public string[] SplitFileToSortedChunks(string sortedFilePath, long bytesOfMemoryToConsume, Func <string, int, string> getChunkPath)
{
AdjustMemoryLimit(ref bytesOfMemoryToConsume);
List <string> chunkFiles = new List <string>();
using (StreamReader reader = new StreamReader(sortedFilePath, Encoding.UTF8))
{
int chunkIndex = 0;
while (!reader.EndOfStream)
{
Console.Write($"Chunk:{chunkIndex} ");
List <string> chunkData = _chunkReader.ReadFileChunk(bytesOfMemoryToConsume, reader);
Console.WriteLine($"loaded;");
_sorter.SortChunk(chunkData, _comparer);
string chunkPath = getChunkPath(sortedFilePath, chunkIndex);
chunkFiles.Add(chunkPath);
File.WriteAllLines(chunkPath, chunkData);
chunkIndex++;
}
}
DoLargeObjectHeapCompaction();
return(chunkFiles.ToArray());
}
public string[] SplitFileToSortedChunks(string sortedFilePath, long bytesOfMemoryToConsume, Func <string, int, string> getChunkPath)
{
AdjustMemoryLimit(ref bytesOfMemoryToConsume);
ConcurrentBag <string> chunkFiles = new ConcurrentBag <string>();
List <Task> tasksStarted = new List <Task>();
using (StreamReader reader = new StreamReader(sortedFilePath, Encoding.UTF8))
{
int chunkIndex = 0;
while (!reader.EndOfStream)
{
Console.Write($"Chunk:{chunkIndex} ");
List <string> chunk = _chunkReader.ReadFileChunk(bytesOfMemoryToConsume, reader);
Console.WriteLine($"loaded;");
var newTask = Task.Factory.StartNew((o) =>
{
var state = (Tuple <List <string>, int>)o;
List <string> chunkData = state.Item1;
int currentChunkIndex = state.Item2;
_sorter.SortChunk(chunkData, _comparer);
string chunkPath = getChunkPath(sortedFilePath, currentChunkIndex);
chunkFiles.Add(chunkPath);
File.WriteAllLines(chunkPath, chunk);
}, new Tuple <List <string>, int>(chunk, chunkIndex));
tasksStarted.Add(newTask);
if (tasksStarted.Count > Environment.ProcessorCount - 1)
{
Task.WaitAny(tasksStarted.ToArray());
tasksStarted.RemoveAll(t => t.IsCompleted || t.IsCanceled || t.IsFaulted);
}
chunkIndex++;
}
Task.WaitAll(tasksStarted.ToArray());
}
// LOH is fragmented after splitting, so compaction is required to avoid occasional OOM later on
DoLargeObjectHeapCompaction();
return(chunkFiles.ToArray());
}