Brown trousers time :~

Jonathan Stowe jns at
Mon Oct 8 10:50:24 BST 2007

On Mon, 2007-10-08 at 01:47 +0100, Lyle - wrote:

> I'm concerned that I'll have to quickly write some C libraries for the 
> heavy traffic parts

For the most part, unless you need to do heavy mathematics or need to
use a pre-existing C library then writing XS code is probably not the
way to go - for simple operations the overhead of calling into the XS is
going to offset the run time.  The best thing to do is to write your
code in Perl and then profile it - if profiling indicates that you have
certain parts of the code that are taking up significant parts of the
run time then you may have a candidate for optimisation - but you really
don't want to even bother to think about micro-optimizations before you
have completed the code.

> What's the mod_perl equivalent in Win32? I'm guessing PerlScript in ASP, 
> but is that faster? I can't find any benchmarks.

Well of course Apache runs fine on windows, so the answer is, er,
mod_perl.  If you are stuck with IIS then probably the very closest
thing is to use ISAPI Perl which is part of the Activeperl installation
- this creates an in-process and persistent perl interpreter and you
have all the same caveats as with Apache::Registry programs.  Classic
ASP is a completely different model and using PerlScript there is just
really sugar coating over the whole nastiness - you would need to
completely rewrite nearly everything to use it. Also ASP has been dead
for a few years now - being replaced by ASP.NET which is a much nicer
model but less easy to use Perl with at all (but not impossible.)

> Would it be best to have separate databases (all in MySQL) for different 
> parts of the program? So that the database tables that are heavily 
> accessed are totally separate from those that aren't.

It won't make any difference whatsoever - the same engine has to deal
with the requests anyway. Separate databases just makes your design less
rational and will add overhead at the language layer. Splitting the most
used tables across separate disc spindles will certainly help, but MySQL
never used to have a facility to do that (I'm sure it will be available
in the very next version to the one available.)

Make war on hippies

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