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Code Issues
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Paper/patches/server/0023-Further-improve-server-tick-loop.patch
Nassim Jahnke 6483ecb8a2
Updated Upstream (Bukkit/CraftBukkit) 
Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
a6aba46f PR-1078: Improve Javadocs of Player#loadData() and Player#saveData()
1e2e6a18 SPIGOT-7946: API for server pause when empty seconds
54a36938 SPIGOT-7944, PR-1077: Allow nullable fields in DamageTypeTags

CraftBukkit Changes:
2702c5c8e SPIGOT-7946: API for server pause when empty seconds
485f910fc SPIGOT-7947: addPassenger doesn't work if the vehicle is a player
ecf3dff0e SPIGOT-7949: Registering a new scoreboard objective with an empty display name throws a NPE
9b048cc84 SPIGOT-7948: `Bukkit#dispatchCommand` uses the wrong `CommandListenerWrapper` for Players
7b44d4640 SPIGOT-7931: Fix sync in Anvil View when result item is taken
2024-11-09 17:01:35 +01:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 1 Mar 2016 23:09:29 -0600
Subject: [PATCH] Further improve server tick loop
Improves how the catchup buffer is handled, allowing it to roll both ways
increasing the effeciency of the thread sleep so it only will sleep once.
Also increases the buffer of the catchup to ensure server stays at 20 TPS unless extreme conditions
Previous implementation did not calculate TPS correctly.
Switch to a realistic rolling average and factor in std deviation as an extra reporting variable
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 3322865949fe5ddaab2dffc39260b75093f0f204..4a573e8b7cd90f65c190982662e92a11f79a1d3e 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -307,7 +307,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
public org.bukkit.craftbukkit.CraftServer server;
public OptionSet options;
public org.bukkit.command.ConsoleCommandSender console;
- public static int currentTick = (int) (System.currentTimeMillis() / 50);
+ public static int currentTick; // Paper - improve tick loop
public java.util.Queue<Runnable> processQueue = new java.util.concurrent.ConcurrentLinkedQueue<Runnable>();
public int autosavePeriod;
public Commands vanillaCommandDispatcher;
@@ -316,7 +316,8 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
// Spigot start
public static final int TPS = 20;
public static final int TICK_TIME = 1000000000 / MinecraftServer.TPS;
- private static final int SAMPLE_INTERVAL = 100;
+ private static final int SAMPLE_INTERVAL = 20; // Paper - improve server tick loop
+ @Deprecated(forRemoval = true) // Paper
public final double[] recentTps = new double[ 3 ];
// Spigot end
public final io.papermc.paper.configuration.PaperConfigurations paperConfigurations; // Paper - add paper configuration files
@@ -1033,6 +1034,57 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
{
return ( avg * exp ) + ( tps * ( 1 - exp ) );
}
+
+ // Paper start - Further improve server tick loop
+ private static final long SEC_IN_NANO = 1000000000;
+ private static final long MAX_CATCHUP_BUFFER = TICK_TIME * TPS * 60L;
+ private long lastTick = 0;
+ private long catchupTime = 0;
+ public final RollingAverage tps1 = new RollingAverage(60);
+ public final RollingAverage tps5 = new RollingAverage(60 * 5);
+ public final RollingAverage tps15 = new RollingAverage(60 * 15);
+
+ public static class RollingAverage {
+ private final int size;
+ private long time;
+ private java.math.BigDecimal total;
+ private int index = 0;
+ private final java.math.BigDecimal[] samples;
+ private final long[] times;
+
+ RollingAverage(int size) {
+ this.size = size;
+ this.time = size * SEC_IN_NANO;
+ this.total = dec(TPS).multiply(dec(SEC_IN_NANO)).multiply(dec(size));
+ this.samples = new java.math.BigDecimal[size];
+ this.times = new long[size];
+ for (int i = 0; i < size; i++) {
+ this.samples[i] = dec(TPS);
+ this.times[i] = SEC_IN_NANO;
+ }
+ }
+
+ private static java.math.BigDecimal dec(long t) {
+ return new java.math.BigDecimal(t);
+ }
+ public void add(java.math.BigDecimal x, long t) {
+ time -= times[index];
+ total = total.subtract(samples[index].multiply(dec(times[index])));
+ samples[index] = x;
+ times[index] = t;
+ time += t;
+ total = total.add(x.multiply(dec(t)));
+ if (++index == size) {
+ index = 0;
+ }
+ }
+
+ public double getAverage() {
+ return total.divide(dec(time), 30, java.math.RoundingMode.HALF_UP).doubleValue();
+ }
+ }
+ private static final java.math.BigDecimal TPS_BASE = new java.math.BigDecimal(1E9).multiply(new java.math.BigDecimal(SAMPLE_INTERVAL));
+ // Paper end
// Spigot End
protected void runServer() {
@@ -1047,7 +1099,10 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
// Spigot start
Arrays.fill( this.recentTps, 20 );
- long tickSection = Util.getMillis(), tickCount = 1;
+ // Paper start - further improve server tick loop
+ long tickSection = Util.getNanos();
+ long currentTime;
+ // Paper end - further improve server tick loop
while (this.running) {
long i;
@@ -1069,15 +1124,22 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
}
}
// Spigot start
- if ( tickCount++ % MinecraftServer.SAMPLE_INTERVAL == 0 )
- {
- long curTime = Util.getMillis();
- double currentTps = 1E3 / ( curTime - tickSection ) * MinecraftServer.SAMPLE_INTERVAL;
- this.recentTps[0] = MinecraftServer.calcTps( this.recentTps[0], 0.92, currentTps ); // 1/exp(5sec/1min)
- this.recentTps[1] = MinecraftServer.calcTps( this.recentTps[1], 0.9835, currentTps ); // 1/exp(5sec/5min)
- this.recentTps[2] = MinecraftServer.calcTps( this.recentTps[2], 0.9945, currentTps ); // 1/exp(5sec/15min)
- tickSection = curTime;
+ // Paper start - further improve server tick loop
+ currentTime = Util.getNanos();
+ if (++MinecraftServer.currentTick % MinecraftServer.SAMPLE_INTERVAL == 0) {
+ final long diff = currentTime - tickSection;
+ final java.math.BigDecimal currentTps = TPS_BASE.divide(new java.math.BigDecimal(diff), 30, java.math.RoundingMode.HALF_UP);
+ tps1.add(currentTps, diff);
+ tps5.add(currentTps, diff);
+ tps15.add(currentTps, diff);
+
+ // Backwards compat with bad plugins
+ this.recentTps[0] = tps1.getAverage();
+ this.recentTps[1] = tps5.getAverage();
+ this.recentTps[2] = tps15.getAverage();
+ tickSection = currentTime;
}
+ // Paper end - further improve server tick loop
// Spigot end
boolean flag = i == 0L;
@@ -1087,7 +1149,8 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
this.debugCommandProfiler = new MinecraftServer.TimeProfiler(Util.getNanos(), this.tickCount);
}
- MinecraftServer.currentTick = (int) (System.currentTimeMillis() / 50); // CraftBukkit
+ //MinecraftServer.currentTick = (int) (System.currentTimeMillis() / 50); // CraftBukkit // Paper - don't overwrite current tick time
+ lastTick = currentTime;
this.nextTickTimeNanos += i;
try {
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 5c54c5c525c86bb8037982435b8769ec2ca2c6cb..c9920b60a536f5735c61fd7ef154569f6b04c58b 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -2680,7 +2680,11 @@ public final class CraftServer implements Server {
@Override
public double[] getTPS() {
- return new double[]{0, 0, 0}; // TODO
+ return new double[] {
+ net.minecraft.server.MinecraftServer.getServer().tps1.getAverage(),
+ net.minecraft.server.MinecraftServer.getServer().tps5.getAverage(),
+ net.minecraft.server.MinecraftServer.getServer().tps15.getAverage()
+ };
}
// Paper start - adventure sounds
diff --git a/src/main/java/org/spigotmc/TicksPerSecondCommand.java b/src/main/java/org/spigotmc/TicksPerSecondCommand.java
index d9ec48be0fdd2bfea938aa29e36b0f6ffa839ab2..9eb2823cc8f83bad2626fc77578b0162d9ed5782 100644
--- a/src/main/java/org/spigotmc/TicksPerSecondCommand.java
+++ b/src/main/java/org/spigotmc/TicksPerSecondCommand.java
@@ -15,6 +15,12 @@ public class TicksPerSecondCommand extends Command
this.usageMessage = "/tps";
this.setPermission( "bukkit.command.tps" );
}
+ // Paper start
+ private static final net.kyori.adventure.text.Component WARN_MSG = net.kyori.adventure.text.Component.text()
+ .append(net.kyori.adventure.text.Component.text("Warning: ", net.kyori.adventure.text.format.NamedTextColor.RED))
+ .append(net.kyori.adventure.text.Component.text("Memory usage on modern garbage collectors is not a stable value and it is perfectly normal to see it reach max. Please do not pay it much attention.", net.kyori.adventure.text.format.NamedTextColor.GOLD))
+ .build();
+ // Paper end
@Override
public boolean execute(CommandSender sender, String currentAlias, String[] args)
@@ -24,22 +30,40 @@ public class TicksPerSecondCommand extends Command
return true;
}
- StringBuilder sb = new StringBuilder( ChatColor.GOLD + "TPS from last 1m, 5m, 15m: " );
- for ( double tps : MinecraftServer.getServer().recentTps )
- {
- sb.append( this.format( tps ) );
- sb.append( ", " );
+ // Paper start - Further improve tick handling
+ double[] tps = org.bukkit.Bukkit.getTPS();
+ net.kyori.adventure.text.Component[] tpsAvg = new net.kyori.adventure.text.Component[tps.length];
+
+ for ( int i = 0; i < tps.length; i++) {
+ tpsAvg[i] = TicksPerSecondCommand.format( tps[i] );
+ }
+
+ net.kyori.adventure.text.TextComponent.Builder builder = net.kyori.adventure.text.Component.text();
+ builder.append(net.kyori.adventure.text.Component.text("TPS from last 1m, 5m, 15m: ", net.kyori.adventure.text.format.NamedTextColor.GOLD));
+ builder.append(net.kyori.adventure.text.Component.join(net.kyori.adventure.text.JoinConfiguration.commas(true), tpsAvg));
+ sender.sendMessage(builder.asComponent());
+ if (args.length > 0 && args[0].equals("mem") && sender.hasPermission("bukkit.command.tpsmemory")) {
+ sender.sendMessage(net.kyori.adventure.text.Component.text()
+ .append(net.kyori.adventure.text.Component.text("Current Memory Usage: ", net.kyori.adventure.text.format.NamedTextColor.GOLD))
+ .append(net.kyori.adventure.text.Component.text(((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / (1024 * 1024)) + "/" + (Runtime.getRuntime().totalMemory() / (1024 * 1024)) + " mb (Max: " + (Runtime.getRuntime().maxMemory() / (1024 * 1024)) + " mb)", net.kyori.adventure.text.format.NamedTextColor.GREEN))
+ );
+ if (!this.hasShownMemoryWarning) {
+ sender.sendMessage(WARN_MSG);
+ this.hasShownMemoryWarning = true;
+ }
}
- sender.sendMessage( sb.substring( 0, sb.length() - 2 ) );
- sender.sendMessage(ChatColor.GOLD + "Current Memory Usage: " + ChatColor.GREEN + ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / (1024 * 1024)) + "/" + (Runtime.getRuntime().totalMemory() / (1024 * 1024)) + " mb (Max: "
- + (Runtime.getRuntime().maxMemory() / (1024 * 1024)) + " mb)");
+ // Paper end
return true;
}
- private String format(double tps)
+ private boolean hasShownMemoryWarning; // Paper
+ private static net.kyori.adventure.text.Component format(double tps) // Paper - Made static
{
- return ( ( tps > 18.0 ) ? ChatColor.GREEN : ( tps > 16.0 ) ? ChatColor.YELLOW : ChatColor.RED ).toString()
- + ( ( tps > 20.0 ) ? "*" : "" ) + Math.min( Math.round( tps * 100.0 ) / 100.0, 20.0 );
+ // Paper
+ net.kyori.adventure.text.format.TextColor color = ( ( tps > 18.0 ) ? net.kyori.adventure.text.format.NamedTextColor.GREEN : ( tps > 16.0 ) ? net.kyori.adventure.text.format.NamedTextColor.YELLOW : net.kyori.adventure.text.format.NamedTextColor.RED );
+ String amount = Math.min(Math.round(tps * 100.0) / 100.0, 20.0) + (tps > 21.0 ? "*" : ""); // Paper - only print * at 21, we commonly peak to 20.02 as the tick sleep is not accurate enough, stop the noise
+ return net.kyori.adventure.text.Component.text(amount, color);
+ // Paper end
}
}
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