[wheels]

Note that this is pretty much only measuring thread overhead rather than thread workload throughput. So on an SMP system you'd still have the same problems with blocking I/O and only using one CPU that are part and parcel with green threads. In practice that means for something like a map-reduce pattern on a multi-core system, Ruby 1.9's native threads would win by a significant margin.

Edit: Remembered based on ice799's comment below that in 1.9 the threads still won't be allowed to operate in parallel, which neuters most of the aforementioned benefits to using native threads.