oomd is userspace Out-Of-Memory (OOM) killer for linux systems. Out of memory killing has historically happened inside kernel space. On a memory overcommitted linux system, malloc(2) and friends will never fail. However, if an application dereferences the returned pointer and the system has run out of physical memory, the linux kernel is forced take extreme measures, up to and including killing processes. This is typically a slow and painful process because the kernel spends an unbounded amount of time swapping in and out pages and evicting the page cache. Furthermore, configuring policy is not very flexible while being somewhat complicated.