How to find error in application using threading while knowing the occurence.

Question

Hello all,

I have an application that uses threading. It creates 300 threads that are doing some data related stuff. Normally after the 300 threads are done the application waits 1 sec. And normally if i take the execution times and put them in excel i get a jump of 1 second every 300, in theory so.

But now i get first 300 jump of 1 sec, then 40 jump of 1 sec, then 20 jump of  1 sec and the last one is occurring until the end of the application. So it is going up and not the regular stepped 300 and 1 second wait.

The code where I could check the maxthread value is:

 while (true)
                            {
                                Thread.Sleep(sleepTime);
                                if (clientList.Count >= config.maxThread)
                                    continue;
                                doQuery(config.maxThread - clientList.Count);
                            }