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 26f6a3d2d70078f300412a5076afb8a19818cd25..65b2fa69fd36addc9534f069cce8ec95cf1122a2 100644 --- a/src/main/java/net/minecraft/server/MinecraftServer.java +++ b/src/main/java/net/minecraft/server/MinecraftServer.java @@ -285,7 +285,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop processQueue = new java.util.concurrent.ConcurrentLinkedQueue(); public int autosavePeriod; public Commands vanillaCommandDispatcher; @@ -294,7 +294,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop 5000L && this.nextTickTime - this.lastOverloadWarning >= 30000L) { // CraftBukkit long j = i / 50L; if (this.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.nextTickTime += j * 50L; this.lastOverloadWarning = this.nextTickTime; } - if ( tickCount++ % MinecraftServer.SAMPLE_INTERVAL == 0 ) + if ( ++MinecraftServer.currentTick % MinecraftServer.SAMPLE_INTERVAL == 0 ) { - 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) + 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 + this.recentTps[0] = tps1.getAverage(); + this.recentTps[1] = tps5.getAverage(); + this.recentTps[2] = tps15.getAverage(); + // Paper end tickSection = curTime; } // Spigot end @@ -1022,7 +1080,8 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop 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 } }