.NET Locking Performance

Just a quick overview over the different lock types and their performance in .NET.

For this test, the following method was called as fast as possible for 4 seconds:

private void TestMethod() {
  lock (this) { // this locking is replaced depending on the locking type

Here are the results:

Locking Type Calls per second Factor
No locking (fastest possible) 470,972,276 19.61
Interlocked.CompareExchange 62,439,529 2.60
lock keyword 37,554,119 1.56
SpinLock (without owner tracking) 34,489,245 1.44
ReaderWriterLockSlim with LockRecursionPolicy.NoRecursion 25,214,451 1.05
ReaderWriterLockSlim with LockRecursionPolicy.SupportsRecursion 24,013,488 1.00

Full source code: Program.cs