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| Original file line number | Diff line number | Diff line change |
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| #!/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. | ||
| # | ||
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| #JAVA_OPTS="-XX:+UseZGC -server -Xms700m -Xlog:gc" | ||
| JAVA_OPTS="-XX:+UseZGC -Xms700m" | ||
| time java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_criccomini |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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. | ||
| # | ||
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| JAVA_OPTS="--enable-preview" | ||
| time java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_palmr |
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| #!/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. | ||
| # | ||
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| JAVA_OPTS="-Xmx4G" | ||
| time java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_truelive |
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src/main/java/dev/morling/onebrc/CalculateAverage_criccomini.java
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| /* | ||
| * 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. | ||
| */ | ||
| package dev.morling.onebrc; | ||
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| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.io.RandomAccessFile; | ||
| import java.nio.MappedByteBuffer; | ||
| import java.nio.channels.FileChannel; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.util.*; | ||
| import java.util.concurrent.*; | ||
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| public class CalculateAverage_criccomini { | ||
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| private static final String FILE = "./measurements.txt"; | ||
| private static final long FILE_SIZE = new File(FILE).length(); | ||
| private static final long SEGMENT_SIZE = 256_000_000; | ||
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| private static class MeasurementAggregator { | ||
| private double min = Double.POSITIVE_INFINITY; | ||
| private double max = Double.NEGATIVE_INFINITY; | ||
| private double sum; | ||
| private long count; | ||
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| public String toString() { | ||
| return round(min) + "/" + round(sum / count) + "/" + round(max); | ||
| } | ||
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| private double round(double value) { | ||
| return Math.round(value * 10.0) / 10.0; | ||
| } | ||
| } | ||
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| private static Map<String, MeasurementAggregator> processSegment(MappedByteBuffer buffer, int length) { | ||
| Map<String, MeasurementAggregator> aggregates = new HashMap<>(); | ||
| int lineStart = 0; | ||
| int doubleStart = 0; | ||
| String station = null; | ||
| for (int i = 0; i < length; ++i) { | ||
| byte b = buffer.get(i); | ||
| if (b == ';') { | ||
| byte[] stationBuffer = new byte[i - lineStart]; | ||
| buffer.position(lineStart); | ||
| buffer.get(stationBuffer); | ||
| station = new String(stationBuffer, StandardCharsets.UTF_8); | ||
| doubleStart = i + 1; | ||
| } | ||
| else if (b == '\n') { | ||
| byte[] doubleBuffer = new byte[i - doubleStart]; | ||
| buffer.position(doubleStart); | ||
| buffer.get(doubleBuffer); | ||
| Double temperature = Double.parseDouble(new String(doubleBuffer)); | ||
| lineStart = i + 1; | ||
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| MeasurementAggregator aggregator = aggregates.computeIfAbsent(station, s -> new MeasurementAggregator()); | ||
| aggregator.min = Math.min(aggregator.min, temperature); | ||
| aggregator.max = Math.max(aggregator.max, temperature); | ||
| aggregator.sum += temperature; | ||
| aggregator.count++; | ||
| } | ||
| } | ||
| return aggregates; | ||
| } | ||
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| public static void main(String[] args) throws IOException, InterruptedException, ExecutionException { | ||
| ExecutorService executor = Executors.newFixedThreadPool(128); | ||
| RandomAccessFile file = new RandomAccessFile(FILE, "r"); | ||
| long position = 0; | ||
| List<Future<Map<String, MeasurementAggregator>>> futures = new ArrayList<>(); | ||
| while (position < FILE_SIZE) { | ||
| int end = (int) Math.min(position + SEGMENT_SIZE, FILE_SIZE); | ||
| int length = (int) (end - position); | ||
| MappedByteBuffer buffer = file.getChannel().map(FileChannel.MapMode.READ_ONLY, position, length); | ||
| while (buffer.get(length - 1) != '\n') { | ||
| --length; | ||
| } | ||
| position += length; | ||
| int finalLength = length; | ||
| futures.add(executor.submit(() -> processSegment(buffer, finalLength))); | ||
| } | ||
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| executor.shutdown(); | ||
| executor.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS); | ||
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| // Merge results into a single TreeMap<String, MeasurementAggregator> | ||
| Map<String, MeasurementAggregator> aggregates = new TreeMap<>(); | ||
| for (Future<Map<String, MeasurementAggregator>> future : futures) { | ||
| Map<String, MeasurementAggregator> segmentAggregates = future.get(); | ||
| for (Map.Entry<String, MeasurementAggregator> entry : segmentAggregates.entrySet()) { | ||
| MeasurementAggregator aggregator = aggregates.computeIfAbsent(entry.getKey(), s -> new MeasurementAggregator()); | ||
| aggregator.min = Math.min(aggregator.min, entry.getValue().min); | ||
| aggregator.max = Math.max(aggregator.max, entry.getValue().max); | ||
| aggregator.sum += entry.getValue().sum; | ||
| aggregator.count += entry.getValue().count; | ||
| } | ||
| } | ||
| System.out.println(aggregates); | ||
| } | ||
| } |
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