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Diffstat (limited to 'cddl/contrib/dtracetoolkit/Examples/sh_cpudist_example.txt')
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diff --git a/cddl/contrib/dtracetoolkit/Examples/sh_cpudist_example.txt b/cddl/contrib/dtracetoolkit/Examples/sh_cpudist_example.txt new file mode 100644 index 0000000..272e909 --- /dev/null +++ b/cddl/contrib/dtracetoolkit/Examples/sh_cpudist_example.txt @@ -0,0 +1,92 @@ +The following are examples of sh_cpudist.d. + +This script traces the on-CPU time of Bourne shell functions and +prints a report containing distribution plots per function. Here it +traces the example program, Code/Shell/func_slow.sh. + + # sh_cpudist.d + Tracing... Hit Ctrl-C to end. + ^C + + On-CPU times (us), + + func_slow.sh, builtin, echo + value ------------- Distribution ------------- count + 8 | 0 + 16 |@@@@@@@@@@@@@ 1 + 32 |@@@@@@@@@@@@@@@@@@@@@@@@@@@ 2 + 64 | 0 + + func_slow.sh, builtin, [ + value ------------- Distribution ------------- count + 0 | 0 + 1 | 1 + 2 | 1 + 4 |@ 22 + 8 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 575 + 16 | 2 + 32 | 0 + 64 | 2 + 128 | 0 + + Exclusive function on-CPU times (us), + + func_slow.sh, func, func_a + value ------------- Distribution ------------- count + 65536 | 0 + 131072 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 262144 | 0 + + func_slow.sh, func, func_b + value ------------- Distribution ------------- count + 262144 | 0 + 524288 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 1048576 | 0 + + func_slow.sh, func, func_c + value ------------- Distribution ------------- count + 524288 | 0 + 1048576 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 2097152 | 0 + + Inclusive function on-CPU times (us), + + func_slow.sh, func, func_b + value ------------- Distribution ------------- count + 524288 | 0 + 1048576 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 2097152 | 0 + + func_slow.sh, func, func_c + value ------------- Distribution ------------- count + 524288 | 0 + 1048576 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 2097152 | 0 + + func_slow.sh, func, func_a + value ------------- Distribution ------------- count + 1048576 | 0 + 2097152 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 4194304 | 0 + +The on-CPU times should that the "[" builtin (test) usually took between +8 and 15 microseconds to execute, and was called over 500 times. + +The exclusive function on-CPU times show that func_a() spent between +131 ms and 262 ms on-CPU. + +The inclusive function on-CPU times show that both func_b() and func_c() +spent between 1.0 and 2.1 seconds on-CPU, and func_a() spent between 2.1 +and 4.2 seconds on-CPU. This inclusive time includes the time spent in other +functions called, and since func_a() called func_b() which called func_c(), +these times make sense. + +These on-CPU times are the time the thread spent running on a CPU, from when +the function began to when it completed. This does not include time +spent off-CPU time such as sleeping for I/O or waiting for scheduling. + +On-CPU times are useful for showing who is causing the CPUs to be busy. +See Notes/ALLoncpu_notes.txt for more details. Also see +Notes/ALLexclusive_notes.txt and Notes/ALLinclusive_notes.txt for a +detailed explanation of exclusive vs inclusive function time. + |
