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Improvements to Timings concurrency and lookup performance

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ConcurrentHashMap synchronizes on .computeIfAbsent even on hits,
so this does a .get(key) first, which most of our use should
be hits, and then falls back to the CHM computeIfAbsent for thread safe puts.

Also improve concurrency on handler and group collections to use a synchronized
list instead of an array deque for concurrency safety.
This commit is contained in:
Aikar 2019-02-23 14:22:43 -05:00
parent 7ab257e4f1
commit d1b6d22eac
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GPG key ID: 401ADFC9891FAAFE
1 changed files with 55 additions and 40 deletions
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57
Spigot-API-Patches/0004-Timings-v2.patch
View file

@ -1,4 +1,4 @@
From 3bb80307cfe675a18922158a1d2b1427e334a27b Mon Sep 17 00:00:00 2001
From 2853582c3382e794163a9c8a02e139eac9a8ea8e Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 29 Feb 2016 18:48:17 -0600
Subject: [PATCH] Timings v2
@ -662,7 +662,7 @@ index 00000000..521c985e
+}
diff --git a/src/main/java/co/aikar/timings/TimingHistory.java b/src/main/java/co/aikar/timings/TimingHistory.java
new file mode 100644
index 00000000..28d0954a
index 00000000..e08a25f5
--- /dev/null
+++ b/src/main/java/co/aikar/timings/TimingHistory.java
@@ -0,0 +1,345 @@
@ -692,9 +692,7 @@ index 00000000..28d0954a
+package co.aikar.timings;
+
+import co.aikar.timings.TimingHistory.RegionData.RegionId;
+import co.aikar.util.JSONUtil;
+import com.google.common.base.Function;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
+import org.bukkit.Bukkit;
+import org.bukkit.Chunk;
@ -759,12 +757,14 @@ index 00000000..28d0954a
+ }
+ this.totalTicks = ticks;
+ this.totalTime = FULL_SERVER_TICK.record.getTotalTime();
+ synchronized (TimingsManager.HANDLERS) {
+ this.entries = new TimingHistoryEntry[TimingsManager.HANDLERS.size()];
+
+ int i = 0;
+ for (TimingHandler handler : TimingsManager.HANDLERS) {
+ entries[i++] = new TimingHistoryEntry(handler);
+ }
+ }
+
+
+ // Information about all loaded chunks/entities
@ -1074,10 +1074,10 @@ index 00000000..0e114eb3
+}
diff --git a/src/main/java/co/aikar/timings/TimingIdentifier.java b/src/main/java/co/aikar/timings/TimingIdentifier.java
new file mode 100644
index 00000000..a7f1f44d
index 00000000..d3258a09
--- /dev/null
+++ b/src/main/java/co/aikar/timings/TimingIdentifier.java
@@ -0,0 +1,106 @@
@@ -0,0 +1,107 @@
+/*
+ * This file is licensed under the MIT License (MIT).
+ *
@ -1104,9 +1104,10 @@ index 00000000..a7f1f44d
+package co.aikar.timings;
+
+import co.aikar.util.LoadingMap;
+import co.aikar.util.MRUMapCache;
+
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.concurrent.ConcurrentHashMap;
@ -1164,7 +1165,7 @@ index 00000000..a7f1f44d
+ final int id = idPool.getAndIncrement();
+
+ final String name;
+ ArrayDeque<TimingHandler> handlers = new ArrayDeque<TimingHandler>(64);
+ final List<TimingHandler> handlers = Collections.synchronizedList(new ArrayList<>(64));
+
+ private TimingGroup(String name) {
+ this.name = name;
@ -1601,10 +1602,10 @@ index 00000000..56b10e89
+}
diff --git a/src/main/java/co/aikar/timings/TimingsExport.java b/src/main/java/co/aikar/timings/TimingsExport.java
new file mode 100644
index 00000000..df7f4259
index 00000000..4a69074a
--- /dev/null
+++ b/src/main/java/co/aikar/timings/TimingsExport.java
@@ -0,0 +1,342 @@
@@ -0,0 +1,350 @@
+/*
+ * This file is licensed under the MIT License (MIT).
+ *
@ -1760,8 +1761,12 @@ index 00000000..df7f4259
+
+
+ Map handlers = createObject();
+ Map groupData;
+ synchronized (TimingIdentifier.GROUP_MAP) {
+ for (TimingIdentifier.TimingGroup group : TimingIdentifier.GROUP_MAP.values()) {
+ synchronized (group.handlers) {
+ for (TimingHandler id : group.handlers) {
+
+ if (!id.isTimed() && !id.isSpecial()) {
+ continue;
+ }
@ -1771,10 +1776,14 @@ index 00000000..df7f4259
+ ));
+ }
+ }
+ }
+
+ groupData = toObjectMapper(
+ TimingIdentifier.GROUP_MAP.values(), group -> pair(group.id, group.name));
+ }
+
+ parent.put("idmap", createObject(
+ pair("groups", toObjectMapper(
+ TimingIdentifier.GROUP_MAP.values(), group -> pair(group.id, group.name))),
+ pair("groups", groupData),
+ pair("handlers", handlers),
+ pair("worlds", toObjectMapper(TimingHistory.worldMap.entrySet(), input -> pair(input.getValue(), input.getKey()))),
+ pair("tileentity",
@ -1949,10 +1958,10 @@ index 00000000..df7f4259
+}
diff --git a/src/main/java/co/aikar/timings/TimingsManager.java b/src/main/java/co/aikar/timings/TimingsManager.java
new file mode 100644
index 00000000..f63e7033
index 00000000..127651ff
--- /dev/null
+++ b/src/main/java/co/aikar/timings/TimingsManager.java
@@ -0,0 +1,187 @@
@@ -0,0 +1,189 @@
+/*
+ * This file is licensed under the MIT License (MIT).
+ *
@ -1978,18 +1987,16 @@ index 00000000..f63e7033
+ */
+package co.aikar.timings;
+
+import co.aikar.util.LoadingMap;
+import com.google.common.collect.EvictingQueue;
+import org.bukkit.Bukkit;
+import org.bukkit.Server;
+import org.bukkit.command.Command;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.plugin.java.PluginClassLoader;
+import co.aikar.util.LoadingMap;
+
+import javax.annotation.Nullable;
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
@ -2006,7 +2013,7 @@ index 00000000..f63e7033
+ public static List<String> hiddenConfigs = new ArrayList<String>();
+ public static boolean privacy = false;
+
+ static final List<TimingHandler> HANDLERS = new ArrayList<>(1024);
+ static final List<TimingHandler> HANDLERS = Collections.synchronizedList(new ArrayList<>(1024));
+ static final List<TimingHistory.MinuteReport> MINUTE_REPORTS = new ArrayList<>(64);
+
+ static EvictingQueue<TimingHistory> HISTORY = EvictingQueue.create(12);
@ -2033,6 +2040,7 @@ index 00000000..f63e7033
+ if (Timings.timingsEnabled) {
+ boolean violated = FULL_SERVER_TICK.isViolated();
+
+ synchronized (HANDLERS) {
+ for (TimingHandler handler : HANDLERS) {
+ if (handler.isSpecial()) {
+ // We manually call this
@ -2040,6 +2048,7 @@ index 00000000..f63e7033
+ }
+ handler.processTick(violated);
+ }
+ }
+
+ TimingHistory.playerTicks += Bukkit.getOnlinePlayers().size();
+ TimingHistory.timedTicks++;
@ -2075,10 +2084,12 @@ index 00000000..f63e7033
+ } else {
+ // Soft resets only need to act on timings that have done something
+ // Handlers can only be modified on main thread.
+ synchronized (HANDLERS) {
+ for (TimingHandler timings : HANDLERS) {
+ timings.reset(false);
+ }
+ }
+ }
+
+ HANDLERS.clear();
+ MINUTE_REPORTS.clear();
@ -2530,10 +2541,10 @@ index 00000000..24eae4be
+}
diff --git a/src/main/java/co/aikar/util/LoadingMap.java b/src/main/java/co/aikar/util/LoadingMap.java
new file mode 100644
index 00000000..9a4f9dca
index 00000000..dfefda35
--- /dev/null
+++ b/src/main/java/co/aikar/util/LoadingMap.java
@@ -0,0 +1,339 @@
@@ -0,0 +1,343 @@
+/*
+ * This file is licensed under the MIT License (MIT).
+ *
@ -2787,6 +2798,10 @@ index 00000000..9a4f9dca
+
+ @Override
+ public V get(Object key) {
+ V v = backingMap.get(key);
+ if (v != null) {
+ return v;
+ }
+ return backingMap.computeIfAbsent((K) key, loader);
+ }
+