38 lines
1.8 KiB
Bash
Executable File
38 lines
1.8 KiB
Bash
Executable File
#!/bin/bash
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#
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# Copyright 2023 The original authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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JAVA_OPTS="--enable-preview --add-modules jdk.incubator.vector -Djdk.incubator.vector.VECTOR_ACCESS_OOB_CHECK=0"
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JAVA_OPTS="$JAVA_OPTS -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+AlwaysPreTouch"
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# These flags are mostly copied from the shipilev's branch. They don't really give a predictable benefit, but they don't hurt either.
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JAVA_OPTS="$JAVA_OPTS -XX:-TieredCompilation -XX:CICompilerCount=1 -XX:CompileThreshold=2048 -XX:-UseCountedLoopSafepoints -XX:+TrustFinalNonStaticFields"
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if [[ "$(uname -s)" == "Linux" ]]; then
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JAVA_OPTS="$JAVA_OPTS -XX:+UseTransparentHugePages"
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fi
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# https://stackoverflow.com/a/23378780/7221823
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logicalCpuCount=$([ $(uname) = 'Darwin' ] &&
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sysctl -n hw.logicalcpu_max ||
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lscpu -p | egrep -v '^#' | wc -l)
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# The required heap is proportional to the number of cores.
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# There's roughly 6MB heap per thread required for the 10k problem.
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requiredMemory=$(echo "(l(15 + 6 * $logicalCpuCount)/l(2))" | bc -l)
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heapSize=$(echo "scale=0; 2^(($requiredMemory+1)/1)" | bc)
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JAVA_OPTS="$JAVA_OPTS -Xms${heapSize}m -Xmx${heapSize}m"
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java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_melgenek
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