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63 lines
2.0 KiB
Plaintext
63 lines
2.0 KiB
Plaintext
The following is an example of the sampleproc program.
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Here we run sampleproc for a few seconds on a workstation,
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# ./sampleproc
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Sampling at 100 hertz... Hit Ctrl-C to end.
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^C
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PID CMD COUNT
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1659 mozilla-bin 3
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109 nscd 4
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2197 prstat 23
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2190 setiathome 421
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PID CMD PERCENT
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1659 mozilla-bin 0
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109 nscd 0
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2197 prstat 5
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2190 setiathome 93
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The first table shows a count of how many times each process was sampled
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on the CPU. The second table gives this as a percentage.
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setiathome was on the CPU 421 times, which is 93% of the samples.
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The following is sampleproc running on a server with 4 CPUs. A bash shell
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is running in an infinate loop,
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# ./sampleproc
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Sampling at 100 hertz... Hit Ctrl-C to end.
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^C
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PID CMD COUNT
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10140 dtrace 1
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28286 java 1
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29345 esd 2
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29731 esd 3
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2 pageout 4
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29733 esd 6
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10098 bash 1015
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0 sched 3028
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PID CMD PERCENT
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10140 dtrace 0
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28286 java 0
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29345 esd 0
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29731 esd 0
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2 pageout 0
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29733 esd 0
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10098 bash 24
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0 sched 74
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The bash shell was on the CPUs for 24% of the time, which is consistant
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with a CPU bound single threaded application on a 4 CPU server.
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The above sample was around 10 seconds long. During this time, there were
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around 4000 samples (checking the COUNT column), this is due to
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4000 = CPUs (4) * Hertz (100) * Seconds (10).
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