Re: multithreaded tcp/ip server large page file

I'll spare you all the details but it's started from the class "sessionclass" which has only one sub "ThreadMain" like this:

Dim oSession As SessionClass
Dim oThread As Thread
oThread = New Thread(AddressOf oSession.ThreadMain)
oThread.Start()

It's my understanding that when the sub ThreadMain ends the tread also ends. This is true right? I have not heard of closing a thread handle.

The first thing that ThreadMain does is increment a counter and the last thing is decrement the counter. The counter is another class which uses synclock to keep the threads from conflicting with eachother. This counter is read an displayed by a timer in the main program to show how many threads are running at any given time. It usually runs between 1 and 3. Part of the processing being done by each thread is contacting a sql server and if the sql server is having problems processing by this program backs up and I've seen it with over 100 threads open before. It handles it fine as the sql request time out this program returns and error response to the TCP/IP client that the thread is handling and the sub/tread ends. It just takes much longer to timeout than to get a response from SQL most of the time so during those times the concurrent thread count will be much higher.

Charles Wang[MSFT] wrote:
Hi cj,
How did you end your thread? Generally if a thread handle is closed, the related virtual memory will be released.
I recommend that you use Process Explorer to monitor your application to check if the threads handles were closed after they ended.
You can download the tool from:
http://www.microsoft.com/technet/sysinternals/utilities/ProcessExplorer.mspx

Open Process Explorer, click View->Show Lower Panel, select Lower Panel View-> Handles.

You may check if the thread number is growing and the handles are not closed.

Best regards,
Charles Wang
Microsoft Online Community Support
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