Can IRIX “distribute” real-time capabilities to non-root users?
Yes, IRIX 6.5 includes a feature known as capabilities that extends certain IRIX privileges (such as real-time capabilities) to specific non-root users. See capabilities (4) and capability (4) for more information. With IRIX operating systems up to and including IRIX 6.4, many REACT features (schedctl, plock, sysmp, etc.) are accessible only with root privileges.