commit b6d33fd8fed87abcce911bdda980f0ca2ec31f99 · treybastian.com/1brc

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README.md

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       This repository contains two programs:

     

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       * `dev.morling.onebrc.CreateMeasurements` (invoked via _create\_measurements.sh_): Creates the file _measurements.txt_ in the root directory of this project with a configurable number of random measurement values

     

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       * `dev.morling.onebrc.CalculateAverage` (invoked via _calculate\_average.sh_): Calculates the average values for the file _measurements.txt_

     

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       * `dev.morling.onebrc.CalculateAverage` (invoked via _calculate\_average\_baseline.sh_): Calculates the average values for the file _measurements.txt_

     

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       Execute the following steps to run the challenge:

     

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       * Create a fork of the [onebrc](https://github.com/gunnarmorling/onebrc/) GitHub repository.

     

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       * Create a copy of _CalculateAverage.java_, named _CalculateAverage\_<your_GH_user>.java_, e.g. _CalculateAverage\_doloreswilson.java_.

     

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       * Make that implementation fast. Really fast.

     

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       * Create a copy of _calculate_average.sh_, named _calculate\_average\_<your_GH_user>.sh_, e.g. _calculate\_average\_doloreswilson.sh_.

     

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       * Create a copy of _calculate_average_baseline.sh_, named _calculate\_average\_<your_GH_user>.sh_, e.g. _calculate\_average\_doloreswilson.sh_.

     

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       * Adjust that script so that it references your implementation class name. If needed, provide any JVM arguments via the `JAVA_OPTS` variable in that script.

     

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       * OpenJDK 21 is the default. If a custom JDK build is required, include the SDKMAN command `sdk use java [version]` in the launch shell script prior to application start.

     

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       * (Optional) If you'd like to use native binaries (GraalVM), adjust the _pom.xml_ file so that it builds that binary.

calculate_average.sh calculate_average_baseline.sh

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evaluate.sh

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       mvn clean verify

     

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       rm -f measurements.txt

     

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       ln -s measurements_1B.txt measurements.txt

     

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       for i in {1..5}

     

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       do

     

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           ./calculate_average_$1.sh

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process_output.java

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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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       import java.nio.file.Files;

     

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       import java.nio.file.Paths;

     

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       import java.util.ArrayList;

     

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       import java.util.List;

     

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       import java.util.stream.Collectors;

     

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       public class process_output {

     

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           public static void main(String... args) throws Exception {

     

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               String expectedFile = args[0];

     

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               String actualFile = args[1];

     

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               String expected = new String(Files.readAllBytes(Paths.get(expectedFile)));

     

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               List<String> times = new ArrayList<>();

     

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               var outputLines = Files.lines(Paths.get(actualFile))

     

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                       .collect(Collectors.toList());

     

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               int matched = 0;

     

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               for (String line : outputLines) {

     

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                   if (line.contains("Hamburg")) {

     

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                       if (!line.equals(expected)) {

     

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                           System.err.println("FAILURE Unexpected output");

     

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                           System.err.println(line);

     

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                       }

     

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                       else {

     

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                           matched++;

     

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                       }

     

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                   }

     

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                   else if (line.startsWith("real")) {

     

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                       times.add(line);

     

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                   }

     

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               }

     

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               if (matched == 5) {

     

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                   System.out.println("OK Output matched");

     

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               }

     

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               else {

     

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                   System.err.println("FAILURE Output didn't match");

     

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               }

     

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               System.out.println();

     

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               System.out.println(actualFile);

     

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               System.out.println(times.stream()

     

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                   .map(t -> t.substring(5))

     

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                   .map(t -> t.replace("s", "").replace("m", ":"))

     

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                   .collect(Collectors.joining(System.lineSeparator())));

     

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           }

     

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       }

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src/test/resources/samples/measurements-20.out

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       {Abéché1️⃣🐝🏎️=27.3/27.3/27.3, Almaty1️⃣🐝🏎️=15.3/15.3/15.3, Baghdad1️⃣🐝🏎️=26.0/26.0/26.0, Bangkok1️⃣🐝🏎️=25.6/25.6/25.6, Berlin1️⃣🐝🏎️=-0.3/-0.3/-0.3, Birao1️⃣🐝🏎️=33.5/33.5/33.5, Canberra1️⃣🐝🏎️=5.2/5.2/5.2, Chittagong1️⃣🐝🏎️=12.6/12.6/12.6, Da Nang1️⃣🐝🏎️=33.7/33.7/33.7, Edinburgh1️⃣🐝🏎️=19.8/19.8/19.8, Irkutsk1️⃣🐝🏎️=9.9/9.9/9.9, Lhasa1️⃣🐝🏎️=13.4/13.4/13.4, Lyon1️⃣🐝🏎️=1.8/1.8/1.8, Mogadishu1️⃣🐝🏎️=11.5/11.5/11.5, Nashville1️⃣🐝🏎️=-4.9/-4.9/-4.9, Odesa1️⃣🐝🏎️=6.5/6.5/6.5, Parakou1️⃣🐝🏎️=36.3/36.3/36.3, Tamanrasset1️⃣🐝🏎️=17.9/17.9/17.9, Tirana1️⃣🐝🏎️=27.7/27.7/27.7, Xi'an1️⃣🐝🏎️=17.5/17.5/17.5}

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src/test/resources/samples/measurements-20.txt

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       Odesa1️⃣🐝🏎️;6.5

     

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       Canberra1️⃣🐝🏎️;5.2

     

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       Lhasa1️⃣🐝🏎️;13.4

     

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       Edinburgh1️⃣🐝🏎️;19.8

     

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       Da Nang1️⃣🐝🏎️;33.7

     

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       Xi'an1️⃣🐝🏎️;17.5

     

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       Berlin1️⃣🐝🏎️;-0.3

     

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       Tamanrasset1️⃣🐝🏎️;17.9

     

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       Abéché1️⃣🐝🏎️;27.3

     

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       Baghdad1️⃣🐝🏎️;26.0

     

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       Lyon1️⃣🐝🏎️;1.8

     

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       Mogadishu1️⃣🐝🏎️;11.5

     

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       Bangkok1️⃣🐝🏎️;25.6

     

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       Irkutsk1️⃣🐝🏎️;9.9

     

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       Parakou1️⃣🐝🏎️;36.3

     

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       Almaty1️⃣🐝🏎️;15.3

     

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       Birao1️⃣🐝🏎️;33.5

     

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       Chittagong1️⃣🐝🏎️;12.6

     

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       Tirana1️⃣🐝🏎️;27.7

     

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       Nashville1️⃣🐝🏎️;-4.9

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src/test/resources/samples/measurements-3.out

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       {Bosaso=-15.0/1.3/20.5, Petropavlovsk-Kamchatsky=-9.5/0.0/9.5}

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src/test/resources/samples/measurements-3.txt

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       Bosaso;5.0

     

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       Bosaso;20.0

     

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       Bosaso;-5.0

     

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       Bosaso;-15.0

     

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       Petropavlovsk-Kamchatsky;9.5

     

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       Petropavlovsk-Kamchatsky;-9.5

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src/test/resources/samples/measurements-boundaries.out

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       {Bosaso=-99.9/-99.9/-99.9, Petropavlovsk-Kamchatsky=99.9/99.9/99.9}

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src/test/resources/samples/measurements-boundaries.txt

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       Bosaso;-99.9

     

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       Petropavlovsk-Kamchatsky;99.9

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test.sh

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         rm -f measurements.txt

     

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         ln -s $sample measurements.txt

     

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         diff <(./calculate_average.sh) ${sample%.txt}.out

     

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         diff <("./calculate_average_$1.sh") ${sample%.txt}.out

     

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       done

     

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       rm measurements.txt