What would be the impact of such a coroutine emulation if the threading is used to leverage multi-core hardware for high performance computing such as done by A

What would be the impact of such a coroutine emulation if the threading is used to leverage multi-core hardware for high performance computing such as done by Atlas [1], OpenBLAS [2] or MKL [3]? These libraries are tuned to maximize CPU cache hits. It seems to me that executing each thread task sequentially using coroutines would probably break such optimizations. [1] http://math-atlas.sourceforge.net/ http://math-atlas.sourceforge.net/ [2] http://www.openblas.net/ http://www.openblas.net/ [3] http://software.intel.com/en-us/intel-mkl http://software.intel.com/en-us/intel-mkl