Richard Gaskin wrote:
It's the same, for Perl as CGI and Python as CGI. But both mod_perl and mod_python exist, and are (reputedly, haven't seen any figures or benchmark numbers) much faster than starting a new interpreter each time.Dan Shafer wrote:
On another thread, jbv (JB) wrote about using Rev as a CGI engine on Linux as a matter of regular course.
I'm curious. I've been laying out a design for an INternet-based app and figuring I'd have to use Python (which is OK because I love it but in some ways it may be overkill for this project) because of my understanding that a Rev CGI can't handle even modest volumes of traffic. This is apparently because a separate instance of the CGI is launched for each HTTP request received.
True or myth?
It's true on all non-Mac servers (Macs can use Apple events), but how is this different from Perl or Python?
I know that in recent years there's an option in Apache to keep Perl resident in memory, but behaviorally it still acts as a separate instance.
If there isn't commonly the same sort of option for Python, then my hunch is that the resource demand would be measured by a combination of engine size (load time) and engine efficiency, and may not differ dramatically from the Rev engine. Jacque recalls Scott Raney once noting that when called as a CGI, the "faceless" engine does a lot less work at startup and loads almost instantaneously, even faster than a scriptless standalone.
Do I misunderstand something about CGI and/or Python?
Anyone have any hard comparison data about relative efficiencies between Rev and Python?
Yeah - they're both faster than the other for some things. Tell me which area you're interested in and I'll concoct a benchmark to prove that one is faster than the other; you tell me which one you want to win, and I'll make it win :-)
There is always the other option, of running a Rev (or Python, or Perl, ...) server, and serving requests directly from that. This can give significantly better response times and significantly higher transaction rates - but it means the server needs to satisfy all requests - even those that could have been left to basic html. And it means that you have a single instance - so in some cases the programming gets orders of magnitude harder, while in others it might get easier.
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