Reduce IO ops opening a new region file.

0121-Reduce-IO-ops-opening-a-new-region-file.patch

@@ -0,0 +1,53 @@
+From 63f1582ef1596bca584ec4686f3c6e7a129243f9 Mon Sep 17 00:00:00 2001
+From: Antony Riley <antony@cyberiantiger.org>
+Date: Tue, 29 Mar 2016 06:56:23 +0300
+Subject: [PATCH] Reduce IO ops opening a new region file.
+
+
+diff --git a/src/main/java/net/minecraft/server/RegionFile.java b/src/main/java/net/minecraft/server/RegionFile.java
+index 68dd17d..d82f4a1 100644
+--- a/src/main/java/net/minecraft/server/RegionFile.java
++++ b/src/main/java/net/minecraft/server/RegionFile.java
+@@ -8,9 +8,12 @@ import java.io.ByteArrayInputStream;
+ import java.io.ByteArrayOutputStream;
+ import java.io.DataInputStream;
+ import java.io.DataOutputStream;
++import java.io.EOFException;
+ import java.io.File;
+ import java.io.IOException;
+ import java.io.RandomAccessFile;
++import java.nio.ByteBuffer;
++import java.nio.IntBuffer;
+ import java.util.List;
+ import java.util.zip.DeflaterOutputStream;
+ import java.util.zip.GZIPInputStream;
+@@ -67,8 +70,16 @@ public class RegionFile {
+ 
+             int k;
+ 
++            // Paper Start
++            ByteBuffer header = ByteBuffer.allocate(8192);
++            while (header.hasRemaining())  {
++                if (this.c.getChannel().read(header) == -1) throw new EOFException();
++            }
++            header.clear();
++            IntBuffer headerAsInts = header.asIntBuffer();
++            // Paper End
+             for (j = 0; j < 1024; ++j) {
+-                k = this.c.readInt();
++                k = headerAsInts.get(); // Paper
+                 this.d[j] = k;
+                 if (k != 0 && (k >> 8) + (k & 255) <= this.f.size()) {
+                     for (int l = 0; l < (k & 255); ++l) {
+@@ -78,7 +89,7 @@ public class RegionFile {
+             }
+ 
+             for (j = 0; j < 1024; ++j) {
+-                k = this.c.readInt();
++                k = headerAsInts.get(); // Paper
+                 this.e[j] = k;
+             }
+         } catch (IOException ioexception) {
+-- 
+1.9.1
+