1The following are examples of php_cputime.d. 2 3This script traces the on-CPU time of PHP functions and prints a report. 4Here it traces the example program, Code/Php/func_abc.php. 5 6# php_cputime.d 7Tracing... Hit Ctrl-C to end. 8^C 9 10Count, 11 FILE TYPE NAME COUNT 12 func_abc.php func func_a 1 13 func_abc.php func func_b 1 14 func_abc.php func func_c 1 15 func_abc.php func sleep 3 16 - total - 6 17 18Exclusive function on-CPU times (us), 19 FILE TYPE NAME TOTAL 20 func_abc.php func func_c 17 21 func_abc.php func func_b 25 22 func_abc.php func func_a 74 23 func_abc.php func sleep 93 24 - total - 210 25 26Inclusive function on-CPU times (us), 27 FILE TYPE NAME TOTAL 28 func_abc.php func func_c 39 29 func_abc.php func func_b 87 30 func_abc.php func sleep 93 31 func_abc.php func func_a 210 32 33In total, six functions were called; sleep was called three times and there 34was one call each of func_a(), func_b() and func_c(). 35 36The exclusive subroutine on-CPU times show that func_a() spent around 74 37microseconds on-CPU, func_b() spent 25 microseconds on-CPU, and func_c() spent 3817 microseconds on-CPU. This exclusive times excludes time spent in other 39subroutines. 40 41The inclusive subroutine on-CPU times show that func_c() spent around 39 42microseconds on-CPU, func_b() spent around 87 microseconds on-CPU and 43func_a() spent around 210 microseconds. This inclusive time includes the time 44spent in other functions called (including sleep), and since func_a() called 45func_b() which called func_c(), these times make perfect sense. 46 47These on-CPU times are the time the program spent running on a CPU, from when 48the function began to when it completed. This does not include time 49spent off-CPU time such as sleeping for I/O or waiting for scheduling. 50 51On-CPU times are useful for showing who is causing the CPUs to be busy. 52See Notes/ALLoncpu_notes.txt for more details. Also see 53Notes/ALLexclusive_notes.txt and Notes/ALLinclusive_notes.txt for a 54detailed explanation of exclusive vs inclusive subroutine time. 55 56If you study the func_abc.php program alongside the above output, the numbers 57should make sense. 58 59