v1 entry

entries/dtoepfl/README.md

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+# General
+
+1. Be sure there is a valid measurements is available in .\data\measurements.txt !
+2. Open this project in Delphi
+3. Compile it as release!
+4. Execute the application (.\bin\dtpfl_1brc.dtoepfl-win-64.exe) as followed:
+   ```
+   .\bin\dtpfl_1brc.dtoepfl-win-64.exe -i ..\data\measurements.txt
+   ```
+
+## Acknowledgements
+
+Thanks to [Gustavo 'Gus' Carreno](https://github.com/gcarreno) &  [georges-hatem](https://github.com/georges-hatem)
+
+

entries/dtoepfl/src/dtpfl_1brc.dpr

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+program dtpfl_1brc;
+
+{$APPTYPE CONSOLE}
+{$R *.res}
+
+uses
+  System.SysUtils,
+  System.StrUtils,
+  System.IOUtils,
+  System.Classes,
+  System.TimeSpan,
+  System.Generics.Collections,
+  System.Diagnostics,
+  generate.console in '..\..\..\generator\Common\generate.console.pas';
+
+type TAlgorithm = (v1, v2, Count);
+var algorithm: TAlgorithm;
+    FormatSettings: TFormatSettings;
+const paramPrefix = '--';
+      paramPrefixShort = '-';
+
+function Ceiling(const ANumber: Double): integer;
+begin
+  Result := Trunc(ANumber) + Ord(Frac(ANumber) > 0);
+end;
+
+function RoundExDouble(const ATemp: Double): Double;
+var
+  tmp: Double;
+begin
+  tmp:= ATemp * 10;
+  Result := Ceiling(tmp) / 10;
+end;
+
+{$REGION 'v1'}
+
+type TStationEntry = record
+  min, max, sum: Double;
+  count: Integer;
+end;
+
+/// <summary>Simple algorithm, single-thread</summary>
+procedure runV1;
+var FileStream: TFileStream;
+    StreamReader: TStreamReader;
+    CityTemperatures: TDictionary<String, TStationEntry>;  //Station, min, avrg, max
+    Line: String;
+    Parts: TArray<String>;
+    entry: TStationEntry;
+    value: Double;
+begin
+  CityTemperatures := TDictionary<String, TStationEntry>.Create;
+
+  try
+    FileStream := TFileStream.Create(inputFilename, fmOpenRead or fmShareDenyWrite);
+    try
+      StreamReader := TStreamReader.Create(FileStream, TEncoding.UTF8);
+
+      // Read the first three bytes to check for UTF-8 BOM
+//      var NumRead := FileStream.Read(BOM, Length(BOM));
+      // If the file starts with the UTF-8 BOM, continue as is, otherwise reset the stream position.
+//      if (NumRead <> Length(BOM)) or (BOM[0] <> $EF) or (BOM[1] <> $BB) or (BOM[2] <> $BF) then
+//      begin
+//        FileStream.Position := 0; // Reset the position if no BOM or not a UTF-8 BOM
+//      end;
+
+      try
+        while not StreamReader.EndOfStream do
+        begin
+          Line := StreamReader.ReadLine;
+          Parts := SplitString(Line, ';');
+          if (TryStrToFloat(Parts[1], value, FormatSettings)) then
+          begin
+            if (CityTemperatures.ContainsKey(Parts[0])) then
+            begin
+              entry := CityTemperatures[Parts[0]];
+
+              if (value < entry.min) then   //min
+                entry.min := value;
+
+              entry.sum := (entry.sum + value);  //average
+              entry.count := entry.count + 1;
+
+              if (value > entry.max) then //max
+                entry.max := value;
+
+              CityTemperatures[Parts[0]] := entry;
+            end
+            else
+            begin
+              entry.min := value;
+              entry.count := 1;
+              entry.sum := value;
+              entry.max := value;
+              CityTemperatures.Add(Parts[0], entry);
+            end;
+          end;
+        end;
+
+
+        //Sorted output
+        var SortedKeys := TList<String>.Create(CityTemperatures.Keys);
+            SortedKeys.Sort;
+        var i := 0;
+        {$IFDEF DEBUG}
+             var vStream := TStringStream.Create('', TEncoding.UTF8);
+        {$ENDIF}
+        try
+          for var Key in SortedKeys do
+          begin
+
+             // Windows will mess up the characters when outputting to STDOUT.
+             // for debug purposes, we'll output it to a file instead.
+             //https://github.com/gcarreno/1brc-ObjectPascal/blob/main/baseline/Common/baseline.delphi.pas @https://github.com/georges-hatem
+             {$IFDEF DEBUG}
+               if (i = 0) then
+                 vStream.WriteString('{');
+
+               vStream.WriteString(Format('%s=%.1f/%.1f/%.1f', [key, CityTemperatures[key].min, RoundExDouble(CityTemperatures[key].sum / CityTemperatures[key].count), CityTemperatures[key].max], FormatSettings));
+
+               if (i = CityTemperatures.Count-1) then
+                 vStream.WriteString('}' + #10)
+               else
+                 vStream.WriteString(', ');
+
+             {$ELSE}
+               if (i = 0) then
+                Write('{');
+
+               Write(Format('%s=%.1f/%.1f/%.1f', [key, CityTemperatures[key].min, RoundExDouble(CityTemperatures[key].sum / CityTemperatures[key].count), CityTemperatures[key].max], FormatSettings));
+
+               if (i = CityTemperatures.Count-1) then
+                 Write('}' + #10)
+               else
+                 Write(', ');
+             {$ENDIF}
+
+            Inc(i);
+          end;
+
+          {$IFDEF DEBUG}
+            vStream.SaveToFile('output.txt');
+          {$ENDIF}
+
+        finally
+          {$IFDEF DEBUG}
+            vStream.Free;
+          {$ENDIF}
+        end;
+
+      finally
+        StreamReader.Free;
+      end;
+    finally
+      FileStream.Free;
+    end;
+  finally
+    CityTemperatures.Free;
+  end;
+end;
+{$ENDREGION}
+
+{$REGION 'v2'}
+procedure runV2;
+begin
+  raise Exception.Create('v2 not implemented yet!');
+end;
+{$ENDREGION}
+
+function TryGetParamValue(index: Int8): String;
+begin
+  try
+    Result := ParamStr(index + 1).ToLower
+  except on e:exception do
+    raise Exception.Create('Invalid parameter for ' + ParamStr(index) + sLineBreak + e.Message);
+  end;
+end;
+
+begin
+  try
+    FormatSettings := TFormatSettings.Create;
+    FormatSettings.DecimalSeparator := '.';
+
+    {$REGION 'Application Params'}
+    var Arg: String;
+    for var i := 1 to ParamCount do
+    begin
+      Arg := ParamStr(i).ToLower;
+
+      if (Arg = paramPrefixShort + cShortOptions[2]) or
+         (Arg = paramPrefix + cLongOptions[2]) then //input-file
+        inputFilename := TryGetParamValue(i);
+
+      if (Arg = paramPrefixShort + 'a') or
+         (Arg = paramPrefix + 'algorithm') then //algorithm
+      begin
+        const v = StringReplace(TryGetParamValue(i), 'v', '', [rfReplaceAll]);
+
+        var version: Integer;
+        if (TryStrToInt(v, version)) then
+        begin
+
+          if (Ord(TAlgorithm.Count) = version) then
+          begin
+            case version of
+              1: algorithm := TAlgorithm.v1;
+              2: algorithm := TAlgorithm.v2;
+            end;
+          end
+          else
+            raise Exception.Create('Invalid algorithm version!');
+
+        end;
+      end;
+    end;
+
+    //Check if values are valid
+    if (inputFilename.IsEmpty) then
+      raise Exception.Create(Format(rsErrorMessage, [ rsMissingInputFlag ]));
+
+    inputFilename  := ExpandFileName(inputFilename);
+    {$ENDREGION}
+
+    {$IFDEF DEBUG}
+    WriteLn('The One Billion Row Challenge in Object Pascal');
+    WriteLn('Source: https://github.com/dtpfl, https://github.com/gcarreno/1brc-ObjectPascal');
+    WriteLn;
+    WriteLn(Format(rsInputFile, [ inputFilename ]));
+    WriteLn(Format('Algorithm: v%d', [Ord(algorithm)+1]));
+    WriteLn;
+
+    var Stopwatch := TStopwatch.StartNew;
+    {$ENDIF}
+
+    if (algorithm = TAlgorithm.v1) then
+      runV1
+    else if (algorithm = TAlgorithm.v2) then
+      runv2;
+
+    {$IFDEF DEBUG}
+    var Elapsed: TTimeSpan := Stopwatch.Elapsed;
+    Writeln;
+    Writeln('Elapsed time: ' + FormatFloat('0.000', Elapsed.TotalSeconds) + ' seconds');
+    {$ENDIF}
+  except
+    on E: Exception do
+      Writeln(E.ClassName, ': ', E.Message);
+  end;
+end.