| -f |
Reports the number of forks since system startup. |
| -i |
Displays the number of interrupts taken by each
device since system startup. Note: The -I, -t, -w, and -l flags
are ignored when they are specified with the -i flag.
|
| -s |
Writes to standard output the contents of the
sum structure, which contains an absolute count of paging events since
system initialization. The -s flag can only be used with the
-v flag. These events are described as follows: - address translation faults
- Incremented for each occurrence of an address translation page
fault. I/O may or may not be required to resolve the page fault. Storage
protection page faults (lock misses) are not included in this count.
- page ins
- Incremented for each page read in by the virtual memory manager.
The count is incremented for page ins from page space and file space.
Along with the page out statistic, this represents the total amount
of real I/O initiated by the virtual memory manager.
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| |
- page outs
- Incremented for each page written out by the virtual memory manager.
The count is incremented for page outs to page space and for page
outs to file space. Along with the page in statistic, this represents
the total amount of real I/O initiated by the virtual memory manager.
- paging space page ins
- Incremented for VMM initiated page ins from paging space only.
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- total reclaims
- Incremented when an address translation fault can be satisfied
without initiating a new I/O request. This can occur if the page has
been previously requested by VMM, but the I/O has not yet completed;
or if the page was pre-fetched by VMM's read-ahead algorithm, but
was hidden from the faulting segment; or if the page has been put
on the free list and has not yet been reused
- zero-filled page faults
- Incremented if the page fault is to working storage and can be
satisfied by assigning a frame and zero-filling it.
- executable-filled page faults
- Incremented for each instruction page fault.
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- pages examined by the clock
- VMM uses a clock-algorithm to implement a pseudo least recently
used (lru) page replacement scheme. Pages are aged by being examined
by the clock. This count is incremented for each page examined by
the clock.
- revolutions of the clock hand
- Incremented for each VMM clock revolution (that is, after each
complete scan of memory).
- pages freed by the clock
- Incremented for each page the clock algorithm selects to free
from real memory.
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- backtracks
- Incremented for each page fault that occurs while resolving a
previous page fault.
- free frame waits
- Incremented each time a process is waited by VMM while free frames
are gathered.
- extend XPT waits
- Incremented each time a process is waited by VMM due to a commit
in progress for the segment being accessed.
|
| -s (continued) |
- pending I/O waits
- Incremented each time a process is waited by VMM for a page-in
I/O to complete.
- start I/Os
- Incremented for each read or write I/O request initiated by VMM.
This count should equal the sum of page-ins and page-outs.
- iodones
- Incremented at the completion of each VMM I/O request.
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- CPU context switches
- Incremented for each CPU context switch (dispatch of a new process).
- device interrupts
- Incremented on each hardware interrupt
- software interrupts
- Incremented on each software interrupt. A software interrupt is
a machine instruction similar to a hardware interrupt that saves some
state and branches to a service routine. System calls are implemented
with software interrupt instructions that branch to the system call
handler routine.
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- decrementer interrupts
- Incremented on each decrementer interrupt.
- mpc send interrupts
- Incremented on each mpc send interrupt
- mpc receive interrupts
- Incremented on each mpc receive interrupt
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- phanton interrupts
- Incremented on each phantom interrupt
- traps
- Not maintained by the operating system.
- syscalls
- Incremented for each system call.
|
| -I |
Displays I/O oriented view with the new columns
of output, p under heading kthr,and columns fi and fo under
heading page instead of the columns re and cy in the
page heading. |
| -t |
Prints the time-stamp next to each line of output
of vmstat. The time-stamp is displayed in theHH:MM:SS format.
Note: Time stamp will not be printed if -f, -s, or -i flags
are specified.
|
| -v |
Writes to standard output various statistics
maintained by the Virtual Memory Manager. The -v flag can only
be used with the -s flag. Possible values: - memory pages
- Size of real memory in number of 4 KB pages.
- lruable pages
- Number of 4 KB pages considered for replacement. This number excludes
the pages used for VMM internal pages, and the pages used for the
pinned part of the kernel text.
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- free pages
- Number of free 4 KB pages.
- memory pools
- Tuning parameter (managed using vmo) specifying the number
of memory pools.
- pinned pages
- Number of pinned 4 KB pages
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- maxpin percentage
- Tuning parameter (managed using vmo) specifying the percentage
of real memory which can be pinned.
- minperm percentage
- Tuning parameter (managed using vmo) in percentage of real
memory. This specifies the point below which file pages are protected
from the re-page algorithm.
- maxperm percentage
- Tuning parameter (managed using vmo) in percentage of real
memory. This specifies the point above which the page stealing algorithm
steals only file pages.
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- numperm percentage
- Percentage of memory currently used by the file cache.
- file pages
- Number of 4 KB pages currently used by the file cache.
- compressed percentage
- Percentage of memory used by compressed pages.
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- compressed pages
- Number of compressed memory pages.
- numclient percentage
- Percentage of memory occupied by client pages.
- maxclient percentage
- Tuning parameter (managed using vmo) specifying the maximum percentage
of memory which can be used for client pages.
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| -v (continued) |
- client pages
- Number of client pages.
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- remote pageouts scheduled
- Number of pageouts scheduled for the client file systems.
- pending disk I/Os blocked with no pbuf
- Number of pending disk I/O requests blocked because no pbuf was
available. Pbufs are pinned memory buffers used to hold I/O requests
at the logical volume manager layer.
- paging space I/Os blocked with no psbuf
- Number of paging space I/O requests blocked because no psbuf was
available. Psbufs are pinned memory buffers used to hold I/O requests
at the virtual memory manager layer.
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- filesystem I/Os blocked with no fsbuf
- Number of file system I/O requests blocked because no fsbuf was
available. Fsbuf are pinned memory buffers used to hold I/O requests
in the file system layer.
- client filesystem I/Os blocked with no fsbuf
- Number of client file system I/O requests blocked because no fsbuf
was available. NFS (Network File System) and VxFS (Veritas) are client
file systems. Fsbuf are pinned memory buffers used to hold I/O requests
in the file system layer.
- external pager filesystem I/Os blocked with no fsbuf
- Number of external pager client file system I/O requests blocked
because no fsbuf was available. JFS2 is an external pager client file
system. Fsbuf are pinned memory buffers used to hold I/O requests
in the file system layer.
|
| -w |
Display the report in wide mode |
| -l |
Displays an additional "large-page" section
with the alp and flp columns. |
| -p pagesize |
Appends the VMM statistics for the specified
page size to the regular vmstat output. |
| -P pagesize |
Displays only the VMM statistics which are relevant
for the specified page size. |
| Interval |
Specifies the amount of time in seconds between
each report. |
| Count |
Determines the number of reports generated and
the number of seconds apart. |
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