1Devel::NYTProf::Apache(U3s)er Contributed Perl DocumentatDieovnel::NYTProf::Apache(3)
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6 Devel::NYTProf::Apache - Profile mod_perl applications with
7 Devel::NYTProf
8
10 # in your Apache config file with mod_perl installed
11 PerlPassEnv NYTPROF
12 PerlModule Devel::NYTProf::Apache
13 If you're using virtual hosts with "PerlOptions" that include either
15 "+Parent" or "+Clone" then see "VIRTUAL HOSTS" below.
16
18 Use of "Devel::NYTProf::Apache" is officially discouraged.
19 The "Apache" module is not exercised anywhere in Devel-NYTProf's test
21 suite. To do so would require an Apache/mod_perl environment, which in
22 turn would require a major redirection of developer efforts. The code
23 may be perfectly sound -- so we're not officially deprecating it -- but
24 it was last modified in 2010.
25 If ...
27 1. You are an experienced user of Devel-NYTProf;
29 2. you can set up a development/testing environment with
31 Apache/mod_perl;
32 3. can devise some tests that would demonstrate that
34 Devel::NYTProf::Apache works as intended; and
35 4. would be willing to support it as an independent CPAN distribution,
37 then please let us know!
38
40 This module allows mod_perl applications to be profiled using
41 "Devel::NYTProf".
42 If the NYTPROF environment variable isn't set at the time
44 Devel::NYTProf::Apache is loaded then Devel::NYTProf::Apache will issue
45 a warning and default it to:
46 file=/tmp/nytprof.$$.out:addpid=1:endatexit=1
48 The file actually created by NTProf will also have the process id
50 appended to it because the "addpid" option is enabled by default.
51 See "ENVIRONMENT VARIABLES" in Devel::NYTProf for more details on the
53 settings effected by this environment variable.
54 Try using "PerlPassEnv" in your httpd.conf if you can set the NYTPROF
56 environment variable externally. Note that if you set the NYTPROF
57 environment variable externally then the file name obviously can't
58 include the parent process id. For example, to set stmts=0 externally,
59 use:
60 NYTPROF=file=/tmp/nytprof.out:out:addpid=1:endatexit=1:stmts=0
62 Each profiled mod_perl process will need to have terminated cleanly
64 before you can successfully read the profile data file. The simplest
65 approach is to start the httpd, make some requests (e.g., 100 of the
66 same request), then stop it and process the profile data.
67 Alternatively you could send a TERM signal to the httpd worker process
69 to terminate that one process. The parent httpd process will start up
70 another one for you ready for more profiling.
71 Example httpd.conf
73 It's usually a good idea to use just one child process when profiling,
74 which you can do by setting the "MaxClients" to 1 in httpd.conf.
75 Set "MaxRequestsPerChild" to 0 to avoid worker processes exiting and
77 restarting during the profiling, which would split the profile data
78 across multiple files.
79 Using an "IfDefine" blocks lets you leave the profile configuration in
81 place and enable it whenever it's needed by adding "-D NYTPROF" to the
82 httpd startup command line.
83 <IfDefine NYTPROF>
85 MaxClients 1
86 MaxRequestsPerChild 0
87 PerlModule Devel::NYTProf::Apache
88 </IfDefine>
89 With that configuration you should get two profile files, one for the
91 parent process and one for the worker.
92
94 If your httpd configuration includes virtual hosts with "PerlOptions"
95 that include either "+Parent" or "+Clone" then mod_perl2 will create a
96 new perl interpreter to handle requests for that virtual host. This
97 causes some issues for profiling.
98 If "Devel::NYTProf::Apache" is loaded in the top-level configuration
100 then activity in any virtual hosts that use their own perl interpreter
101 won't be profiled. Normal virtual hosts will be profiled just fine.
102 You can profile a single virtual host that uses its own perl
104 interpreter by loading "Devel::NYTProf::Apache" inside the
105 configuration for that virtual host. In this case do not use
106 "PerlModule" directive. You need to use a "Perl" directive instead,
107 like this:
108 <VirtualHost *:1234>
110 ...
111 <Perl> use Devel::NYTProf::Apache; </Perl>
112 ...
113 </VirtualHost>
114
116 Profiling mod_perl on Windows is not supported because NYTProf
117 currently doesn't support threads.
118
120 Truncated profile: Profiles for large applications can take a while to
121 write to the disk. Allow sufficient time after stopping apache, or
122 check the process has actually exited, before trying to read the
123 profile.
124 Truncated profile: The mod_perl child_terminate() function terminates
126 the child without giving perl an opportunity to cleanup. Since
127 "Devel::NYTProf::Apache" doesn't intercept the mod_perl
128 child_terminate() function (yet) the profile will be corrupted if it's
129 called. You're most likely to encounter this when using
130 Apache::SizeLimit, so you may want to disable it while profiling.
131
133 Devel::NYTProf
134
136 Adam Kaplan, "<akaplan at nytimes.com>" Tim Bunce,
137 <http://blog.timbunce.org> Steve Peters, "<steve at fisharerojo.org>"
138
140 Copyright (C) 2008 by Adam Kaplan and The New York Times Company.
141 Copyright (C) 2008 by Steve Peters.
142 Copyright (C) 2008-2012 by Tim Bunce.
143 This library is free software; you can redistribute it and/or modify it
145 under the same terms as Perl itself, either Perl version 5.8.8 or, at
146 your option, any later version of Perl 5 you may have available.
147perl v5.34.0 2022-01-21 Devel::NYTProf::Apache(3)