Re: Getting NYTProf to work with vhosts that use PerlOptions +Parent

On Wed, Apr 28, 2010 at 11:25:14PM -0400, Adam Prime wrote:
> Maybe you could try doing the push_handler for the ChildExitHandler
> when the ChildInitHandler executes?  Just a shot in the dark.

Umm, but how to I get the ChildInitHandler handle to use the right perl
interpreter?

Tim.

> Adam
> 
> Tim Bunce wrote:
> >This is proving to be tricky.
> >
> >If I load Devel::NYTProf::Apache[1] in the main part of httpd.conf then
> >I get a profile that includes all the activity *except* for any activity
> >in vhosts that use +Parent.
> >
> >If I load it inside the VirtualHost section then I get a profile of
> >activity within that vhost. Great. Except there's a problem...
> >
> >For a profile to be useful it must be terminated properly. Devel::NYTProf
> >does that using an END block. Devel::NYTProf::Apache does that using
> >
> >    sub child_exit { DB::_finish() }
> >
> >    my $s = Apache2::ServerUtil->server;
> >    $s->push_handlers(PerlChildExitHandler => \&child_exit);
> >
> >That works fine normally, but doesn't work with PerlOptions +Parent.
> >I get an error:
> >    [error] lookup of 'Devel::NYTProf::Apache::child_exit' failed
> >
> >I presume that's because the $s doesn't refer to the vhost "I'm in".
> >I can use $s->next (after require Apache2::ServerRec) to iterate over
> >the vhosts but I can't see a way to find "my" vhost.
> >
> >Is there one?
> >
> >What I'm looking for is some way for *a specific vhost perl interpreter*
> >to run code at PerlChildExitHandler *in that interpreter*.
> >
> >Any ideas?
> >
> >Tim.
> >
> >p.s. Simply adding END { DB::_finish() } to Devel::NYTProf::Apache gives
> >me a profile that ends during server initialization because the vhost
> >perl interpreter is initialized using perl_run() and PL_exit_flags |=
> >PERL_EXIT_DESTRUCT_END has not been set.  So I've now set PL_exit_flags
> >via NYTProf and that's giving me a usable profile for my limited case.
> >I've not yet looked-into how to generalise that into code that's work in
> >normal (non +Parent) case.
> >
> >[1] http://cpansearch.perl.org/src/TIMB/Devel-NYTProf-3.11/lib/Devel/NYTProf/Apache.pm
> 
>