How many threads Parallel.For(Foreach) will create? Default MaxDegreeOfParallelism?
According to MSDN:
The default scheduler for Task Parallel Library and PLINQ uses the .NET Framework
ThreadPoolto queue and execute work. In the .NET Framework 4, theThreadPooluses the information that is provided by theSystem.Threading.Tasks.Tasktype to efficiently support the fine-grained parallelism (short-lived units of work) that parallel tasks and queries often represent.
Looking at the documentation of ThreadPool, it says:
There is one thread pool per process. Beginning with the .NET Framework 4, the default size of the thread pool for a process depends on several factors, such as the size of the virtual address space. A process can call the
GetMaxThreadsmethod to determine the number of threads. The number of threads in the thread pool can be changed by using theSetMaxThreadsmethod.