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state is reported for all statistics. Thus, when you run it at regular intervals (such as each minute), you can obtain high-resolution samples for establishing system performance within a specific epoch by using iostat. This can be very useful for gaining an accurate picture of how system resources are allocated. To display disk usage statistics, the following command produces ten reports over epochs of 60 seconds:
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# iostat -x 60 device r/s w/s sd0 0.2 0.4 ... device r/s w/s sd0 0.3 0.3 ... 10 kr/s kw/s wait actv svc_ t %w %b 12.2 9.0 1.0 2.0 38.6 0 1 kr/s kw/s wait actv svc_t %w %b 12.5 8.0 2.0 1.0 33.2 0 1
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The following describes what each column indicates for the disk device:
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device r/s w/s kr/s kw/s wait actv svc_t %w %b
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Shows the device name (sd1 indicates a disk) Displays the number of disk reads per second Prints the number of disk writes per second Shows the total amount of data read per second (in kilobytes) Displays the total amount of data written per second (in kilobytes) Prints the mean number of waiting transactions Shows the mean number of transactions being processed Displays the mean period for service in milliseconds Prints the percentage of time spent waiting Shows the percentage of time that the disk is working
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To display statistics for the CPU at one-second intervals 20 times, you could use the following command:
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# iostat c 1 20
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The output would display four columns, showing user time, system time, I/O wait, and idle time, respectively, in percentage terms.
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One of the greatest performance issues in system tuning is virtual memory capacity and performance. Obviously, if your server is using large amounts of swap, running off a slow disk, the time required to perform various operations will increase. One application that reports on the current state of virtual memory is the vmstat command, which displays a large collection of statistics concerning virtual memory performance. As you can see from the following display, the virtual memory report on the server is not
Part IV:
Managing Devices
encouraging: 1,346,736,431 total address translation faults were recorded, as well as 38,736,546 major faults, 1,346,736,431 minor faults, and 332,163,181 copy-on-write faults. This suggests that more virtual memory is required to support operations or that, at least, the disk on which the swap partition is placed should be upgraded to 10,000 RPM.
# vmstat -s 253 swap ins 237 swap outs 253 pages swapped in 705684 pages swapped out 1346736431 total address trans. faults taken 56389345 page ins 23909231 page outs 152308597 pages paged in 83982504 pages paged out 26682276 total reclaims 26199677 reclaims from free list 0 micro (hat) faults 1346736431 minor (as) faults 38736546 major faults 332163181 copy-on-write faults 316702360 zero fill page faults 99616426 pages examined by the clock daemon 782 revolutions of the clock hand 126834545 pages freed by the clock daemon 14771875 forks 3824010 vforks 29303326 execs 160142153 cpu context switches 2072002374 device interrupts 3735561061 traps 2081699655 system calls 1167634213 total name lookups (cache hits 70%) 46612294 toolong 964665958 user cpu 399229996 system cpu 1343911025 idle cpu 227505892 wait cpu
mpstat
Another factor influencing performance is the system load obviously, a system that runs a large number of processes and consistently has a load of greater than 1.0 cannot be relied upon to give adequate performance in times of need. You can use the mpstat
20:
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command to examine a number of system parameters, including the system load, over a number of regular intervals. Many administrators take several hundred samples using mpstat and compute an average system load for specific times of the day when a peak load is expected (e.g., at 9 A.M.). This can greatly assist in capacity planning of CPUs to support expanding operations. Fortunately, SPARC hardware architectures support large numbers of CPUs, so it s not difficult to scale up to meet demand. The output from mpstat contains several columns, which measure the following parameters: Context switches Cross-calls between CPUs Idle percentage of CPU time Interrupts Minor and major faults Sys percentage of CPU time Thread migrations User percentage of CPU time For the server output shown next, the proportion of system time consumed is well below 100 percent the peak value is 57 percent for only one of the CPUs in this dualprocessor system. Sustained values of sys at or near the 100-percent level indicate that you should add more CPUs to the system:
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