pcu is a set of simple command-line utilities to expose the posix_fadvise and mincore syscalls. pcu-fadvise gives the kernel advice on the access pattern for files. This advice can affect all processes by all users accessing those files. pcu-mincore is used to determine which parts of a file are in cache. These utilties are targeted for Linux 2.6, but may work on other operating systems that support the mincore and posix_fadvise syscalls. mincore is not a part of POSIX, and posix_fadvise is uncommon despite being specified by POSIX.