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I would like to write a small piece of program that launches threads, consumes available RAM memory in a linear fashion, until a certain level, and stops (ideally, pauses until "enough" memory is freed and continues creating threads after that, and so on.) I tried the following, but the list.Add(new byte[]) requires contiguous RAM space and drops an OutOfMemoryException , which is NOT what I am trying to simulate. EDIT : I have a multi-threaded memory-hungry application that eats up a whole bunch of RAM GB's. All I want is to isolate/reproduce that situation in "Lab conditions" to tackle it, i.e write an adaptive mem-monitoring / thread-limiter draft. I am using x64 OS an x64 Platform. To make it clear : The result I want to see is the Task Manager Memory Monitor going up straight due to the program. static void Main(string[] args) { ComputerInfo ci = new ComputerInfo(); D("TOTAL PHYSICAL MEMORY : " + Math.Round(ci.TotalPhysicalMemory / Math.Pow(10,9),3) +" GB"); //########### Fill Memory ############### var list = new List<byte[]>(); Thread FillMem= new Thread(delegate() { while (Process.GetCurrentProcess().PrivateMemorySize64 < MAX_MEM_LEVEL) { list.Add(new byte[1024 * 10000]); //<- I Need to change this Thread.Sleep(100); } }); FillMem.Start(); //########### Show used Memory ############### Thread MonitorMem = new Thread(delegate() { while (true) { D("PROCESS MEMORY : " + Math.Round(Process.GetCurrentProcess().PrivateMemorySize64 / Math.Pow(10, 6), 3) + " MB"); Thread.Sleep(1000); } }); MonitorMem.Start(); Console.Read(); }

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