Scalability of the .NET 4 garbage collector

Question

I recently benchmarked the .NET 4 garbage collector, allocating intensively from several threads. When the allocated values were recorded in an array, I observed no scalability

Answer 1

Not a complete answer to the question, but just to clear up some misconceptions: the .NET GC is only concurrent in workstation mode. In server mode, it uses stop-the-world parallel GC. More details here. The separate nurseries in .NET are primarily to avoid synchronisation on allocation; they are nevertheless part of the global heap and cannot be collected separately.