> almost all prevailing contemporary environments use virtual memory IBM's Compute Node Kernel (Blue Gene) uses offset-mapped memory (no TLB). This is great fo

> almost all prevailing contemporary environments use virtual memory IBM's Compute Node Kernel (Blue Gene) uses offset-mapped memory (no TLB). This is great for reproducible performance (much less than 1% variability on thousands of cores, compare to 30% or more on Cray). Admittedly, most jobs running on CNK will use constant stack sizes across all threads, but not all. The C standard does not specify that the language be implemented using a stack at all, so it would be inconsistent to provide an API for manipulating stack sizes.