September 2002
Beginner to intermediate
216 pages
7h 43m
English
Content preview from Mac OS X for Unix Geeks
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vm_stat
The vm_stat utility displays virtual memory statistics. Unlike implementations of vm_stat in other Unix systems, it does not default to continuous display. Instead, it displays accumulated statistics.
To obtain a continuous display, specify an interval argument (in seconds), as in vm_stat 1. Figure 8-3 shows the output of vm_stat with no arguments, and Figure 8-4 shows the output of vm_stat 1. Table 8-4 describes the information that vm_stat displays (the item numbers correspond to the callouts in both figures).
 |
Figure 8-3. vm_stat displaying accumulated statistics
 |
Figure 8-4. vm_stat’s continuous output
Table 8-4. Information displayed by vm_stat
|
Item number |
Accumulated mode |
Continuous mode |
Description |
1 |
Pages free |
free |
Total free pages |
2 |
Pages active |
active |
Total pages in use that can be paged out |
3 |
Pages inactive |
inac |
Total inactive pages |
4 |
Pages wired down |
wire |
Total pages wired into memory (cannot be paged out) |
5 |
Translation Faults |
faults |
Number of times vm_fault has been called |
6 |
Pages copy-on-write |
copy |
Number of faults that resulted in a page being copied |
7 |
Pages zero filled |
zerofill |
Number of pages that have been zero-filled |
8 |
Pages Reactivated |
reactive |
Number of pages reclassified from inactive to active |
9 |
Pageins |
pagein |
Number ... |
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