Lock is slowing down the performance of ThreadPool & Parallel For Loop with Tasks

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hi,

I have developed an application in which i am using Thread Pool & Parallel for loop
with lock.
But when i use lock , it slower downs the process of Thread Pool & Parrallel for loop.

Please help me.

Thanks in advance

Posted 21-Mar-11 4:21am

Mukesh P Prajapati

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Wendelius · Answer 1 · 2011-03-21T04:28:00

Solution 1

Without seeing the code isn't that what's expected to happen. If you use lock, you prevent simultaneous operations from acquiring the same lock until the lock is released. So you're queueing for the lock.

Posted 21-Mar-11 4:28am

Wendelius

Comments

Mukesh P Prajapati 22-Mar-11 3:06am

i am using the following code:

void DoSomeWork(object state)
{
lock (lockThis)
{
DataRow dr = (DataRow)state;
string uri = dr["PingURL"].ToString();
string BuyerId = dr["BuyerId"].ToString();
string PostT = dr["PostType"].ToString();
string ResponseT = dr["ResponseType"].ToString();
FirstTask(xmlData, uri, BuyerId, PostT, ResponseT);
}
}

Wendelius 23-Mar-11 15:46pm

If you're running this in a parallel loop, you'll actually serialize the operation since only one thread can enter the lock at a time. If the state passed to the method isn't shared by the threads in the loop, you could remove the lock.

J a a n s · Answer 2 · 2011-03-21T04:50:00

Solution 2

While using C#4 [Assumed from the tag!] , I don't think that you have to worry about locking the objects / Threadpool. You can make use of Parallel.For[^] method.

For more details search for PLINQ and TPL

Posted 21-Mar-11 4:50am

J a a n s