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Merge pull request #18 from ikelaiah/ikelaiah-entry
ikelaiah's entry to the 1 BRC. New - Initial commit.
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‎entries/ikelaiah/README.md‎

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# Iwan Kelaiah
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An Entry to the One Billion Row Challenge in Object Pascal.
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The approach I implemented here is simplistic.
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- Sequentially read the measurement file.
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- Populate a `TDictionary` with station names, min, max, count and sum; without storing all the temperature measurements.
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- Use a custom comparer to sort the station and temperature statistics in a `TStringList`.
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- Display the sorted measurements using a simple for loop.
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## Getting Started
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### Dependencies
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* None. Only latest Free Pascal Compiler and Lazarus. You can get these easily by using [`https://github.com/LongDirtyAnimAlf/fpcupdeluxe/releases`](https://github.com/LongDirtyAnimAlf/fpcupdeluxe/releases).
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### Compiling
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* Open `OneBRC.lpi` using Lazarus.
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* Hit `Ctrl + F9` to compile.
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### Running the executable
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```bash
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$ ./OneBRC.exe -i your_measurements.txt
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```
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To time the execution, do the following.
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```bash
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$ time ./OneBRC.exe -i your_measurements.txt
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```
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## Help
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To see flags, use `-h`.
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```
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$ ./OneBRC.exe -h
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OneBRC -- An entry to the One Billion Row Challenge for Object Pascal
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Usage: OneBRC [-h] [-v] [-i input_file]
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-h | --help Show this help screen
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-v | --version Show the version number
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-i | --input-file <filename> Input text file to process.
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Each row is one temperature measurement in the format <string: station name>;<double: measurement>
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```
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Use `-v` to check version.
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```bash
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$ ./OneBRC.exe -v
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OneBRC version 1.0
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```
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## Authors
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Iwan Kelaiah
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[ikelaiah](https://github.com/ikelaiah)
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## Version History
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* 1.0
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* Initial Release - Sequential approach.
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## License
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This project is licensed under the MIT License - see the LICENSE.md file for details
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## Acknowledgments
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Inspiration, code snippets, etc.
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1. The FPC team, Lazarus team, fpcupdeluxe team, and other contributors.
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- For providing a usable programming language and a usable ecosystem.
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2. Gustavo 'Gus' Carreno.
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- For making this happen.
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- Borrowed Gus' approach to use `TCustomApplication` and using `unit`s properly
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to make main code more readable.
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- Borrowed and modified Gus' `WriteHelp` from the `baseline.lpr`.
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3. Székely Balázs.
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- Now I know what `Single` data type is!
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- I borrowed the custom `TStringList` comparer from the `baseline` program.
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4. Shraddha Agrawal - https://www.bytesizego.com/blog/one-billion-row-challenge-go.
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- The advice for not storing measurements for each station in a data structure.
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5. Arman Hajisafi - https://arman-hs.github.io
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- Encouragements and inspirations.

‎entries/ikelaiah/src/OneBRC.lpi‎

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<?xml version="1.0" encoding="UTF-8"?>
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<CONFIG>
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<ProjectOptions>
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<Version Value="12"/>
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<PathDelim Value="\"/>
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<General>
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<Flags>
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<MainUnitHasCreateFormStatements Value="False"/>
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<MainUnitHasTitleStatement Value="False"/>
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<MainUnitHasScaledStatement Value="False"/>
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</Flags>
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<SessionStorage Value="InProjectDir"/>
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<Title Value="OneBRC"/>
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<UseAppBundle Value="False"/>
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<ResourceType Value="res"/>
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</General>
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<BuildModes>
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<Item Name="Default" Default="True"/>
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</BuildModes>
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<PublishOptions>
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<Version Value="2"/>
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<UseFileFilters Value="True"/>
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</PublishOptions>
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<RunParams>
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<FormatVersion Value="2"/>
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</RunParams>
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<Units>
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<Unit>
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<Filename Value="OneBRC.lpr"/>
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<IsPartOfProject Value="True"/>
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</Unit>
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<Unit>
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<Filename Value="stopwatch.pas"/>
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<IsPartOfProject Value="True"/>
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<UnitName Value="Stopwatch"/>
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</Unit>
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<Unit>
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<Filename Value="weatherstation.pas"/>
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<IsPartOfProject Value="True"/>
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<UnitName Value="WeatherStation"/>
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</Unit>
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</Units>
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</ProjectOptions>
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<CompilerOptions>
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<Version Value="11"/>
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<PathDelim Value="\"/>
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<Target>
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<Filename Value="OneBRC"/>
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</Target>
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<SearchPaths>
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<IncludeFiles Value="$(ProjOutDir)"/>
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<UnitOutputDirectory Value="lib\$(TargetCPU)-$(TargetOS)"/>
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</SearchPaths>
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<CodeGeneration>
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<SmartLinkUnit Value="True"/>
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<RelocatableUnit Value="True"/>
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<Optimizations>
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<OptimizationLevel Value="2"/>
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</Optimizations>
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</CodeGeneration>
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<Linking>
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<LinkSmart Value="True"/>
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</Linking>
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</CompilerOptions>
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<Debugging>
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<Exceptions>
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<Item>
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<Name Value="EAbort"/>
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</Item>
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<Item>
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<Name Value="ECodetoolError"/>
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</Item>
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<Item>
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<Name Value="EFOpenError"/>
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</Item>
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</Exceptions>
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</Debugging>
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</CONFIG>

‎entries/ikelaiah/src/OneBRC.lpr‎

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program OneBRC;
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{
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==Credits==
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1. The FPC team, Lazarus team, fpcupdeluxe team, and other contributors.
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- For providing a usable programming language and a usable ecosystem.
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2. Gustavo 'Gus' Carreno.
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- For making this happen.
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- Borrowed Gus' approach to use `TCustomApplication` and using `unit`s properly
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to make main code more readable.
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- Borrowed and modified Gus' `WriteHelp` from the `baseline.lpr`.
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3. Székely Balázs.
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- Now I know what `Single` data type is!
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- I borrowed the custom `TStringList` comparer from the `baseline` program.
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4. Shraddha Agrawal - https://www.bytesizego.com/blog/one-billion-row-challenge-go.
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- The advice for not storing measurements for each station in a data structure.
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5. Arman Hajisafi - https://arman-hs.github.io
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- Encouragements and inspirations.
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}
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{$mode objfpc}{$H+}{$J-}{$modeSwitch advancedRecords}
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{$codepage utf8}
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//{$DEFINE DEBUG}
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uses
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{$IFDEF UNIX}
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cthreads,
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{$ENDIF}
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Classes,
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SysUtils,
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CustApp,
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WeatherStation;
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const
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version = '1.0';
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type
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{ TOneBRC }
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TOneBRC = class(TCustomApplication)
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protected
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procedure DoRun; override;
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public
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constructor Create(TheOwner: TComponent); override;
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destructor Destroy; override;
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procedure WriteHelp; virtual;
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end;
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{ TOneBRC }
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procedure TOneBRC.DoRun;
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var
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ErrorMsg: string;
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filename: string = '';
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begin
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// quick check parameters
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ErrorMsg := CheckOptions('hvi:', ['help', 'version', 'input:']);
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if ErrorMsg <> '' then
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begin
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// Commented out the default ShowException as the generated text is not user friendly.
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// ShowException(Exception.Create(ErrorMsg));
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WriteLn('Error: ', ErrorMsg);
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WriteHelp;
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Terminate;
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Exit;
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end;
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// Parse h
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if HasOption('h', 'help') then
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begin
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WriteHelp;
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Terminate;
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Exit;
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end;
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// Parse v
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if HasOption('v', 'version') then
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begin
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WriteLn('OneBRC version ', version);
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Terminate;
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Exit;
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end;
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// Parse i
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if HasOption('i', 'input') then
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begin
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filename := GetOptionValue('i', 'input');
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end;
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if (length(filename) < 4) then
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begin
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WriteLn('Input file seems invalid.');
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WriteHelp;
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Terminate;
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Exit;
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end;
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// Start the main algorithm
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WeatherStation.ProcessTempMeasurements(filename);
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// stop program loop
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Terminate;
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end;
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constructor TOneBRC.Create(TheOwner: TComponent);
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begin
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inherited Create(TheOwner);
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StopOnException := True;
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end;
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destructor TOneBRC.Destroy;
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begin
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inherited Destroy;
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end;
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procedure TOneBRC.WriteHelp;
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begin
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WriteLn('OneBRC -- An entry to the One Billion Row Challenge for Object Pascal');
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WriteLn;
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WriteLn('Usage: OneBRC [-h] [-v] [-i input_file]');
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WriteLn;
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WriteLn(' -h | --help Show this help screen');
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WriteLn(' -v | --version Show the version number');
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WriteLn(' -i | --input-file <filename> Input text file to process.');
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WriteLn(' Each row is one temperature measurement in the format <string: station name>;<double: measurement>');
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end;
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var
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Application: TOneBRC;
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begin
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Application := TOneBRC.Create(nil);
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Application.Title := 'OneBRC';
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Application.Run;
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Application.Free;
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end.

‎entries/ikelaiah/src/stopwatch.pas‎

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unit Stopwatch;
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{$mode objfpc}{$H+}{$J-}{$modeSwitch advancedRecords}
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interface
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uses
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Classes, SysUtils;
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procedure StartTimer;
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procedure StopTimer;
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procedure ResetTimer;
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procedure DisplayTimer;
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implementation
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var
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startTime: QWord = 0;
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endTime: QWord = 0;
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elapsedMilliseconds: QWord = 0;
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hours, minutes, seconds, milliseconds: word;
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procedure StartTimer;
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begin
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startTime := GetTickCount64;
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end;
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procedure StopTimer;
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begin
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endTime := GetTickCount64;
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end;
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procedure ResetTimer;
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begin
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startTime := 0;
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endTime := 0;
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elapsedMilliseconds := 0;
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end;
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procedure DisplayTimer;
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begin
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// Elapsed milliseconds
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elapsedMilliseconds := endTime - startTime;
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// Convert milliseconds to hours, minutes, seconds, and milliseconds
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hours := elapsedMilliseconds div 3600000;
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elapsedMilliseconds := elapsedMilliseconds mod 3600000;
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minutes := elapsedMilliseconds div 60000;
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elapsedMilliseconds := elapsedMilliseconds mod 60000;
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seconds := elapsedMilliseconds div 1000;
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milliseconds := elapsedMilliseconds mod 1000;
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WriteLn;
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WriteLn('------------------------------');
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WriteLn('Elapsed time: ', hours, ' hours ', minutes, ' minutes ',
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seconds, ' seconds ', milliseconds, ' milliseconds');
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//WriteLn('Elapsed time: ', (endTime - startTime), ' ms');
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end;
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end.

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