c29d517558
unmodified. For others we'll need to add the missing probes and adjust. This is not attached to the build.
85 lines
3.9 KiB
Plaintext
85 lines
3.9 KiB
Plaintext
The following are examples of php_calldist.d.
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This script traces the elapsed time of PHP functions and prints a report
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containing distribution plots per subroutine. Here it traces the example program
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Code/Php/func_abc.php.
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# php_calldist.d
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Tracing... Hit Ctrl-C to end.
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^C
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Exclusive function elapsed times (us),
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func_abc.php, func, func_a
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value ------------- Distribution ------------- count
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128 | 0
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256 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1
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512 | 0
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func_abc.php, func, func_b
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value ------------- Distribution ------------- count
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128 | 0
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256 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1
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512 | 0
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func_abc.php, func, func_c
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value ------------- Distribution ------------- count
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128 | 0
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256 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1
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512 | 0
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func_abc.php, func, sleep
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value ------------- Distribution ------------- count
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262144 | 0
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524288 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 3
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1048576 | 0
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Inclusive function elapsed times (us),
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func_abc.php, func, func_c
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value ------------- Distribution ------------- count
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262144 | 0
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524288 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1
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1048576 | 0
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func_abc.php, func, func_b
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value ------------- Distribution ------------- count
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524288 | 0
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1048576 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1
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2097152 | 0
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func_abc.php, func, sleep
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value ------------- Distribution ------------- count
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262144 | 0
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524288 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 3
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1048576 | 0
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func_abc.php, func, func_a
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value ------------- Distribution ------------- count
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1048576 | 0
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2097152 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1
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4194304 | 0
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In total, 3 subroutines were called, one each of func_a(), func_b() and
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func_c(), and sleep was called 3 times. You can see this reflected in the
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"count" column on the right.
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The exclusive subroutine elapsed times show that each subroutine spent
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between 256 and 512 microseconds. This time excludes the time spent in
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other subroutines.
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The inclusive subroutine elapsed times show that func_c() took between 0.5
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seconds and 1 second, func_b() took between 1 second and 2.1 seconds, and
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func_a() took between 2.1 seconds and 4.2 seconds to execute. This time
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includes the time spent in other subroutines called, and since func_a() called
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func_b() which called func_c(), these times make sense.
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These elapsed times are the absolute time from when the subroutine began to
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when it completed - which includes off-CPU time due to other system events
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such as I/O, scheduling, interrupts, etc.
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Elapsed times are useful for identifying where latencies are.
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See Notes/ALLelapsed_notes.txt for more details. Also see
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Notes/ALLexclusive_notes.txt and Notes/ALLinclusive_notes.txt for a
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detailed explanation of exclusive vs inclusive subroutine time.
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