artpar's attempt

* artpar's attempt

* artpar's attempt

* remove int -> Integer conversions, custom parsing for measurements

* remove allocations by caching station names
also remove Integer and use int instead to remove valueOf calls

* Fix result mismatch errors

* parse int instead of double

* reduce time spent reading the mapped buffer

* cleanup unused memory

* less is faster ? vector addition doesn't look worth it

* backout from virtual threads as well

* Fix breaking tests

calculate_average_artpar.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+#
+#  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="--add-modules=jdk.incubator.vector"
+time java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_artpar