From 4ca7ea3911a9b4de676fc74a374ac5fef5c886ba Mon Sep 17 00:00:00 2001
From: Julian Krings <juliankrings6@gmail.com>
Date: Sat, 1 Nov 2025 22:36:25 +0100
Subject: [PATCH] minor speed improvements

---
 build.gradle.kts                                         | 6 ++++--
 .../java/com/volmit/iris/engine/mantle/MantleWriter.java | 9 +++++++--
 .../com/volmit/iris/engine/mantle/MatterGenerator.kt     | 5 ++---
 3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/build.gradle.kts b/build.gradle.kts
index dab32c3ac..2cdb4b811 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -58,8 +58,9 @@ registerCustomOutputTaskUnix("PixelMac", "/Users/test/Desktop/mcserver/plugins")
 registerCustomOutputTaskUnix("CrazyDev22LT", "/home/julian/Desktop/server/plugins")
 // ==============================================================
 
-val serverMinHeap = "2G"
-val serverMaxHeap = "8G"
+val serverMinHeap = "10G"
+val serverMaxHeap = "10G"
+val additionalFlags = "-XX:+AlwaysPreTouch"
 //Valid values are: none, truecolor, indexed256, indexed16, indexed8
 val color = "truecolor"
 val errorReporting = findProperty("errorReporting") as Boolean? ?: false
@@ -106,6 +107,7 @@ nmsBindings.forEach { key, value ->
         systemProperty("com.mojang.eula.agree", true)
         systemProperty("iris.suppressReporting", !errorReporting)
         jvmArgs("-javaagent:${project(":core:agent").tasks.jar.flatMap { it.archiveFile }.get().asFile.absolutePath}")
+        jvmArgs(additionalFlags.split(' '))
     }
 }
 
diff --git a/core/src/main/java/com/volmit/iris/engine/mantle/MantleWriter.java b/core/src/main/java/com/volmit/iris/engine/mantle/MantleWriter.java
index 021ccb67c..f8d00a2dc 100644
--- a/core/src/main/java/com/volmit/iris/engine/mantle/MantleWriter.java
+++ b/core/src/main/java/com/volmit/iris/engine/mantle/MantleWriter.java
@@ -183,8 +183,13 @@ public class MantleWriter implements IObjectPlacer, AutoCloseable {
             Iris.error("Mantle Writer Accessed chunk out of bounds" + cx + "," + cz);
             return null;
         }
-        MantleChunk chunk = cachedChunks.computeIfAbsent(Cache.key(cx, cz), k -> mantle.getChunk(cx, cz).use());
-        if (chunk == null) Iris.error("Mantle Writer Accessed " + cx + "," + cz + " and came up null (and yet within bounds!)");
+        final Long key = Cache.key(cx, cz);
+        MantleChunk chunk = cachedChunks.get(key);
+        if (chunk == null) {
+            chunk = mantle.getChunk(cx, cz).use();
+            var old = cachedChunks.put(key, chunk);
+            if (old != null) old.release();
+        }
         return chunk;
     }
 
diff --git a/core/src/main/kotlin/com/volmit/iris/engine/mantle/MatterGenerator.kt b/core/src/main/kotlin/com/volmit/iris/engine/mantle/MatterGenerator.kt
index 98340fd43..658c89cff 100644
--- a/core/src/main/kotlin/com/volmit/iris/engine/mantle/MatterGenerator.kt
+++ b/core/src/main/kotlin/com/volmit/iris/engine/mantle/MatterGenerator.kt
@@ -7,13 +7,12 @@ import com.volmit.iris.util.context.ChunkContext
 import com.volmit.iris.util.documentation.ChunkCoordinates
 import com.volmit.iris.util.mantle.Mantle
 import com.volmit.iris.util.mantle.flag.MantleFlag
+import com.volmit.iris.util.parallel.MultiBurst
 import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.asCoroutineDispatcher
 import kotlinx.coroutines.flow.FlowCollector
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
-import java.util.concurrent.Executors
 import kotlin.coroutines.EmptyCoroutineContext
 
 interface MatterGenerator {
@@ -61,7 +60,7 @@ interface MatterGenerator {
     }
 
     companion object {
-        private val dispatcher = Executors.newVirtualThreadPerTaskExecutor().asCoroutineDispatcher()
+        private val dispatcher = MultiBurst.burst.dispatcher
         private fun CoroutineScope.launch(block: suspend CoroutineScope.() -> Unit) =
             launch(if (IrisSettings.get().generator.isUseMulticoreMantle) dispatcher else EmptyCoroutineContext, block = block)
     }