private async Task <PerformanceReport> DoExternalSort(string pathToSourceFile, string targetFileName)
{
using var runRepository = _repositoryProvider.CreateNewRepository();
var performanceReport = new PerformanceReport();
var stopwatch = Stopwatch.StartNew();
await _fileSplitter.Split(
pathToSourceFile : pathToSourceFile,
repository : runRepository,
runSizeHintInBytes : GetRunSizeHint(),
lineLengthHintInBytes : 24,
maxDegreeOfParallelism : GetDegreeOfParallelism()
);
stopwatch.Stop();
performanceReport.SplitTime = stopwatch.Elapsed;
stopwatch = Stopwatch.StartNew();
await MergeSortedRuns(runRepository, targetFileName);
stopwatch.Stop();
performanceReport.MergeTime = stopwatch.Elapsed;
return(performanceReport);
}
private void LogPerformanceInfo(PerformanceReport perfReport)
{
var timeTaken = perfReport.TotalTime;
var totalSeconds = timeTaken.TotalSeconds;
_logger($"Sorted the file '{_sourceFilePath}' in {timeTaken}/{totalSeconds:0.##} seconds.");
}