January 2004
Intermediate to advanced
432 pages
11h 1m
English
Content preview from HP-UX 11i Internals
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Chapter 7. The HP-UX Paging System
Classic UNIX featured a program swapping system. When the kernel needed to make room in-core memory for a process to run, it would select an inactive process or one of a lesser priority and move it from physical memory to a temporary storage location on disk. The program was then said to be swapped out. Before the process could run again, it would have to be swapped back into memory. This could tie up a large portion of the system's I/O bandwidth. Whole process swapping has been relegated to the history books: modern kernels utilize a demand paging system.