1brc/prepare_thomaswue.sh

#!/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-graal 1>&2

# ./mvnw clean verify removes target/ and will re-trigger native image creation.
if [ ! -f target/CalculateAverage_thomaswue_image ]; then

    # Performance tuning flags, optimization level 3, maximum inlining exploration, and compile for the architecture where the native image is generated.
    NATIVE_IMAGE_OPTS="-O3 -H:TuneInlinerExploration=1 -march=native"
   
    # Need to enable preview for accessing the raw address of the foreign memory access API.
    # Initializing the Scanner to make sure the unsafe access object is known as a non-null compile time constant.
    NATIVE_IMAGE_OPTS="$NATIVE_IMAGE_OPTS --enable-preview --initialize-at-build-time=dev.morling.onebrc.CalculateAverage_thomaswue\$Scanner"

    # There is no need for garbage collection and therefore also no safepoints required.
    NATIVE_IMAGE_OPTS="$NATIVE_IMAGE_OPTS --gc=epsilon -H:-GenLoopSafepoints"

    # Uncomment the following line for outputting the compiler graph to the IdealGraphVisualizer
    # NATIVE_IMAGE_OPTS="$NATIVE_IMAGE_OPTS -H:MethodFilter=CalculateAverage_thomaswue.* -H:Dump=:2 -H:PrintGraph=Network"
    
    native-image $NATIVE_IMAGE_OPTS -cp target/average-1.0.0-SNAPSHOT.jar -o target/CalculateAverage_thomaswue_image dev.morling.onebrc.CalculateAverage_thomaswue
fi