| ||sar - system activity reporter
| ||sar [-aAbcdgkmpqruvwy] [-o filename] t [n]
| ||sar [-aAbcdgkmpqruvwy] [-e time] [-f filename] [-i sec] [-s time]
In the first instance, sar samples cumulative activity counters in the operating system at n intervals of t seconds, where t should be 5 or greater. If t is specified with more than one option, all headers are printed together and the output may be difficult to read.
(If the sampling interval is less than 5, the activity of sar itself may affect the sample.) If the -o option is specified, it saves the samples in filename in binary format. The default value of n is 1.
In the second instance, no sampling interval is specified. sar extracts data from a previously recorded filename, either the one specified by the -f option or, by default, the standard system activity daily data file /var/adm/sa/sadd for the current day dd. The starting
and ending times of the report can be bounded using the -e and -s arguments with time specified in the form hh[:mm[:ss]]. The -i option selects records at sec second intervals. Otherwise, all intervals found in the data file are reported.
The following options modify the subsets of information reported by sar.
- Report use of file access system routines: iget/s, namei/s, dirblk/s
- Report all data. Equivalent to -abcdgkmpqruvwy.
- Report buffer activity:
- bread/s, bwrit/s
per second of data between system buffers and disk or other block devices.
- lread/s, lwrit/s
- accesses of system buffers.
- %rcache, %wcache
- cache hit ratios, that is, (1-bread/lread) as a percentage.
- pread/s, pwrit/s
- transfers using raw (physical) device mechanism.
- Report system calls:
- system calls of all
- sread/s, swrit/s, fork/s, exec/s
- specific system calls.
- rchar/s, wchar/s
- characters transferred by read and write system calls. No incoming or outgoing exec(2) and fork(2) calls are reported.
- Report activity for each block device (for example, disk or tape drive) with the exception of XDC disks and
tape drives. When data is displayed, the device specification dsk- is generally used to represent a disk drive. The device specification used to represent a tape drive is machine
dependent. The activity data reported is:
- %busy, avque
- portion of time device was busy servicing a transfer request,
average number of requests outstanding during that time.
- read/s, write/s, blks/s
- number of read/write transfers from or to device, number of bytes transferred in 512-byte units.
- average wait time in milliseconds.
- average service time in milliseconds.
For more general system statistics, use iostat(1M), sar(1M), or vmstat(1M).
See System Administration Guide: Basic Administration for naming conventions for disks.
- -e time
- Select data up to time. Default is 18:00.
- -f filename
- Use filename as the data source for sar. Default is the current
daily data file /var/adm/sa/sadd.
- Report paging activities:
- page-out requests per
- pages paged-out per second.
- pages per second placed on the free list by the page stealing daemon.
- pages per second scanned by the page stealing daemon.
- the percentage of UFS inodes taken off the freelist by iget which had reusable pages associated with them. These pages
are flushed and cannot be reclaimed by processes. Thus, this is the percentage of igets with page flushes.
- -i sec
- Select data at intervals as close as possible to sec seconds.
- Report kernel memory allocation (KMA) activities:
- sml_mem, alloc, fail
- information about the memory pool reserving and allocating space for small requests: the amount of memory in bytes KMA has for the small pool, the number
of bytes allocated to satisfy requests for small amounts of memory, and the number of requests for small amounts of memory that were not satisfied (failed).
- lg_mem, alloc, fail
- information for the large memory pool (analogous to the information for the small memory pool).
- ovsz_alloc, fail
- the amount of memory allocated for oversize requests and the number of oversize requests which could not be satisfied (because oversized memory
is allocated dynamically, there is not a pool).
- Report message and semaphore activities:
- msg/s, sema/s
- primitives per second.
- -o filename
- Save samples in file, filename, in binary format.
- Report paging activities:
- page faults per second
that are satisfied by reclaiming a page currently in memory (attaches per second).
- page-in requests per second.
- pages paged-in per second.
- page faults from protection errors per second (illegal access to page) or "copy-on-writes".
- address translation page faults per second (valid page not in memory).
- faults per second caused by software lock requests requiring physical I/O.
- Report average queue length while occupied, and percent of time occupied:
- runq-sz, %runocc
- run queue of processes in memory and runnable.
- swpq-sz, %swpocc
- these are no longer reported by sar.
- Report unused memory pages and disk blocks:
- average pages available to user processes.
- disk blocks available for page swapping.
- -s time
- Select data later than time in the form hh[:mm].
Default is 08:00.
- Report CPU utilization (the default):
- %usr, %sys, %wio, %idle
- portion of time running in user mode, running in system mode, idle with some process waiting for block I/O, and otherwise idle.
- Report status of process, i-node, file tables:
- proc-sz, inod-sz, file-sz,
- entries/size for each table, evaluated once at sampling point.
- overflows that occur between sampling points for each table.
- Report system swapping and switching activity:
- swpin/s, swpot/s, bswin/s,
- number of transfers and number of 512-byte units transferred for swapins and swapouts (including initial loading of some programs).
- process switches.
- Report TTY device activity:
- rawch/s, canch/s, outch/s
- input character rate, input character rate processed by canon, output character rate.
- rcvin/s, xmtin/s, mdmin/s
- receive, transmit and modem interrupt rates.
| ||Example 1. Viewing system activity
Example 2. Watching system activity evolve
To see today's CPU activity so far:
Example 3. Reviewing disk and tape activity
To watch CPU activity evolve for 10 minutes and save data:
example% sar -o temp 60 10
To later review disk and tape activity from that period:
- daily data file, where dd
are digits representing the day of the month
See attributes(5) for descriptions of the following
|ATTRIBUTE TYPE||ATTRIBUTE VALUE
The sum of CPU utilization might vary slightly from 100
because of rounding errors in the production of a percentage figure.