Solaris 7 Only

A downloadable extended vmstat command for Solaris 7: memstat

Solaris 8 onwards

These statistics are available in Solaris 8 using vmstat -p

Statistics from the memstat and and vmstat -p commands

Counter	Description
free	The amount of free memory as reported by vmstat , which reports the combined size of the cache list and free list. Free memory on Solaris 7 may contain some of the file system cache.
re	Page reclaims -- The kilobytes of pages reclaimed since the last sample. Some of the file system cache is in the free list, and when a file page is reused and removed from the free list, a reclaim occurs. File pages in the free list can be either regular files or executable/library pages.
mf	Minor faults -- The kilobytes of pages attached to an address space since the last sample. If the page is already in memory, then a minor fault simply reestablishes the mapping to it
pi	Page-ins -- The kilobytes of pages paged in since the last sample. A page-in occurs whenever a page is brought back in from the swap device or brought from a file system into the file system cache.
po	Page-outs -- The kilobytes of pages paged out and freed. A page-out will be counted whenever a page is written and freed, often as a result of the pageout scanner, fsflush, or file close.
fr	Page-frees -- The kilobytes of pages that have been freed by either the page scanner or by the file system (free-behind).
de	The precalculated anticipated short-term memory shortfall. Used by the page scanner to free ahead enough pages to satisfy requests.
sr	The kilobytes of pages scanned by the page scanner per second.
epi	Executable and library page-ins -- The kilobytes of pages from executable or shared library files paged in since the last sample. An executable/library page-in occurs whenever a page for the executable binary or shared library is brought back in from the file system.
epo	Executable and library page-outs. Should be zero.
epf	Executable and library page-frees -- The number of executable and library pages that have been freed by the page scanner.
api	Anonymous memory page-ins -- The number of anonymous (application heap and stack) pages paged in from the swap device since the last sample.
apo	Anonymous memory page-outs -- The number of anonymous (application heap and stack) pages paged out to the swap device since the last sample.
apf	Anonymous memory page-frees -- The number of anonymous (application heap and stack) pages that have been freed, after they have been paged out.
fpi	Regular file page-ins -- The kilobytes of pages from regular files paged in since the last sample. A file page-in occurs whenever a page for a regular file is read in from the file system (part of the normal file system read process).
fpo	Regular file page-outs -- The number of regular file pages that were paged out and freed, usually as a result of being paged out by the page scanner or by write free-behind (when free memory is less than lotsfree + pages_before_pager ).
fpf	Regular file page-frees -- The number of regular file pages that were freed, usually as a result of being paged out by the page scanner or by write free-behind (when free memory is less than lotsfree + pages_before_pager ).