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Analyzing Read/Write Operations with sar
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The UNIX sar (system activity reporter) command offers a very powerful way to analyze how the read/write operations are occurring from disk to buffer cache and from buffer cache to disk. By using the various options of the sar command, you can monitor disk and CPU activity, in addition to buffer cache activity. The output for the sar command has the following columns: bread/s: The number of read operations per second from disk to the buffer cache lread/s: The number of read operations per second from the buffer cache %rcache: The cache hit ratio for read requests bwrit/s: The number of write operations per second from disk to the buffer cache lwrit/s: The number of write operations per second to the buffer cache %wcache: The cache hit ratio for write requests
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Here s the output of a typical sar command which monitors your server s CPU activity, using the -u option (the 1 10 tells sar to refresh the output on the screen every second for a total of ten times): $ sar -u 1 10 HP-UX prod5 B.11.11 U 9000/800 16:11:21 16:11:22 16:11:23 16:11:24 16:11:25 16:11:26 16:11:27 16:11:28 16:11:29 16:11:30 16:11:31 Average $ In the preceding sar report, %usr shows the percentage of CPU time spent in the user mode, %sys shows the percentage of CPU time spent in the system mode, %wio shows the percentage of time the CPU is idle with some process waiting for I/O, and %idle shows the idle percentage of the CPU. You can see that the percentage of CPU due to processes waiting for I/O is quite high in this example. %usr 34 31 45 45 45 46 48 56 50 45 44 %sys 6 7 9 9 11 11 10 11 12 12 10 04/07/05 %wio 56 55 43 44 40 40 40 31 36 39 42 %idle 4 7 4 2 3 4 3 2 3 4 4
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The top command is another commonly used performance-monitoring tool. Unlike some of the other tools, the top command shows you a little bit of everything, such as the top CPU and memory utilization processes, the percentage of CPU time used by the top processes, and the memory utilization. The top command displays information in the following columns: CPU: Specifies the processor PID: Specifies the process ID USER: Specifies the owner of the process PRI: Specifies the priority value of the process NI: Specifies the nice value (nice invokes a command with an altered scheduling priority) . SIZE: Specifies the total size of the process in memory RES: Specifies the resident size of the process TIME: Specifies the CPU time used by the process %CPU: Specifies the CPU usage as a percentage of total CPU COMMAND: Specifies the command that started the process To invoke the top utility, you simply type the word top at the command prompt. To end the top display, just use the Ctrl+C key combination. Here s an example of typical output of the top command on a four-processor UNIX machine. The first part of the output (not shown here) shows the resource usage for each processor in the
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system. The second part of the output, shown in the following snippet, gives you information about the heaviest users of your system. $ top CPU PID USER PRI 21 2713 nsuser 134 23 28611 oracle 241 20 6951 oracle 241 13 9334 oracle 154 22 24517 oracle 68 22 13166 oracle 241 12 14097 oracle 241 $ NI 0 20 20 20 20 20 20 SIZE RES 118M 104M 40128K 9300K 25172K 19344K 40128K 9300K 36032K 5204K 40128K 9300K 40128K 9300K TIME 173:31 2:20 3:45 1:31 0:55 0:41 0:29 %CPU 49.90 46.60 44.62 37.62 36.48 35.19 33.75 COMMAND ns-httpd oraclepasprod rwrun60 oraclepasprod oraclepasprod oraclepasprod oraclepasprod
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