How to Check Terminal Activity (sar -y)
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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.
- rawch/s
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Input characters (raw queue) per second
- canch/s
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Input characters that are processed by canon (canonical queue) per second
- outch/s
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Output characters (output queue) per second
- rcvin/s
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Receiver hardware interrupts per second
- xmtin/s
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Transmitter hardware interrupts per second
- mdmin/s
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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.
Example 13–17 Checking Terminal Activity (sar -y)
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 |
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