Use crac to start faster

calculate_average_ianopolousfast.sh

@@ -15,6 +15,4 @@
 #  limitations under the License.
 #
 
-JAVA_OPTS="--enable-preview --add-modules=jdk.incubator.vector -Djdk.incubator.vector.VECTOR_ACCESS_OOB_CHECK=0 -XX:-UseTransparentHugePages"
-
-java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_ianopolousfast
+java -XX:CRaCRestoreFrom=$HOME/ianopolousfast --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_ianopolousfast

prepare_ianopolousfast.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+#
+#  Copyright 2023 The original authors
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
+source "$HOME/.sdkman/bin/sdkman-init.sh"
+sdk use java 21.0.2.crac-zulu 1>&2
+
+JAVA_OPTS="--enable-preview --add-modules=jdk.incubator.vector -Djdk.incubator.vector.VECTOR_ACCESS_OOB_CHECK=0 -XX:-UseTransparentHugePages -XX:CRaCCheckpointTo=$HOME/ianopolousfast"
+
+java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_ianopolousfast

src/main/java/dev/morling/onebrc/CalculateAverage_ianopolousfast.java

@@ -15,6 +15,7 @@
  */
 package dev.morling.onebrc;
 
+import jdk.crac.Core;
 import jdk.incubator.vector.ByteVector;
 import jdk.incubator.vector.VectorOperators;
 import jdk.incubator.vector.VectorSpecies;
@@ -50,6 +51,7 @@ public class CalculateAverage_ianopolousfast {
             : ByteVector.SPECIES_64;
 
     public static void main(String[] args) throws Exception {
+        Core.checkpointRestore();
         Arena arena = Arena.global();
         Path input = Path.of("measurements.txt");
         FileChannel channel = (FileChannel) Files.newByteChannel(input, StandardOpenOption.READ);