Use the sar command to perform the following tasks:
Organize and view data about system activity.
Access system activity data on a special request basis.
Generate automatic reports to measure and monitor system performance, as well as special request reports to pinpoint specific performance problems. For information on how to set up the sar command to run on your system, as well as a description of these tools, see Collecting System Activity Data Automatically (sar).
For a detailed description of this command, see the sar(1) man page.
Display file access operation statistics with the sar -a command.
$ sar -a SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:00 iget/s namei/s dirbk/s 01:00:00 0 3 0 02:00:00 0 3 0 03:00:00 0 3 0 04:00:00 0 3 0 05:00:00 0 3 0 06:00:00 0 3 0 07:00:00 0 3 0 08:00:00 0 3 0 08:20:01 0 3 0 08:40:00 0 3 0 09:00:00 0 3 0 09:20:01 0 10 0 09:40:01 0 1 0 10:00:02 0 5 0 Average 0 4 0 |
The following list describes the field names and description of operating system routines that are reported by the sar -a command.
The number of requests made for inodes that were not in the directory name look-up cache (DNLC).
The number of file system path searches per second. If namei does not find a directory name in the DNLC, it calls iget to get the inode for either a file or directory. Hence, most igets are the result of DNLC misses.
The number of directory block reads issued per second.
The larger the reported values for these operating system routines, the more time the kernel is spending to access user files. The amount of time reflects how heavily programs and applications are using the file systems. The -a option is helpful for viewing how disk-dependent an application is.
Display buffer activity statistics with the sar -b command.
The buffer is used to cache metadata. Metadata includes inodes, cylinder group blocks, and indirect blocks.
$ sar -b 00:00:00 bread/s lread/s %rcache bwrit/s lwrit/s %wcache pread/s pwrit/s 01:00:00 0 0 100 0 0 55 0 0 |
The following example of sar -b command output shows that the %rcache and %wcache buffers are not causing any slowdowns. All the data is within acceptable limits.
$ sar -b SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:04 bread/s lread/s %rcache bwrit/s lwrit/s %wcache pread/s pwrit/s 01:00:00 0 0 100 0 0 94 0 0 02:00:01 0 0 100 0 0 94 0 0 03:00:00 0 0 100 0 0 92 0 0 04:00:00 0 1 100 0 1 94 0 0 05:00:00 0 0 100 0 0 93 0 0 06:00:00 0 0 100 0 0 93 0 0 07:00:00 0 0 100 0 0 93 0 0 08:00:00 0 0 100 0 0 93 0 0 08:20:00 0 1 100 0 1 94 0 0 08:40:01 0 1 100 0 1 93 0 0 09:00:00 0 1 100 0 1 93 0 0 09:20:00 0 1 100 0 1 93 0 0 09:40:00 0 2 100 0 1 89 0 0 10:00:00 0 9 100 0 5 92 0 0 10:20:00 0 0 100 0 0 68 0 0 10:40:00 0 1 98 0 1 70 0 0 11:00:00 0 1 100 0 1 75 0 0 Average 0 1 100 0 1 91 0 0 |
The following table describes the buffer activities that are displayed by the -b option.
Field Name |
Description |
---|---|
bread/s |
Average number of reads per second that are submitted to the buffer cache from the disk |
lread/s |
Average number of logical reads per second from the buffer cache |
%rcache |
Fraction of logical reads that are found in the buffer cache (100 % minus the ratio of bread/s to lread/s) |
bwrit/s |
Average number of physical blocks (512 blocks) that are written from the buffer cache to disk, per second |
lwrit/s |
Average number of logical writes to the buffer cache, per second |
%wcache |
Fraction of logical writes that are found in the buffer cache (100 % minus the ratio of bwrit/s to lwrit/s) |
pread/s |
Average number of physical reads, per second, that use character device interfaces |
pwrit/s |
Average number of physical write requests, per second, that use character device interfaces |
The most important entries are the cache hit ratios %rcache and %wcache. These entries measure the effectiveness of system buffering. If %rcache falls below 90 percent, or if %wcache falls below 65 percent, it might be possible to improve performance by increasing the buffer space.
Display system call statistics by using the sar -c command.
$ sar -c 00:00:00 scall/s sread/s swrit/s fork/s exec/s rchar/s wchar/s 01:00:00 38 2 2 0.00 0.00 149 120 |
The following example shows output from the sar -c command.
$ sar -c SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:04 scall/s sread/s swrit/s fork/s exec/s rchar/s wchar/s 01:00:00 89 14 9 0.01 0.00 2906 2394 02:00:01 89 14 9 0.01 0.00 2905 2393 03:00:00 89 14 9 0.01 0.00 2908 2393 04:00:00 90 14 9 0.01 0.00 2912 2393 05:00:00 89 14 9 0.01 0.00 2905 2393 06:00:00 89 14 9 0.01 0.00 2905 2393 07:00:00 89 14 9 0.01 0.00 2905 2393 08:00:00 89 14 9 0.01 0.00 2906 2393 08:20:00 90 14 9 0.01 0.01 2914 2395 08:40:01 90 14 9 0.01 0.00 2914 2396 09:00:00 90 14 9 0.01 0.01 2915 2396 09:20:00 90 14 9 0.01 0.01 2915 2396 09:40:00 880 207 156 0.08 0.08 26671 9290 10:00:00 2020 530 322 0.14 0.13 57675 36393 10:20:00 853 129 75 0.02 0.01 10500 8594 10:40:00 2061 524 450 0.08 0.08 579217 567072 11:00:00 1658 404 350 0.07 0.06 1152916 1144203 Average 302 66 49 0.02 0.01 57842 55544 |
The following table describes the system call categories that are reported by the -c option. Typically, reads and writes account for about half of the total system calls. However, the percentage varies greatly with the activities that are being performed by the system.
Field Name |
Description |
---|---|
scall/s |
The number of all types of system calls per second, which is generally about 30 per second on a system with 4 to 6 users. |
sread/s |
The number of read system calls per second. |
swrit/s |
The number of write system calls per second. |
fork/s |
The number of fork system calls per second, which is about 0.5 per second on a system with 4 to 6 users. This number increases if shell scripts are running. |
exec/s |
The number of exec system calls per second. If exec/s divided by fork/s is greater than 3, look for inefficient PATH variables. |
rchar/s |
The number of characters (bytes) transferred by read system calls per second. |
wchar/s |
The number of characters (bytes) transferred by write system calls per second. |
Display disk activity statistics with the sar -d command.
$ sar -d 00:00:00 device %busy avque r+w/s blks/s avwait avserv |
This abbreviated example illustrates the output from the sar -d command.
$ sar -d SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 12:36:32 device %busy avque r+w/s blks/s avwait avserv 12:40:01 dad1 15 0.7 26 399 18.1 10.0 dad1,a 15 0.7 26 398 18.1 10.0 dad1,b 0 0.0 0 1 1.0 3.0 dad1,c 0 0.0 0 0 0.0 0.0 dad1,h 0 0.0 0 0 0.0 6.0 fd0 0 0.0 0 0 0.0 0.0 nfs1 0 0.0 0 0 0.0 0.0 nfs2 1 0.0 1 12 0.0 13.2 nfs3 0 0.0 0 2 0.0 1.9 nfs4 0 0.0 0 0 0.0 7.0 nfs5 0 0.0 0 0 0.0 57.1 nfs6 1 0.0 6 125 4.3 3.2 nfs7 0 0.0 0 0 0.0 6.0 sd1 0 0.0 0 0 0.0 5.4 ohci0,bu 0 0.0 0 0 0.0 0.0 ohci0,ct 0 0.0 0 0 0.0 0.0 ohci0,in 0 0.0 7 0 0.0 0.0 ohci0,is 0 0.0 0 0 0.0 0.0 ohci0,to 0 0.0 7 0 0.0 0.0 |
The following table describes the disk device activities that are reported by the -d option.
Field Name |
Description |
---|---|
device |
Name of the disk device that is being monitored. |
%busy |
Portion of time the device was busy servicing a transfer request. |
avque |
Average number of requests during the time the device was busy servicing a transfer request. |
r+w/s |
Number of read-and-write transfers to the device, per second. |
blks/s |
Number of 512-byte blocks that are transferred to the device, per second. |
avwait |
Average time, in milliseconds, that transfer requests wait idly in the queue. This time is measured only when the queue is occupied. |
avserv |
Average time, in milliseconds, for a transfer request to be completed by the device. For disks, this value includes seek times, rotational latency times, and data transfer times. |
Note that queue lengths and wait times are measured when something is in the queue. If %busy is small, large queues and service times probably represent the periodic efforts by the system to ensure that altered blocks are promptly written to the disk.
Use the sar -g command to display page-out and memory freeing activities in averages.
$ sar -g 00:00:00 pgout/s ppgout/s pgfree/s pgscan/s %ufs_ipf 01:00:00 0.00 0.00 0.00 0.00 0.00 |
The output displayed by the sar -g command is a good indicator of whether more memory might be needed. Use the ps -elf command to show the number of cycles that are used by the page daemon. A high number of cycles, combined with high values for the pgfree/s and pgscan/s fields, indicates a memory shortage.
The sar -g command also shows whether inodes are being recycled too quickly and causing a loss of reusable pages.
The following example shows output from the sar -g command.
$ sar -g SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:00 pgout/s ppgout/s pgfree/s pgscan/s %ufs_ipf 01:00:00 0.00 0.00 0.00 0.00 0.00 02:00:00 0.01 0.01 0.01 0.00 0.00 03:00:00 0.00 0.00 0.00 0.00 0.00 04:00:00 0.00 0.00 0.00 0.00 0.00 05:00:00 0.00 0.00 0.00 0.00 0.00 06:00:00 0.00 0.00 0.00 0.00 0.00 07:00:00 0.00 0.00 0.00 0.00 0.00 08:00:00 0.00 0.00 0.00 0.00 0.00 08:20:01 0.00 0.00 0.00 0.00 0.00 08:40:00 0.00 0.00 0.00 0.00 0.00 09:00:00 0.00 0.00 0.00 0.00 0.00 09:20:01 0.05 0.52 1.62 10.16 0.00 09:40:01 0.03 0.44 1.47 4.77 0.00 10:00:02 0.13 2.00 4.38 12.28 0.00 10:20:03 0.37 4.68 12.26 33.80 0.00 Average 0.02 0.25 0.64 1.97 0.00 |
The following table describes the output from the -g option.
Field Name |
Description |
---|---|
pgout/s |
The number of page-out requests per second. |
ppgout/s |
The actual number of pages that are paged-out, per second. A single page-out request might involve paging-out multiple pages. |
pgfree/s |
The number of pages, per second, that are placed on the free list. |
pgscan/s |
The number of pages, per second, that are scanned by the page daemon. If this value is high, the page daemon is spending a lot of time checking for free memory. This situation implies that more memory might be needed. |
%ufs_ipf |
The percentage of ufs inodes taken off the free list by iget that had reusable pages associated with them. These pages are flushed and cannot be reclaimed by processes. Thus, this field represents the percentage of igets with page flushes. A high value indicates that the free list of inodes is page-bound, and that the number of ufs inodes might need to be increased. |
The KMA allows a kernel subsystem to allocate and free memory, as needed.
Rather than statically allocating the maximum amount of memory it is expected to require under peak load, the KMA divides requests for memory into three categories:
Small (less than 256 bytes)
Large (512 bytes to 4 Kbytes)
Oversized (greater than 4 Kbytes)
The KMA keeps two pools of memory to satisfy small requests and large requests. The oversized requests are satisfied by allocating memory from the system page allocator.
If you are checking a system that is being used to write drivers or STREAMS that use KMA resources, then the sar -k command will likely prove useful. Otherwise, you will probably not need the information it provides. Any driver or module that uses KMA resources, but does not specifically return the resources before it exits, can create a memory leak. A memory leak causes the amount of memory that is allocated by KMA to increase over time. Thus, if the alloc fields of the sar -k command increase steadily over time, there might be a memory leak. Another indication of a memory leak is failed requests. If this problem occurs, a memory leak has probably caused KMA to be unable to reserve and allocate memory.
If it appears that a memory leak has occurred, you should check any drivers or STREAMS that might have requested memory from KMA and not returned it.
Use the sar -k command to report on the following activities of the Kernel Memory Allocator (KMA).
$ sar -k 00:00:00 sml_mem alloc fail lg_mem alloc fail ovsz_alloc fail 01:00:00 2523136 1866512 0 18939904 14762364 0 360448 0 02:00:02 2523136 1861724 0 18939904 14778748 0 360448 0 |
The following is an abbreviated example of sar -k output.
$ sar -k SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:04 sml_mem alloc fail lg_mem alloc fail ovsz_alloc fail 01:00:00 6119744 4852865 0 60243968 54334808 156 9666560 0 02:00:01 6119744 4853057 0 60243968 54336088 156 9666560 0 03:00:00 6119744 4853297 0 60243968 54335760 156 9666560 0 04:00:00 6119744 4857673 0 60252160 54375280 156 9666560 0 05:00:00 6119744 4858097 0 60252160 54376240 156 9666560 0 06:00:00 6119744 4858289 0 60252160 54375608 156 9666560 0 07:00:00 6119744 4858793 0 60252160 54442424 156 9666560 0 08:00:00 6119744 4858985 0 60252160 54474552 156 9666560 0 08:20:00 6119744 4858169 0 60252160 54377400 156 9666560 0 08:40:01 6119744 4857345 0 60252160 54376880 156 9666560 0 09:00:00 6119744 4859433 0 60252160 54539752 156 9666560 0 09:20:00 6119744 4858633 0 60252160 54410920 156 9666560 0 09:40:00 6127936 5262064 0 60530688 55619816 156 9666560 0 10:00:00 6545728 5823137 0 62996480 58391136 156 9666560 0 10:20:00 6545728 5758997 0 62996480 57907400 156 9666560 0 10:40:00 6734144 6035759 0 64389120 59743064 156 10493952 0 11:00:00 6996288 6394872 0 65437696 60935936 156 10493952 0 Average 6258044 5150556 0 61138340 55609004 156 9763900 0 |
The following table describes the output from the -k option.
Field Name |
Description |
---|---|
sml_mem |
The amount of memory, in bytes, that the KMA has available in the small memory request pool. In this pool, here a small request is less than 256 bytes. |
alloc |
The amount of memory, in bytes, that the KMA has allocated from its small memory request pool to small memory requests. |
fail |
The number of requests for small amounts of memory that failed. |
lg_mem |
The amount of memory, in bytes, that the KMA has available in the large memory request pool. In this pool, a large request is from 512 bytes to 4 Kbytes. |
alloc |
The amount of memory, in bytes, that the KMA has allocated from its large memory request pool to large memory requests. |
fail |
The number of failed requests for large amounts of memory. |
ovsz_alloc |
The amount of memory that is allocated for oversized requests, which are requests that are greater than 4 Kbytes. These requests are satisfied by the page allocator. Thus, there is no pool. |
fail |
The number of failed requests for oversized amounts of memory. |
Use the sar -m command to report interprocess communication activities.
$ sar -m 00:00:00 msg/s sema/s 01:00:00 0.00 0.00 |
These figures are usually zero (0.00), unless you are running applications that use messages or semaphores.
The following list describes the output from the -m option.
The number of message operations (sends and receives) per second
The number of semaphore operations per second
The following abbreviated example shows output from the sar -m command.
$ sar -m SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:00 msg/s sema/s 01:00:00 0.00 0.00 02:00:02 0.00 0.00 03:00:00 0.00 0.00 04:00:00 0.00 0.00 05:00:01 0.00 0.00 06:00:00 0.00 0.00 Average 0.00 0.00 |
Use the sar -p command to report page-in activity, which includes protection and translation faults.
$ sar -p 00:00:00 atch/s pgin/s ppgin/s pflt/s vflt/s slock/s 01:00:00 0.07 0.00 0.00 0.21 0.39 0.00 |
The following example shows output from the sar -p command.
$ sar -p SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:04 atch/s pgin/s ppgin/s pflt/s vflt/s slock/s 01:00:00 0.09 0.00 0.00 0.78 2.02 0.00 02:00:01 0.08 0.00 0.00 0.78 2.02 0.00 03:00:00 0.09 0.00 0.00 0.81 2.07 0.00 04:00:00 0.11 0.01 0.01 0.86 2.18 0.00 05:00:00 0.08 0.00 0.00 0.78 2.02 0.00 06:00:00 0.09 0.00 0.00 0.78 2.02 0.00 07:00:00 0.08 0.00 0.00 0.78 2.02 0.00 08:00:00 0.09 0.00 0.00 0.78 2.02 0.00 08:20:00 0.11 0.00 0.00 0.87 2.24 0.00 08:40:01 0.13 0.00 0.00 0.90 2.29 0.00 09:00:00 0.11 0.00 0.00 0.88 2.24 0.00 09:20:00 0.10 0.00 0.00 0.88 2.24 0.00 09:40:00 2.91 1.80 2.38 4.61 17.62 0.00 10:00:00 2.74 2.03 3.08 8.17 21.76 0.00 10:20:00 0.16 0.04 0.04 1.92 2.96 0.00 10:40:00 2.10 2.50 3.42 6.62 16.51 0.00 11:00:00 3.36 0.87 1.35 3.92 15.12 0.00 Average 0.42 0.22 0.31 1.45 4.00 0.00 |
The following table describes the reported statistics from the -p option.
Field Name |
Description |
---|---|
atch/s |
The number of page faults, per second, that are satisfied by reclaiming a page currently in memory (attaches per second). Instances include reclaiming an invalid page from the free list and sharing a page of text that is currently being used by another process. An example is two or more processes that are accessing the same program text. |
pgin/s |
The number of times, per second, that file systems receive page-in requests. |
ppgin/s |
The number of pages paged in, per second. A single page-in request, such as a soft-lock request (see slock/s) or a large block size, might involve paging-in multiple pages. |
pflt/s |
The number of page faults from protection errors. Instances of protection faults indicate illegal access to a page and “copy-on-writes.” Generally, this number consists primarily of “copy-on-writes.” |
vflt/s |
The number of address translation page faults, per second. These faults are known as validity faults. Validity faults occur when a valid process table entry does not exist for a given virtual address. |
slock/s |
The number of faults, per second, caused by software lock requests that require physical I/O. An example of the occurrence of a soft-lock request is the transfer of data from a disk to memory. The system locks the page that is to receive the data so that the page cannot be claimed and used by another process. |
Use the sar -q command to report the following information:
The Average queue length while the queue is occupied.
The percentage of time that the queue is occupied.
$ sar -q 00:00:00 runq-sz %runocc swpq-sz %swpocc |
The following list describes the output from the -q option.
The number of kernel threads in memory that are waiting for a CPU to run. Typically, this value should be less than 2. Consistently higher values mean that the system might be CPU-bound.
The percentage of time that the dispatch queues are occupied.
No longer reported by the sar command.
No longer reported by the sar command.
The following example shows output from the sar -q command. If the %runocc value is high (greater than 90 percent) and the runq-sz value is greater than 2, the CPU is heavily loaded and response is degraded. In this case, additional CPU capacity might be required to obtain acceptable system response.
$ sar -q SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:04 runq-sz %runocc swpq-sz %swpocc 01:00:00 1.0 0 0.0 0 02:00:01 1.3 0 0.0 0 03:00:00 1.0 0 0.0 0 04:00:00 1.0 0 0.0 0 05:00:00 1.0 0 0.0 0 06:00:00 2.0 0 0.0 0 07:00:00 0.0 0 0.0 0 08:00:00 1.0 0 0.0 0 08:20:00 1.0 0 0.0 0 08:40:01 2.0 0 0.0 0 09:00:00 0.0 0 0.0 0 09:20:00 1.0 0 0.0 0 09:40:00 1.2 2 0.0 0 10:00:00 1.2 2 0.0 0 10:20:00 1.0 1 0.0 0 10:40:00 1.3 9 0.0 0 11:00:00 1.2 7 0.0 0 Average 1.2 1 0.0 0 |
Use the sar -r command to report the number of memory pages and swap-file disk blocks that are currently unused.
$ sar -r 00:00:00 freemem freeswap 01:00:00 2135 401922 |
The following list describes the output from the -r option.
The average number of memory pages that are available to user processes over the intervals sampled by the command. Page size is machine-dependent.
The number of 512-byte disk blocks that are available for page swapping.
The following example shows output from the sar -r command.
$ sar -r SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:04 freemem freeswap 01:00:00 44717 1715062 02:00:01 44733 1715496 03:00:00 44715 1714746 04:00:00 44751 1715403 05:00:00 44784 1714743 06:00:00 44794 1715186 07:00:00 44793 1715159 08:00:00 44786 1714914 08:20:00 44805 1715576 08:40:01 44797 1715347 09:00:00 44761 1713948 09:20:00 44802 1715478 09:40:00 41770 1682239 10:00:00 35401 1610833 10:20:00 34295 1599141 10:40:00 33943 1598425 11:00:00 30500 1561959 Average 43312 1699242 |
Use the sar -u command to display CPU utilization statistics.
$ sar -u 00:00:00 %usr %sys %wio %idle 01:00:00 0 0 0 100 |
The sar command without any options is equivalent to the sar -u command. At any given moment, the processor is either busy or idle. When busy, the processor is in either user mode or system mode. When idle, the processor is either waiting for I/O completion or “sitting still” with no work to do.
The following list describes output from the -u option.
Lists the percentage of time that the processor is in user mode
Lists the percentage of time that the processor is in system mode
Lists the percentage of time that the processor is idle and waiting for I/O completion
Lists the percentage of time that the processor is idle and not waiting for I/O
A high %wio value generally means that a disk slowdown has occurred.
The following example shows output from the sar -u command.
$ sar -u SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:04 %usr %sys %wio %idle 01:00:00 0 0 0 100 02:00:01 0 0 0 100 03:00:00 0 0 0 100 04:00:00 0 0 0 100 05:00:00 0 0 0 100 06:00:00 0 0 0 100 07:00:00 0 0 0 100 08:00:00 0 0 0 100 08:20:00 0 0 0 99 08:40:01 0 0 0 99 09:00:00 0 0 0 99 09:20:00 0 0 0 99 09:40:00 4 1 0 95 10:00:00 4 2 0 94 10:20:00 1 1 0 98 10:40:00 18 3 0 79 11:00:00 25 3 0 72 Average 2 0 0 98 |
Use the sar -v command to report the status of the process table, inode table, file table, and shared memory record table.
$ sar -v 00:00:00 proc-sz ov inod-sz ov file-sz ov lock-sz 01:00:00 43/922 0 2984/4236 0 322/322 0 0/0 |
The following abbreviated example shows output from the sar -v command. This example shows that all tables are large enough to have no overflows. These tables are all dynamically allocated based on the amount of physical memory.
$ sar -v SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:04 proc-sz ov inod-sz ov file-sz ov lock-sz 01:00:00 69/8010 0 3476/34703 0 0/0 0 0/0 02:00:01 69/8010 0 3476/34703 0 0/0 0 0/0 03:00:00 69/8010 0 3476/34703 0 0/0 0 0/0 04:00:00 69/8010 0 3494/34703 0 0/0 0 0/0 05:00:00 69/8010 0 3494/34703 0 0/0 0 0/0 06:00:00 69/8010 0 3494/34703 0 0/0 0 0/0 07:00:00 69/8010 0 3494/34703 0 0/0 0 0/0 08:00:00 69/8010 0 3494/34703 0 0/0 0 0/0 08:20:00 69/8010 0 3494/34703 0 0/0 0 0/0 08:40:01 69/8010 0 3494/34703 0 0/0 0 0/0 09:00:00 69/8010 0 3494/34703 0 0/0 0 0/0 09:20:00 69/8010 0 3494/34703 0 0/0 0 0/0 09:40:00 74/8010 0 3494/34703 0 0/0 0 0/0 10:00:00 75/8010 0 4918/34703 0 0/0 0 0/0 10:20:00 72/8010 0 4918/34703 0 0/0 0 0/0 10:40:00 71/8010 0 5018/34703 0 0/0 0 0/0 11:00:00 77/8010 0 5018/34703 0 0/0 0 0/0 |
Output from the -v option is described in the following table.
Field Name |
Description |
---|---|
proc-sz |
The number of process entries (proc structures) that are currently being used, or allocated, in the kernel. |
inod-sz |
The total number of inodes in memory compared to the maximum number of inodes that are allocated in the kernel. This number is not a strict high watermark. The number can overflow. |
file-sz |
The size of the open system file table. The sz is given as 0, because space is allocated dynamically for the file table. |
ov |
The overflows that occur between sampling points for each table. |
lock-sz |
The number of shared memory record table entries that are currently being used, or allocated, in the kernel. The sz is given as 0 because space is allocated dynamically for the shared memory record table. |
Use the sar -w command to report swapping and switching activity.
$ sar -w 00:00:00 swpin/s bswin/s swpot/s bswot/s pswch/s 01:00:00 0.00 0.0 0.00 0.0 22 |
The following list describes target values and observations related to the sar -w command output.
The number of LWP transfers into memory per second.
The number of blocks transferred for swap-ins per second. /* (float)PGTOBLK(xx->cvmi.pgswapin) / sec_diff */
The average number of processes that are swapped out of memory per second. If the number is greater than 1, you might need to increase memory.
The number of blocks that are transferred for swap-outs per second.
The number of kernel thread switches, per second.
All process swap-ins include process initialization.
The following example shows output from the sar -w command.
$ sar -w SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:04 swpin/s bswin/s swpot/s bswot/s pswch/s 01:00:00 0.00 0.0 0.00 0.0 132 02:00:01 0.00 0.0 0.00 0.0 133 03:00:00 0.00 0.0 0.00 0.0 133 04:00:00 0.00 0.0 0.00 0.0 134 05:00:00 0.00 0.0 0.00 0.0 133 06:00:00 0.00 0.0 0.00 0.0 133 07:00:00 0.00 0.0 0.00 0.0 132 08:00:00 0.00 0.0 0.00 0.0 131 08:20:00 0.00 0.0 0.00 0.0 133 08:40:01 0.00 0.0 0.00 0.0 132 09:00:00 0.00 0.0 0.00 0.0 132 09:20:00 0.00 0.0 0.00 0.0 132 09:40:00 0.00 0.0 0.00 0.0 335 10:00:00 0.00 0.0 0.00 0.0 601 10:20:00 0.00 0.0 0.00 0.0 353 10:40:00 0.00 0.0 0.00 0.0 747 11:00:00 0.00 0.0 0.00 0.0 804 Average 0.00 0.0 0.00 0.0 198 |
Use the sar -y command to monitor terminal device activities.
$ sar -y 00:00:00 rawch/s canch/s outch/s rcvin/s xmtin/s mdmin/s 01:00:00 0 0 0 0 0 0 |
If you have a lot of terminal I/O, you can use this report to determine if any bad lines exist. The activities recorded are defined in the following list.
Input characters (raw queue) per second
Input characters that are processed by canon (canonical queue) per second
Output characters (output queue) per second
Receiver hardware interrupts per second
Transmitter hardware interrupts per second
Modem interrupts per second
The number of modem interrupts per second (mdmin/s) should be close to zero. The receive and transmit interrupts per second (xmtin/s and rcvin/s) should be less than or equal to the number of incoming or outgoing characters, respectively. If not, check for bad lines.
The following example shows output from the sar -y command.
$ sar -y SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:04 rawch/s canch/s outch/s rcvin/s xmtin/s mdmin/s 01:00:00 0 0 0 0 0 0 02:00:01 0 0 0 0 0 0 03:00:00 0 0 0 0 0 0 04:00:00 0 0 0 0 0 0 05:00:00 0 0 0 0 0 0 06:00:00 0 0 0 0 0 0 07:00:00 0 0 0 0 0 0 08:00:00 0 0 0 0 0 0 08:20:00 0 0 0 0 0 0 08:40:01 0 0 0 0 0 0 09:00:00 0 0 0 0 0 0 09:20:00 0 0 0 0 0 0 09:40:00 0 0 1 0 0 0 10:00:00 0 0 37 0 0 0 10:20:00 0 0 0 0 0 0 10:40:00 0 0 3 0 0 0 11:00:00 0 0 3 0 0 0 Average 0 0 1 0 0 0 |