serkan-ozal: Initial impl (#553)

* Initial impl

* Fix bad file descriptor error in the `calculate_average_serkan-ozal.sh`

* Disable Epsilon GC and rely on default GC. Because apparently, JIT and Epsilon GC don't play well together in the eval machine for short lived Vector API's `ByteVector` objects

* Take care of byte order before processing key length with bit shift operators

* Fix key equality check for long keys

calculate_average_serkan-ozal.sh

@@ -0,0 +1,30 @@
+#!/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.
+#
+
+JAVA_OPTS="--enable-preview --enable-native-access=ALL-UNNAMED --add-modules=jdk.incubator.vector"
+JAVA_OPTS="$JAVA_OPTS -XX:-TieredCompilation -XX:MaxInlineSize=10000 -XX:InlineSmallCode=10000 -XX:FreqInlineSize=10000"
+JAVA_OPTS="$JAVA_OPTS -Djdk.incubator.vector.VECTOR_ACCESS_OOB_CHECK=0"
+#JAVA_OPTS="$JAVA_OPTS -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -Xms256m -Xmx256m -XX:+AlwaysPreTouch"
+if [[ ! "$(uname -s)" = "Darwin" ]]; then
+  JAVA_OPTS="$JAVA_OPTS -XX:+UseTransparentHugePages"
+fi
+
+#echo "Process started at $(date +%s%N | cut -b1-13)"
+eval "exec 3< <({ CLOSE_STDOUT_ON_RESULT=true USE_SHARED_ARENA=true java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_serkan_ozal; })"
+read <&3 result
+echo -e "$result"
+#echo "Process finished at $(date +%s%N | cut -b1-13)"