1Devel::NYTProf::Apache(U3s)er Contributed Perl DocumentatDieovnel::NYTProf::Apache(3)
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NAME

6       Devel::NYTProf::Apache - Profile mod_perl applications with
7       Devel::NYTProf
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SYNOPSIS

10         # in your Apache config file with mod_perl installed
11         PerlPassEnv NYTPROF
12         PerlModule Devel::NYTProf::Apache
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14       If you're using virtual hosts with "PerlOptions" that include either
15       "+Parent" or "+Clone" then see "VIRTUAL HOSTS" below.
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DESCRIPTION

18       This module allows mod_perl applications to be profiled using
19       "Devel::NYTProf".
20
21       If the NYTPROF environment variable isn't set at the time
22       Devel::NYTProf::Apache is loaded then Devel::NYTProf::Apache will issue
23       a warning and default it to:
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25         file=/tmp/nytprof.$$.out:addpid=1:endatexit=1
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27       The file actually created by NTProf will also have the process id
28       appended to it because the "addpid" option is enabled by default.
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30       See "ENVIRONMENT VARIABLES" in Devel::NYTProf for more details on the
31       settings effected by this environment variable.
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33       Try using "PerlPassEnv" in your httpd.conf if you can set the NYTPROF
34       environment variable externally.  Note that if you set the NYTPROF
35       environment variable externally then the file name obviously can't
36       include the parent process id. For example, to set stmts=0 externally,
37       use:
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39           NYTPROF=file=/tmp/nytprof.out:out:addpid=1:endatexit=1:stmts=0
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41       Each profiled mod_perl process will need to have terminated cleanly
42       before you can successfully read the profile data file. The simplest
43       approach is to start the httpd, make some requests (e.g., 100 of the
44       same request), then stop it and process the profile data.
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46       Alternatively you could send a TERM signal to the httpd worker process
47       to terminate that one process. The parent httpd process will start up
48       another one for you ready for more profiling.
49
50   Example httpd.conf
51       It's usually a good idea to use just one child process when profiling,
52       which you can do by setting the "MaxClients" to 1 in httpd.conf.
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54       Set "MaxRequestsPerChild" to 0 to avoid worker processes exiting and
55       restarting during the profiling, which would split the profile data
56       across multiple files.
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58       Using an "IfDefine" blocks lets you leave the profile configuration in
59       place and enable it whenever it's needed by adding "-D NYTPROF" to the
60       httpd startup command line.
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62         <IfDefine NYTPROF>
63             MaxClients 1
64             MaxRequestsPerChild 0
65             PerlModule Devel::NYTProf::Apache
66         </IfDefine>
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68       With that configuration you should get two profile files, one for the
69       parent process and one for the worker.
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VIRTUAL HOSTS

72       If your httpd configuration includes virtual hosts with "PerlOptions"
73       that include either "+Parent" or "+Clone" then mod_perl2 will create a
74       new perl interpreter to handle requests for that virtual host.  This
75       causes some issues for profiling.
76
77       If "Devel::NYTProf::Apache" is loaded in the top-level configuration
78       then activity in any virtual hosts that use their own perl interpreter
79       won't be profiled. Normal virtual hosts will be profiled just fine.
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81       You can profile a single virtual host that uses its own perl
82       interpreter by loading "Devel::NYTProf::Apache" inside the
83       configuration for that virtual host. In this case do not use
84       "PerlModule" directive. You need to use a "Perl" directive instead,
85       like this:
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87           <VirtualHost *:1234>
88               ...
89               <Perl> use Devel::NYTProf::Apache; </Perl>
90               ...
91           </VirtualHost>
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LIMITATIONS

94       Profiling mod_perl on Windows is not supported because NYTProf
95       currently doesn't support threads.
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TROUBLESHOOTING

98       Truncated profile: Profiles for large applications can take a while to
99       write to the disk. Allow sufficient time after stopping apache, or
100       check the process has actually exited, before trying to read the
101       profile.
102
103       Truncated profile: The mod_perl child_terminate() function terminates
104       the child without giving perl an opportunity to cleanup. Since
105       "Devel::NYTProf::Apache" doesn't intercept the mod_perl
106       child_terminate() function (yet) the profile will be corrupted if it's
107       called. You're most likely to encounter this when using
108       Apache::SizeLimit, so you may want to disable it while profiling.
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SEE ALSO

111       Devel::NYTProf
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AUTHOR

114       Adam Kaplan, "<akaplan at nytimes.com>" Tim Bunce,
115       <http://www.tim.bunce.name> and <http://blog.timbunce.org> Steve
116       Peters, "<steve at fisharerojo.org>"
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119         Copyright (C) 2008 by Adam Kaplan and The New York Times Company.
120         Copyright (C) 2008 by Steve Peters.
121         Copyright (C) 2008-2012 by Tim Bunce.
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123       This library is free software; you can redistribute it and/or modify it
124       under the same terms as Perl itself, either Perl version 5.8.8 or, at
125       your option, any later version of Perl 5 you may have available.
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129perl v5.28.0                      2015-05-10         Devel::NYTProf::Apache(3)
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