Paging

When a process causes a page fault because of missing data, this data is "paged in". When a process is forfeiting memory the data is "paged out" to swap, subsequently when this data is needed again it is "paged in" again. Paging is different from swapping because swapping moves the entire memory of a process to/from swap. Different architectures have different size of pages (pagesize):

i386: 4096 bytes

amd64: 4096 bytes

sparc: 4096 or 8192 bytes

sparc64: 8192 bytes

vax: 4096 bytes

alpha: 8192 bytes

macppc: 4096 bytes

mac68k: 4096 bytes

To find the pagesize of your system try typing "pagesize".