Without knowing the specifics of what you're doing, its hard for anyone to really make a judgment on that.

If your SBCL code will be pulling in data from various and sundry sources, and the quality of that data is at all under question (i.e. syntax or formatting errors, prone to human error or malicious intent, etc) or if the information from the users is at all sensitive (financial?) I'd say its best to separate things into individual SBCL instances.

If this isn't true, it may indeed be beneficial to thread in an individual SBCL instance.

But again, it all depends on what you're doing. You haven't done it before, so necessarily there will be some exploration and research needed on your part.  My suggestion is to just get coding. Find some examples - simple or otherwise and just dig in.  It's easy in Lisp to throw together the main concepts of your application and make a mess. Somewhere in that process the 'right way' will come to you. Then throw everything out and do it the right way.


2010/7/29 Slobodan Milnović <slobodan.milnovic@gmail.com>
Hi.

I've been planning one project for a while now, but I'm still
undecided which direction to take.

The project will be web based, using weblocks, under x86-64 linux
(Debian, if that makes any difference). There will be three main
logical parts. One part will be the listener/sender that will be
collecting data and storing it in the postgresql and sending commands
to the data sources, one for the web administration of the project and
data sources, and one for the data processing with the web pages for
the users that will display the collected and processed data.

Since I'm not quite experienced in using common lisp and sbcl
implementation (especially not using threads), and this will be my
first project using weblocks, I haven't decided if it would be better
to run it all in one sbcl instance as several threads, or to run each
part in its own sbcl instance. I guess it would be best to run it all
in one instance. On the other hand, in the case of problems, if one
part breaks for some reason, other parts would still work in separate
sbcl instances? I'd like to hear an experienced opinions and advices.
How would you do it? I don't need source, but pointers and
documentation would be great.

Also, if someone has some nice links and documents that demonstrate
and explain how to make an daemon written in the common lisp (with
gotchas and stuff), especially for the sbcl of course, it would be
very much appreciated. I know that there are already several projects
written in CL that work as daemons (so I can read source, which I do),
but I hope that there are some "simple" examples for the beginners to
try also.

Thanks in advance.

--
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