mirror of
https://github.com/PaperMC/Paper.git
synced 2024-12-30 16:19:03 +01:00
f65939c6bd
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.
233 lines
13 KiB
Diff
233 lines
13 KiB
Diff
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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
|
|
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
|
|
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
|
|
@@ -0,0 +0,0 @@ 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;
|
|
@@ -0,0 +0,0 @@ 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
|
|
@@ -0,0 +0,0 @@ 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() {
|
|
@@ -0,0 +0,0 @@ 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;
|
|
|
|
@@ -0,0 +0,0 @@ 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;
|
|
@@ -0,0 +0,0 @@ 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;
|
|
this.startMetricsRecordingTick();
|
|
this.profiler.push("tick");
|
|
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
|
|
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
|
|
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
|
|
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
|
|
@@ -0,0 +0,0 @@ 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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
|
|
--- a/src/main/java/org/spigotmc/TicksPerSecondCommand.java
|
|
+++ b/src/main/java/org/spigotmc/TicksPerSecondCommand.java
|
|
@@ -0,0 +0,0 @@ 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)
|
|
@@ -0,0 +0,0 @@ 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
|
|
}
|
|
}
|