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Diffstat (limited to 'cddl/contrib/dtracetoolkit/Examples/php_cpudist_example.txt')
| -rw-r--r-- | cddl/contrib/dtracetoolkit/Examples/php_cpudist_example.txt | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/cddl/contrib/dtracetoolkit/Examples/php_cpudist_example.txt b/cddl/contrib/dtracetoolkit/Examples/php_cpudist_example.txt new file mode 100644 index 0000000..6da7d29 --- /dev/null +++ b/cddl/contrib/dtracetoolkit/Examples/php_cpudist_example.txt @@ -0,0 +1,84 @@ +The following are examples of php_cpudist.d. + +This script traces the on-CPU time of PHP functions and prints a report +containing distribution plots per subroutine. Here it traces the example +program Code/Php/func_abc.php. + +# php_cpudist.d +Tracing... Hit Ctrl-C to end. +^C + +Exclusive function on-CPU times (us), + func_abc.php, func, func_a + value ------------- Distribution ------------- count + 8 | 0 + 16 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 32 | 0 + + func_abc.php, func, func_b + value ------------- Distribution ------------- count + 8 | 0 + 16 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 32 | 0 + + func_abc.php, func, func_c + value ------------- Distribution ------------- count + 8 | 0 + 16 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 32 | 0 + + func_abc.php, func, sleep + value ------------- Distribution ------------- count + 8 | 0 + 16 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 3 + 32 | 0 + + +Inclusive function on-CPU times (us), + func_abc.php, func, func_c + value ------------- Distribution ------------- count + 16 | 0 + 32 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 64 | 0 + + func_abc.php, func, sleep + value ------------- Distribution ------------- count + 8 | 0 + 16 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 3 + 32 | 0 + + func_abc.php, func, func_b + value ------------- Distribution ------------- count + 32 | 0 + 64 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 128 | 0 + + func_abc.php, func, func_a + value ------------- Distribution ------------- count + 64 | 0 + 128 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1 + 256 | 0 + +In total, 3 subroutines were called, one each of func_a(), func_b() and +func_c(), and sleep was called 3 times. You can see this reflected in the +"count" column on the right. + +The exclusive subroutine elapsed times show that each subroutine spent +between 16 and 31 microseconds on CPU. This time excludes the time spent in +other subroutines. + +The inclusive subroutine elapsed times show that func_c() took between 32 +microseconds and 63 microseconds on CPU; sleep ran three times and each time +took between 16 and 31 microseconds on CPU; func_b() took between 64 and 127 +microseconds on CPU; and func_a() took between 128 and 255 microseconds on +CPU. This time includes the time spent in other subroutines called, and since +func_a() called func_b() which called func_c(), these times make sense. + +These elapsed times are the on CPU time from when the subroutine began to +when it completed. + +On-CPU times are useful for showing who is causing the CPUs to be busy. +See Notes/ALLelapsed_notes.txt for more details. Also see +Notes/ALLexclusive_notes.txt and Notes/ALLinclusive_notes.txt for a +detailed explanation of exclusive vs inclusive subroutine time. + |
