High-Performance I/O

IRIX includes several special programming interfaces for high-performance I/O. These include:

Memory-mapped files. You can use the mpin(2) and munpin(2) commands to lock data into memory, thus reducing I/O activity.
Asynchronous I/O--IRIX has added support for asynchronous I/O in accordance with the specification in POSIX 1003.4a Draft 12.
Direct I/O--This bypasses the system buffer cache.

These interfaces are described in the REACT/Pro Release Notes.