1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
The following are examples of php_cputime.d.
This script traces the on-CPU time of PHP functions and prints a report.
Here it traces the example program, Code/Php/func_abc.php.
# php_cputime.d
Tracing... Hit Ctrl-C to end.
^C
Count,
FILE TYPE NAME COUNT
func_abc.php func func_a 1
func_abc.php func func_b 1
func_abc.php func func_c 1
func_abc.php func sleep 3
- total - 6
Exclusive function on-CPU times (us),
FILE TYPE NAME TOTAL
func_abc.php func func_c 17
func_abc.php func func_b 25
func_abc.php func func_a 74
func_abc.php func sleep 93
- total - 210
Inclusive function on-CPU times (us),
FILE TYPE NAME TOTAL
func_abc.php func func_c 39
func_abc.php func func_b 87
func_abc.php func sleep 93
func_abc.php func func_a 210
In total, six functions were called; sleep was called three times and there
was one call each of func_a(), func_b() and func_c().
The exclusive subroutine on-CPU times show that func_a() spent around 74
microseconds on-CPU, func_b() spent 25 microseconds on-CPU, and func_c() spent
17 microseconds on-CPU. This exclusive times excludes time spent in other
subroutines.
The inclusive subroutine on-CPU times show that func_c() spent around 39
microseconds on-CPU, func_b() spent around 87 microseconds on-CPU and
func_a() spent around 210 microseconds. This inclusive time includes the time
spent in other functions called (including sleep), and since func_a() called
func_b() which called func_c(), these times make perfect sense.
These on-CPU times are the time the program 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 subroutine time.
If you study the func_abc.php program alongside the above output, the numbers
should make sense.
|
