Lupin: Tolerating Partial Failures in a CXL Pod

A compute express link (CXL) pod is a collection of hosts attached to a CXL memory module. It provides an opportunity to port single-host shared-memory programs to execute on multiple hosts in a CXL pod, where the ported application achieves higher performance than a distributed application that uses network for coordination. The cost of performance scaling on a CXL pod is that applications should tolerate partial failures, where one process or operating system fails or reboots. Lupin is system software that includes kernel modifications and user-level libraries to help applications remain available while they recover from partial failures using the contents of CXL memory.