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Prevent Unbounded IntCache Growth

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Based on work by Peter Lawrey, this commit prevents unbounded growth of the integer cache and instead caps it to a value specified in the configuration (1024 by default). Should prevent thrashing, especially around world generation.
This commit is contained in:
md_5 2014-06-20 19:40:55 +10:00
parent 7f6d9d1fb7
commit b4f8ae96a2
2 changed files with 132 additions and 1 deletions
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71
CraftBukkit-Patches/0002-mc-dev-imports.patch
View file

@ -1,4 +1,4 @@
From c622cf3a0fddf3113bcf8bf27d99339fff13e400 Mon Sep 17 00:00:00 2001
From 8f6a95b59cc9531a91f2396aca273d5eb6c218bc Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Sun, 1 Dec 2013 15:10:48 +1100
Subject: [PATCH] mc-dev imports
@ -1328,6 +1328,75 @@ index 0000000..33cfdb2
+ }
+ }
+}
diff --git a/src/main/java/net/minecraft/server/IntCache.java b/src/main/java/net/minecraft/server/IntCache.java
new file mode 100644
index 0000000..9858720
--- /dev/null
+++ b/src/main/java/net/minecraft/server/IntCache.java
@@ -0,0 +1,63 @@
+package net.minecraft.server;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class IntCache {
+
+ private static int a = 256;
+ private static List b = new ArrayList();
+ private static List c = new ArrayList();
+ private static List d = new ArrayList();
+ private static List e = new ArrayList();
+
+ public static synchronized int[] a(int i) {
+ int[] aint;
+
+ if (i <= 256) {
+ if (b.isEmpty()) {
+ aint = new int[256];
+ c.add(aint);
+ return aint;
+ } else {
+ aint = (int[]) b.remove(b.size() - 1);
+ c.add(aint);
+ return aint;
+ }
+ } else if (i > a) {
+ a = i;
+ d.clear();
+ e.clear();
+ aint = new int[a];
+ e.add(aint);
+ return aint;
+ } else if (d.isEmpty()) {
+ aint = new int[a];
+ e.add(aint);
+ return aint;
+ } else {
+ aint = (int[]) d.remove(d.size() - 1);
+ e.add(aint);
+ return aint;
+ }
+ }
+
+ public static synchronized void a() {
+ if (!d.isEmpty()) {
+ d.remove(d.size() - 1);
+ }
+
+ if (!b.isEmpty()) {
+ b.remove(b.size() - 1);
+ }
+
+ d.addAll(e);
+ b.addAll(c);
+ e.clear();
+ c.clear();
+ }
+
+ public static synchronized String b() {
+ return "cache: " + d.size() + ", tcache: " + b.size() + ", allocated: " + e.size() + ", tallocated: " + c.size();
+ }
+}
diff --git a/src/main/java/net/minecraft/server/ItemSkull.java b/src/main/java/net/minecraft/server/ItemSkull.java
new file mode 100644
index 0000000..f20c69e

62
CraftBukkit-Patches/0148-Prevent-Unbounded-IntCache-Growth.patch Normal file
View file

@ -0,0 +1,62 @@
From bcb5d85cb761fa898b684ad953bf253632d7d4be Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Fri, 20 Jun 2014 19:40:00 +1000
Subject: [PATCH] Prevent Unbounded IntCache Growth
Based on work by Peter Lawrey, this commit prevents unbounded growth of the integer cache and instead caps it to a value specified in the configuration (1024 by default). Should prevent thrashing, especially around world generation.
diff --git a/src/main/java/net/minecraft/server/IntCache.java b/src/main/java/net/minecraft/server/IntCache.java
index 9858720..47e06df 100644
--- a/src/main/java/net/minecraft/server/IntCache.java
+++ b/src/main/java/net/minecraft/server/IntCache.java
@@ -17,11 +17,11 @@ public class IntCache {
if (i <= 256) {
if (b.isEmpty()) {
aint = new int[256];
- c.add(aint);
+ if (c.size() < org.spigotmc.SpigotConfig.intCacheLimit) c.add(aint);
return aint;
} else {
aint = (int[]) b.remove(b.size() - 1);
- c.add(aint);
+ if (c.size() < org.spigotmc.SpigotConfig.intCacheLimit) c.add(aint);
return aint;
}
} else if (i > a) {
@@ -29,15 +29,15 @@ public class IntCache {
d.clear();
e.clear();
aint = new int[a];
- e.add(aint);
+ if (e.size() < org.spigotmc.SpigotConfig.intCacheLimit) e.add(aint);
return aint;
} else if (d.isEmpty()) {
aint = new int[a];
- e.add(aint);
+ if (e.size() < org.spigotmc.SpigotConfig.intCacheLimit) e.add(aint);
return aint;
} else {
aint = (int[]) d.remove(d.size() - 1);
- e.add(aint);
+ if (e.size() < org.spigotmc.SpigotConfig.intCacheLimit) e.add(aint);
return aint;
}
}
diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java
index b00f635..5818cab 100644
--- a/src/main/java/org/spigotmc/SpigotConfig.java
+++ b/src/main/java/org/spigotmc/SpigotConfig.java
@@ -310,4 +310,10 @@ public class SpigotConfig
{
saveUserCacheOnStopOnly = getBoolean( "settings.save-user-cache-on-stop-only", false );
}
+
+ public static int intCacheLimit;
+ private static void intCacheLimit()
+ {
+ intCacheLimit = getInt( "settings.int-cache-limit", 1024 );
+ }
}
--
1.9.1