linq contention time

Question

I'm trying to write linq in a parallel context:

Parallel.For(0, 4, op, Sub(iOppInfo, loopState)

                                   Dim r = (From a In listA

                                          Join b In listB

                                           On a.A_FieldA Equals b.B_FieldA

                                          Join c In listC On b.B_FieldB Equals c.C_FieldB

                                   Where (a.A_FieldD.Length < 5)

                                          Select a)

                                   Dim list As New List(Of ClassA)

                                   For Each e In r

                                       list.Add(e)

                                   Next

I run a profiling analyzing and found at blocked time at:

-System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()

--ConsoleApplication3.Module1._Lambda$__7(class VB$AnonymousType_0`2<class ConsoleApplication3.Module1/ClassA,class ConsoleApplication3.Module1/ClassB>,class ConsoleApplication3.Module1/ClassC)

---JIT_NewFast(struct CORINFO_CLASS_STRUCT_ *)

 (listA,listB,listC won't be changed during the operation (you can consider it as readonly))

Question: Is it normal? How can I make it not blocked? 

Making listA,listB,listC static?

Answer 1

Can you provide your project?

This forum is for discussing the tool's usage, instead of improve the performance and algorithm, so it would be off-topic in this forum, can I help you change the thread type to keep this thread here, or I need to move it to off-topic forum, if I have not misunderstood your question.

If there's any concern, please feel free to let  me know.

Best wishes,

---

Mike [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 2

I am writing to check the status of the issue on your side. 

What about this problem now? 

Would you mind letting us know the result of the suggestions?

---

Mike Zhang[MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.