Mike Ward wrote: > I'm rather new to mod_perl, so there's my disclaimer. > > When I learned perl CGI stuff, it was always done with CGI.pm. All the > example scripts, etc, in the book were done that way. Sending headers, > for example , was done like so: > > my $query = CGI->new(); > print $query->header(); > > rather than the style of: > > $r->send_http_header(); > > > Is this going to run more slowly, or is there much of a performance > differance, or what differance does it make, exactly? The server is > still running mod_perl, but will not take full advantage of the > increased speed if I'm not using it's apache api (I intend to learn > and start using it anyway, I'm just curious as to the question).
ok, there are really three levels to CGI scripts when it comes to mod_perl. level 1 is standard CGI via mod_cgi (what you have probably done to date) level 2 is mod_perl via Apache::Registry. Apache::Registry is a mod_cgi emulator that allows you to take advantage of mod_perl's speed while still using legacy CGI tools - essentially allowing you move CGI unaltered scripts between mod_cgi and mod_perl for performance gain (for some definition of unaltered :) level 3 is using Apache::Registry as a way to dispatch scripts written using the mod_perl API, at which point you cannot move them back over to mod_cgi. outside of CGI scripting are mod_perl handlers (a fourth level), which use the mod_perl API at various points in the apache request lifecycle (including content generation). now, between level 2 and level 3 I'm not exactly sure what the performance gains would look like (and I don't think it's covered in http://www.chamas.com/bench/) , but it probably isn't significant enough to worry about as part of an initial migration step. I suspect that the real gains to be had in using the API are that you can drop things like the param parsing of CGI.pm in favor of tools like Apache::Request, but getting the initial boost from Apache::Registry might be all that you need, depending on the size of your application. HTH --Geoff -- Report problems: http://perl.apache.org/bugs/ Mail list info: http://perl.apache.org/maillist/modperl.html List etiquette: http://perl.apache.org/maillist/email-etiquette.html
