From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar 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 82768ab4663b6dc220212581f92bf8c5188c73b5..f54300a107477e6b6aa79114212f0088dc4f5be5 100644 --- a/src/main/java/net/minecraft/server/MinecraftServer.java +++ b/src/main/java/net/minecraft/server/MinecraftServer.java @@ -146,7 +146,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant processQueue = new java.util.concurrent.ConcurrentLinkedQueue(); public int autosavePeriod; public CommandDispatcher vanillaCommandDispatcher; @@ -155,7 +155,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant 5000L && this.nextTick - this.lastOverloadTime >= 30000L) { // CraftBukkit long j = i / 50L; if (server.getWarnOnOverload()) // CraftBukkit - MinecraftServer.LOGGER.warn("Can't keep up! Is the server overloaded? Running {}ms or {} ticks behind", i, j); + MinecraftServer.LOGGER.warn("Can't keep up! Is the server overloaded? Running {}ms or {} ticks behind", i, j); this.nextTick += j * 50L; this.lastOverloadTime = this.nextTick; } - if ( tickCount++ % SAMPLE_INTERVAL == 0 ) + if ( ++MinecraftServer.currentTick % SAMPLE_INTERVAL == 0 ) { - double currentTps = 1E3 / ( curTime - tickSection ) * SAMPLE_INTERVAL; - recentTps[0] = calcTps( recentTps[0], 0.92, currentTps ); // 1/exp(5sec/1min) - recentTps[1] = calcTps( recentTps[1], 0.9835, currentTps ); // 1/exp(5sec/5min) - recentTps[2] = calcTps( recentTps[2], 0.9945, currentTps ); // 1/exp(5sec/15min) + final long diff = curTime - tickSection; + 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 + recentTps[0] = tps1.getAverage(); + recentTps[1] = tps5.getAverage(); + recentTps[2] = tps15.getAverage(); + // Paper end tickSection = curTime; } // Spigot end - MinecraftServer.currentTick = (int) (System.currentTimeMillis() / 50); // CraftBukkit + //MinecraftServer.currentTick = (int) (System.currentTimeMillis() / 50); // CraftBukkit // Paper - don't overwrite current tick time + lastTick = curTime; this.nextTick += 50L; GameProfilerTick gameprofilertick = GameProfilerTick.a("Server"); diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java index 6352c45db0053ce75356494ffa3b31b42d6e6414..2832610d080db4d8a6c26d946c441306404f6aba 100644 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java @@ -2113,6 +2113,17 @@ public final class CraftServer implements Server { return CraftMagicNumbers.INSTANCE; } + // Paper - Add getTPS API - Further improve tick loop + @Override + public double[] getTPS() { + 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 end + // Spigot start private final org.bukkit.Server.Spigot spigot = new org.bukkit.Server.Spigot() { diff --git a/src/main/java/org/spigotmc/TicksPerSecondCommand.java b/src/main/java/org/spigotmc/TicksPerSecondCommand.java index f5b6dec1cbe7501ce2ee9125920e810bc94670cc..e62890433ffbe0b4e48942fe6c38b599a19e58fd 100644 --- a/src/main/java/org/spigotmc/TicksPerSecondCommand.java +++ b/src/main/java/org/spigotmc/TicksPerSecondCommand.java @@ -24,22 +24,30 @@ 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( format( tps ) ); - sb.append( ", " ); + // Paper start - Further improve tick handling + double[] tps = org.bukkit.Bukkit.getTPS(); + String[] tpsAvg = new String[tps.length]; + + for ( int i = 0; i < tps.length; i++) { + tpsAvg[i] = format( tps[i] ); + } + sender.sendMessage(ChatColor.GOLD + "TPS from last 1m, 5m, 15m: " + org.apache.commons.lang.StringUtils.join(tpsAvg, ", ")); + if (args.length > 0 && args[0].equals("mem") && sender.hasPermission("bukkit.command.tpsmemory")) { + 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)"); + if (!hasShownMemoryWarning) { + sender.sendMessage(ChatColor.RED + "Warning: " + ChatColor.GOLD + " 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."); + 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 String 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 ); + + ( ( tps > 21.0 ) ? "*" : "" ) + Math.min( Math.round( tps * 100.0 ) / 100.0, 20.0 ); // Paper - only print * at 21, we commonly peak to 20.02 as the tick sleep is not accurate enough, stop the noise } }