2024-01-11 09:55:24 +01:00
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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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package dev.morling.onebrc;
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2024-01-19 21:35:25 +01:00
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import java.io.IOException;
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2024-01-11 09:55:24 +01:00
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import java.io.RandomAccessFile;
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2024-01-19 21:35:25 +01:00
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import java.lang.foreign.Arena;
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import java.lang.foreign.MemorySegment;
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import java.lang.foreign.ValueLayout;
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import java.nio.channels.FileChannel;
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2024-01-11 09:55:24 +01:00
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import java.nio.charset.StandardCharsets;
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import java.util.*;
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import java.util.concurrent.ConcurrentSkipListMap;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.stream.Collector;
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import static java.util.stream.Collectors.groupingBy;
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public class CalculateAverage_kumarsaurav123 {
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private static final String FILE = "./measurements.txt";
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private static record Measurement(String station, double value) {
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private Measurement(String[] parts) {
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this(parts[0], Double.parseDouble(parts[1]));
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}
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}
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private static record Pair(long start, int size) {
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}
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private static record ResultRow(String station, double min, double mean, double max, double sum, double count) {
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public String toString() {
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return round(min) + "/" + round(mean) + "/" + round(max);
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}
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private double round(double value) {
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return Math.round(value * 10.0) / 10.0;
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}
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}
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;
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private static class MeasurementAggregator {
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private double min = Double.POSITIVE_INFINITY;
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private double max = Double.NEGATIVE_INFINITY;
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private double sum;
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private long count;
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private String station;
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}
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public static void main(String[] args) throws IOException {
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long start = System.currentTimeMillis();
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System.out.println(run(FILE));
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// System.out.println(System.currentTimeMillis() - start);
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}
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public static String run(String filePath) throws IOException {
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Collector<ResultRow, MeasurementAggregator, ResultRow> collector2 = Collector.of(
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MeasurementAggregator::new,
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(a, m) -> {
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a.min = Math.min(a.min, m.min);
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a.max = Math.max(a.max, m.max);
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a.sum += m.sum;
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a.count += m.count;
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},
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(agg1, agg2) -> {
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var res = new MeasurementAggregator();
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res.min = Math.min(agg1.min, agg2.min);
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res.max = Math.max(agg1.max, agg2.max);
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res.sum = agg1.sum + agg2.sum;
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res.count = agg1.count + agg2.count;
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return res;
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},
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agg -> {
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return new ResultRow(agg.station, agg.min, (Math.round(agg.sum * 10.0) / 10.0) / agg.count, agg.max, agg.sum, agg.count);
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});
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Collector<Measurement, MeasurementAggregator, ResultRow> collector = Collector.of(
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MeasurementAggregator::new,
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(a, m) -> {
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a.min = Math.min(a.min, m.value);
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a.max = Math.max(a.max, m.value);
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a.sum += m.value;
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a.station = m.station;
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a.count++;
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},
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(agg1, agg2) -> {
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var res = new MeasurementAggregator();
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res.min = Math.min(agg1.min, agg2.min);
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res.max = Math.max(agg1.max, agg2.max);
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res.sum = agg1.sum + agg2.sum;
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res.count = agg1.count + agg2.count;
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return res;
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},
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agg -> {
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return new ResultRow(agg.station, agg.min, agg.sum / agg.count, agg.max, agg.sum, agg.count);
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});
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ExecutorService executorService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors() * 2);
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List<ResultRow> measurements = Collections.synchronizedList(new ArrayList<ResultRow>());
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int chunkSize = 1_0000_00;
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Map<Integer, List<byte[]>> leftOutsMap = new ConcurrentSkipListMap<>();
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RandomAccessFile file = new RandomAccessFile(filePath, "r");
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long filelength = file.length();
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AtomicInteger kk = new AtomicInteger();
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MemorySegment memorySegment = file.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, filelength, Arena.global());
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int nChunks = 1000;
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int pChunkSize = Math.min(Integer.MAX_VALUE, (int) (memorySegment.byteSize() / (1000 * 20)));
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if (pChunkSize < 100) {
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pChunkSize = (int) memorySegment.byteSize();
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nChunks = 1;
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}
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ArrayList<Pair> chunks = createStartAndEnd(pChunkSize, nChunks, memorySegment);
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chunks.stream()
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.map(p -> {
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return createRunnable(memorySegment, p, collector, measurements, kk.getAndIncrement());
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})
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.forEach(executorService::submit);
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executorService.shutdown();
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try {
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executorService.awaitTermination(10, TimeUnit.MINUTES);
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}
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catch (InterruptedException e) {
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throw new RuntimeException(e);
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}
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Map<String, ResultRow> measurements2 = new TreeMap<>(measurements
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.stream()
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.parallel()
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.collect(groupingBy(ResultRow::station, collector2)));
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return measurements2.toString();
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}
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private static ArrayList<Pair> createStartAndEnd(int chunksize, int nChunks, MemorySegment memorySegment) {
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ArrayList<Pair> startSizePairs = new ArrayList<>();
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byte eol = "\n".getBytes(StandardCharsets.UTF_8)[0];
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long start = 0;
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long end = -1;
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if (nChunks == 1) {
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startSizePairs.add(new Pair(0, chunksize));
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return startSizePairs;
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}
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else {
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while (start < memorySegment.byteSize()) {
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start = end + 1;
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end = Math.min(memorySegment.byteSize() - 1, start + chunksize - 1);
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while (memorySegment.get(ValueLayout.JAVA_BYTE, end) != eol) {
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end--;
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}
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startSizePairs.add(new Pair(start, (int) (end - start + 1)));
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}
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}
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return startSizePairs;
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}
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public static Runnable createRunnable(MemorySegment memorySegment, Pair p, Collector<Measurement, MeasurementAggregator, ResultRow> collector,
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List<ResultRow> measurements, int kk) {
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return new Runnable() {
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@Override
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public void run() {
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try {
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long start = System.currentTimeMillis();
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byte[] allBytes2 = new byte[p.size];
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MemorySegment lMemory = memorySegment.asSlice(p.start, p.size);
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lMemory.asByteBuffer().get(allBytes2);
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HashMap<Byte, Integer> map = new HashMap<>();
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// Runtime runtime = Runtime.getRuntime();
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// long memoryMax = runtime.maxMemory();
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// long memoryUsed = runtime.totalMemory() - runtime.freeMemory();
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// double memoryUsedPercent = (memoryUsed * 100.0) / memoryMax;
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// System.out.println("memoryUsedPercent: " + memoryUsedPercent);
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map.put((byte) 48, 0);
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map.put((byte) 49, 1);
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map.put((byte) 50, 2);
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map.put((byte) 51, 3);
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map.put((byte) 52, 4);
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map.put((byte) 53, 5);
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map.put((byte) 54, 6);
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map.put((byte) 55, 7);
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map.put((byte) 56, 8);
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map.put((byte) 57, 9);
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byte[] eol = "\n".getBytes(StandardCharsets.UTF_8);
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byte[] sep = ";".getBytes(StandardCharsets.UTF_8);
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List<Measurement> mst = new ArrayList<>();
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int st = 0;
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for (int i = 0; i < allBytes2.length; i++) {
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if (allBytes2[i] == eol[0]) {
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byte[] s2 = new byte[i - st];
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System.arraycopy(allBytes2, st, s2, 0, s2.length);
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for (int j = 0; j < s2.length; j++) {
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if (s2[j] == sep[0]) {
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byte[] city = new byte[j];
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byte[] value = new byte[s2.length - j - 1];
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System.arraycopy(s2, 0, city, 0, city.length);
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System.arraycopy(s2, city.length + 1, value, 0, value.length);
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double d = 0.0;
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int s = -1;
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for (int k = value.length - 1; k >= 0; k--) {
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if (value[k] == 45) {
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d = d * -1;
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}
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else if (value[k] == 46) {
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}
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else {
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d = d + map.get(value[k]).intValue() * Math.pow(10, s);
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s++;
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}
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}
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mst.add(new Measurement(new String(city), d));
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}
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}
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st = i + 1;
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}
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}
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// System.out.println("Task " + kk + "Completed in " + (System.currentTimeMillis() - start));
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measurements.addAll(mst.stream()
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.collect(groupingBy(Measurement::station, collector))
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.values());
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}
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catch (Exception e) {
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// throw new RuntimeException(e);
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System.out.println("");
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}
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}
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};
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}
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}
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