTextColor.GOLD;
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+import static net.kyori.adventure.text.format.NamedTextColor.GRAY;
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+import static net.kyori.adventure.text.format.NamedTextColor.GREEN;
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+import static net.kyori.adventure.text.format.NamedTextColor.RED;
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+import static net.kyori.adventure.text.format.NamedTextColor.YELLOW;
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+
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+@DefaultQualifier(NonNull.class)
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+public final class MSPTCommand extends Command {
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+ private static final DecimalFormat DF = new DecimalFormat("########0.0");
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+ private static final Component SLASH = text("/");
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+
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+ public MSPTCommand(final String name) {
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+ super(name);
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+ this.description = "View server tick times";
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+ this.usageMessage = "/mspt";
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+ this.setPermission("bukkit.command.mspt");
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+ }
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+
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+ @Override
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+ public List<String> tabComplete(CommandSender sender, String alias, String[] args, Location location) throws IllegalArgumentException {
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+ return Collections.emptyList();
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+ }
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+
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+ @Override
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+ public boolean execute(CommandSender sender, String commandLabel, String[] args) {
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+ if (!testPermission(sender)) return true;
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+
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+ MinecraftServer server = MinecraftServer.getServer();
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+
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+ List<Component> times = new ArrayList<>();
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+ times.addAll(eval(server.tickTimes5s.getTimes()));
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+ times.addAll(eval(server.tickTimes10s.getTimes()));
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+ times.addAll(eval(server.tickTimes60s.getTimes()));
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+
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+ sender.sendMessage(text().content("Server tick times ").color(GOLD)
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+ .append(text().color(YELLOW)
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+ .append(
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+ text("("),
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+ text("avg", GRAY),
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+ text("/"),
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+ text("min", GRAY),
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+ text("/"),
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+ text("max", GRAY),
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+ text(")")
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+ )
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+ ).append(
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+ text(" from last 5s"),
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+ text(",", GRAY),
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+ text(" 10s"),
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+ text(",", GRAY),
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+ text(" 1m"),
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+ text(":", YELLOW)
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+ )
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+ );
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+ sender.sendMessage(text().content("◴ ").color(GOLD)
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+ .append(text().color(GRAY)
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+ .append(
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+ times.get(0), SLASH, times.get(1), SLASH, times.get(2), text(", ", YELLOW),
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+ times.get(3), SLASH, times.get(4), SLASH, times.get(5), text(", ", YELLOW),
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+ times.get(6), SLASH, times.get(7), SLASH, times.get(8)
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+ )
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+ )
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+ );
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+ return true;
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+ }
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+
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+ private static List<Component> eval(long[] times) {
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+ long min = Integer.MAX_VALUE;
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+ long max = 0L;
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+ long total = 0L;
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+ for (long value : times) {
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+ if (value > 0L && value < min) min = value;
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+ if (value > max) max = value;
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+ total += value;
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+ }
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+ double avgD = ((double) total / (double) times.length) * 1.0E-6D;
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+ double minD = ((double) min) * 1.0E-6D;
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+ double maxD = ((double) max) * 1.0E-6D;
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+ return Arrays.asList(getColor(avgD), getColor(minD), getColor(maxD));
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+ }
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+
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+ private static Component getColor(double avg) {
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+ return text(DF.format(avg), avg >= 50 ? RED : avg >= 40 ? YELLOW : GREEN);
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+ }
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+}
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diff --git a/src/main/java/io/papermc/paper/command/PaperCommands.java b/src/main/java/io/papermc/paper/command/PaperCommands.java
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index 72f2e81b9905a0d57ed8e2a88578f62d5235c456..7b58b2d6297800c2dcdbf7539e5ab8e7703f39f1 100644
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--- a/src/main/java/io/papermc/paper/command/PaperCommands.java
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+++ b/src/main/java/io/papermc/paper/command/PaperCommands.java
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@@ -18,6 +18,7 @@ public final class PaperCommands {
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static {
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COMMANDS.put("paper", new PaperCommand("paper"));
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COMMANDS.put("callback", new CallbackCommand("callback"));
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+ COMMANDS.put("mspt", new MSPTCommand("mspt"));
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}
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public static void registerCommands(final MinecraftServer server) {
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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 ddc3da84c5a55d2cd977fcdb18121351606a6b3c..53bb62c1dcb487be915759d22e06aea80be54f36 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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@@ -258,6 +258,11 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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private int playerIdleTimeout;
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private final long[] tickTimesNanos;
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private long aggregatedTickTimesNanos;
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+ // Paper start - Add tick times API and /mspt command
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+ public final TickTimes tickTimes5s = new TickTimes(100);
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+ public final TickTimes tickTimes10s = new TickTimes(200);
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+ public final TickTimes tickTimes60s = new TickTimes(1200);
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+ // Paper end - Add tick times API and /mspt command
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@Nullable
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private KeyPair keyPair;
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@Nullable
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@@ -1472,6 +1477,11 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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this.aggregatedTickTimesNanos += j;
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this.tickTimesNanos[k] = j;
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this.smoothedTickTimeMillis = this.smoothedTickTimeMillis * 0.8F + (float) j / (float) TimeUtil.NANOSECONDS_PER_MILLISECOND * 0.19999999F;
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+ // Paper start - Add tick times API and /mspt command
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+ this.tickTimes5s.add(this.tickCount, j);
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+ this.tickTimes10s.add(this.tickCount, j);
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+ this.tickTimes60s.add(this.tickCount, j);
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+ // Paper end - Add tick times API and /mspt command
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this.logTickMethodTime(i);
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this.profiler.pop();
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org.spigotmc.WatchdogThread.tick(); // Spigot
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@@ -2855,4 +2865,30 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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public static record ServerResourcePackInfo(UUID id, String url, String hash, boolean isRequired, @Nullable Component prompt) {
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}
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+
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+ // Paper start - Add tick times API and /mspt command
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+ public static class TickTimes {
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+ private final long[] times;
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+
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+ public TickTimes(int length) {
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+ times = new long[length];
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+ }
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+
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+ void add(int index, long time) {
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+ times[index % times.length] = time;
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+ }
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+
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+ public long[] getTimes() {
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+ return times.clone();
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+ }
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+
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+ public double getAverage() {
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+ long total = 0L;
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+ for (long value : times) {
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+ total += value;
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+ }
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+ return ((double) total / (double) times.length) * 1.0E-6D;
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+ }
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+ }
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+ // Paper end - Add tick times API and /mspt command
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}
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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index ae4e3c137498ff390c8cae7315c7ebfe125efc35..55b11cb574d1fd634b4f445a0605249a296c6779 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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@@ -2686,6 +2686,16 @@ public final class CraftServer implements Server {
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return CraftMagicNumbers.INSTANCE;
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}
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+ @Override
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+ public long[] getTickTimes() {
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+ return this.getServer().tickTimes5s.getTimes();
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+ }
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+
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+ @Override
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+ public double getAverageTickTime() {
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+ return this.getServer().tickTimes5s.getAverage();
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+ }
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+
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// Spigot start
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private final org.bukkit.Server.Spigot spigot = new org.bukkit.Server.Spigot()
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{
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