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 1fcdbbbc7b60edd1e87bab5f1c5d19a6755de17c..0f2011a776619301dd6a133b9a4044b4f5b69cfc 100644 --- a/src/main/java/net/minecraft/server/MinecraftServer.java +++ b/src/main/java/net/minecraft/server/MinecraftServer.java @@ -144,7 +144,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant processQueue = new java.util.concurrent.ConcurrentLinkedQueue(); public int autosavePeriod; public CommandDispatcher vanillaCommandDispatcher; @@ -153,7 +153,7 @@ 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 e531fe5e77901e6478554c6269a83028e391db5f..0d28a442e0ffb524140208710b253ca88ae21f90 100644 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java @@ -2045,6 +2045,17 @@ 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 + private final Spigot spigot = new Spigot() { diff --git a/src/main/java/org/spigotmc/TicksPerSecondCommand.java b/src/main/java/org/spigotmc/TicksPerSecondCommand.java index 9cd57c9d5fe59ceb2cd307e4e1a2052c9ac428fe..7218f23df4d06ff1ca612286e4a404246389ab18 100644 --- a/src/main/java/org/spigotmc/TicksPerSecondCommand.java +++ b/src/main/java/org/spigotmc/TicksPerSecondCommand.java @@ -26,22 +26,30 @@ 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 } }