19 Sep 2021 21:10:30 UTC
- Distribution: Devel-NYTProf
- Module version: 6.10
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Devel::NYTProf::Apache - Profile mod_perl applications with Devel::NYTProf
# in your Apache config file with mod_perl installed PerlPassEnv NYTPROF PerlModule Devel::NYTProf::Apache
If you're using virtual hosts with
PerlOptionsthat include either
+Clonethen see "VIRTUAL HOSTS" below.
Devel::NYTProf::Apacheis officially discouraged.
Apachemodule is not exercised anywhere in Devel-NYTProf's test suite. To do so would require an Apache/mod_perl environment, which in turn would require a major redirection of developer efforts. The code may be perfectly sound -- so we're not officially deprecating it -- but it was last modified in 2010.
You are an experienced user of Devel-NYTProf;
you can set up a development/testing environment with Apache/mod_perl;
can devise some tests that would demonstrate that Devel::NYTProf::Apache works as intended; and
would be willing to support it as an independent CPAN distribution, then please let us know!
This module allows mod_perl applications to be profiled using
If the NYTPROF environment variable isn't set at the time Devel::NYTProf::Apache is loaded then Devel::NYTProf::Apache will issue a warning and default it to:
The file actually created by NTProf will also have the process id appended to it because the
addpidoption is enabled by default.
See "ENVIRONMENT VARIABLES" in Devel::NYTProf for more details on the settings effected by this environment variable.
PerlPassEnvin your httpd.conf if you can set the NYTPROF environment variable externally. Note that if you set the NYTPROF environment variable externally then the file name obviously can't include the parent process id. For example, to set stmts=0 externally, use:
Each profiled mod_perl process will need to have terminated cleanly before you can successfully read the profile data file. The simplest approach is to start the httpd, make some requests (e.g., 100 of the same request), then stop it and process the profile data.
Alternatively you could send a TERM signal to the httpd worker process to terminate that one process. The parent httpd process will start up another one for you ready for more profiling.
It's usually a good idea to use just one child process when profiling, which you can do by setting the
MaxClientsto 1 in httpd.conf.
MaxRequestsPerChildto 0 to avoid worker processes exiting and restarting during the profiling, which would split the profile data across multiple files.
IfDefineblocks lets you leave the profile configuration in place and enable it whenever it's needed by adding
-D NYTPROFto the httpd startup command line.
<IfDefine NYTPROF> MaxClients 1 MaxRequestsPerChild 0 PerlModule Devel::NYTProf::Apache </IfDefine>
With that configuration you should get two profile files, one for the parent process and one for the worker.
If your httpd configuration includes virtual hosts with
PerlOptionsthat include either
+Clonethen mod_perl2 will create a new perl interpreter to handle requests for that virtual host. This causes some issues for profiling.
Devel::NYTProf::Apacheis loaded in the top-level configuration then activity in any virtual hosts that use their own perl interpreter won't be profiled. Normal virtual hosts will be profiled just fine.
You can profile a single virtual host that uses its own perl interpreter by loading
Devel::NYTProf::Apacheinside the configuration for that virtual host. In this case do not use
PerlModuledirective. You need to use a
Perldirective instead, like this:
<VirtualHost *:1234> ... <Perl> use Devel::NYTProf::Apache; </Perl> ... </VirtualHost>
Profiling mod_perl on Windows is not supported because NYTProf currently doesn't support threads.
Truncated profile: Profiles for large applications can take a while to write to the disk. Allow sufficient time after stopping apache, or check the process has actually exited, before trying to read the profile.
Truncated profile: The mod_perl child_terminate() function terminates the child without giving perl an opportunity to cleanup. Since
Devel::NYTProf::Apachedoesn't intercept the mod_perl child_terminate() function (yet) the profile will be corrupted if it's called. You're most likely to encounter this when using Apache::SizeLimit, so you may want to disable it while profiling.
<akaplan at nytimes.com>Tim Bunce, http://blog.timbunce.org Steve Peters,
<steve at fisharerojo.org>
Copyright (C) 2008 by Adam Kaplan and The New York Times Company. Copyright (C) 2008 by Steve Peters. Copyright (C) 2008-2012 by Tim Bunce.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.
Module Install Instructions
To install Devel::NYTProf, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell install Devel::NYTProf
For more information on module installation, please visit the detailed CPAN module installation guide.