Agent skill
dotnet-parallel
.NET 병렬 처리 패턴 (Parallel, PLINQ, ConcurrentCollections)
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/dotnet-parallel
SKILL.md
.NET 병렬 처리
CPU 바운드 작업의 병렬 처리를 위한 API 및 패턴 가이드입니다.
1. 핵심 API
| API | 용도 |
|---|---|
Parallel.For, Parallel.ForEach |
CPU 바운드 병렬 처리 |
PLINQ (.AsParallel()) |
LINQ 쿼리 병렬화 |
Partitioner<T> |
대용량 데이터 파티셔닝 |
ConcurrentDictionary<K,V> |
Thread-safe 딕셔너리 |
2. Parallel 클래스
2.1 Parallel.ForEach
public sealed class ImageProcessor
{
public void ProcessImages(IEnumerable<string> imagePaths)
{
var options = new ParallelOptions
{
MaxDegreeOfParallelism = Environment.ProcessorCount
};
Parallel.ForEach(imagePaths, options, path =>
{
ProcessImage(path);
});
}
}
2.2 조기 중단
Parallel.For(0, data.Length, (i, state) =>
{
if (data[i] == target)
{
state.Break();
}
});
3. PLINQ
var results = data
.AsParallel()
.WithDegreeOfParallelism(Environment.ProcessorCount)
.Where(d => d.IsValid)
.Select(d => Transform(d))
.ToList();
// 순서 유지 필요 시
var results = data
.AsParallel()
.AsOrdered()
.Select(d => Process(d))
.ToList();
4. Thread-Safe 컬렉션
| 컬렉션 | 용도 |
|---|---|
ConcurrentDictionary<K,V> |
Thread-safe 딕셔너리 |
ConcurrentQueue<T> |
Thread-safe FIFO 큐 |
ConcurrentBag<T> |
Thread-safe 순서 없는 컬렉션 |
// 병렬 처리 중 결과 수집
var results = new ConcurrentBag<Result>();
Parallel.ForEach(data, item =>
{
var result = Process(item);
results.Add(result);
});
5. ThreadLocal
스레드별 독립 변수로 경합 방지
private readonly ThreadLocal<StringBuilder> _localBuilder =
new(() => new StringBuilder());
public void ProcessInParallel()
{
Parallel.For(0, 1000, i =>
{
var sb = _localBuilder.Value!;
sb.Clear();
sb.Append(i);
});
}
6. 주의사항
⚠️ 병렬 처리 vs 비동기
- CPU 바운드: Parallel 사용
- I/O 바운드: async-await 사용
// ❌ I/O 작업에 Parallel 사용
Parallel.ForEach(urls, url => httpClient.GetAsync(url).Result);
// ✅ I/O 작업에 async-await 사용
await Task.WhenAll(urls.Select(url => httpClient.GetAsync(url)));
⚠️ 공유 상태 동기화
// ❌ 일반 컬렉션에 병렬 쓰기
var list = new List<int>();
Parallel.For(0, 1000, i => list.Add(i)); // Race condition!
// ✅ Thread-safe 컬렉션 사용
var bag = new ConcurrentBag<int>();
Parallel.For(0, 1000, i => bag.Add(i));
7. 참고 문서
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