PaperMC/Spigot-Server-Patches/0110-Reduce-IO-ops-opening-a-new-region-file.patch
Aikar 3faaaab75d Optimize isInvalidYLocation, getType and getBlockData
Some pretty micro optimizations, but this is the hottest method in the server....

This will drastically reduce number of operations to perform getType

the 2 previous patches was squashed into 1
2016-06-22 22:43:02 -04:00

53 lines
1.9 KiB
Diff

From 29345dd2c97756df84a4ecf03627e92d7d759897 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 1fe5019..45d490e 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;
@@ -66,8 +69,16 @@ 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) {
@@ -77,7 +88,7 @@ public class RegionFile {
}
for (j = 0; j < 1024; ++j) {
- k = this.c.readInt();
+ k = headerAsInts.get(); // Paper
this.e[j] = k;
}
} catch (IOException ioexception) {
--
2.9.0