PPT Slide
VM Systems used in Actual OSes
- UNIX 4.3 BSD
- 2-handed clock replacment
- UNIX 4.4 BSD: based on Mach VM architecture.
- DEC VMS: local FIFO with standby list.
- Macintosh: second-chance clock replacement.
- IBM MVS: 4 KB page size; 3-level paging.
Useful UNIX commands to view paging behavior.
- top
- vmstat
- monitor (AIX only)