[trishume]

I have fantasized about doing this as a startup, basically doing cache coherency protocols at the page table level with RDMA. There's some academic systems that do something like it but without the hypervisor part.

My joke fantasy startup is a cloud provider called one.computer where you just have a slider for the number of cores on your single instance, and it gives you a standard linux system that appears to have 10k cores. Most multithreaded software would absolutely trash the cache-coherency protocols and have poor performance, but it might be useful to easily turn embarrassingly parallel threaded map-reduces into multi-machine ones.