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Chapter 8: Optimizing Disk I/O for a Real-Time Program

A real-time program sometimes needs to perform disk I/O under tight time constraints and without affecting the timing of other activities such as data collection. This chapter covers techniques that IRIX supports that can help you meet these performance goals, including these topics:

"Memory-Mapped I/O" points out the uses of mapping a file into memory.
"Asynchronous I/O" describes the use of the asynchronous I/O feature of IRIX version 5.3 and later.
"Synchronous Writing and Direct Writing" documents the performance cost of knowing when disk output is complete.
"Guaranteed-Rate I/O" describes the use of the guaranteed-rate feature of XFS.

Memory-Mapped I/O
Asynchronous I/O
Synchronous Writing and Direct Writing
Guaranteed-Rate I/O

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