At 06:36 PM 8/8/2001 +0200, you wrote:
>"David N. Welton" wrote:
...
>I wanted to check and see how opinions run regarding this? Concerns?
>>Things you'd like to see?
>My only wish (and concern, too) is that mod_dtcl won't trade off speed for
>new features. Remember that most potential mod_dtcl users are people with
>a large base of Tcl scripts and applications that run as CGI and, as a first
>approach, they will try a 'quick port' with a minimal rewrite of their code.
Hey, it sounds like you're talking about me!
I did a 'quick port' of numerous Tcl CGIs over to mod_dtcl. My main
objective was to conserve system resources by sharing interpreters, as some
of the CGIs were pretty hefty search engines.
I have since attempted to optimize the code a little bit. One of the major
things I did was to load the database from a file and store it in an array
in my own namespace. eg: ::myspace. With this method, I only have to
load the large database once from file. For subsequent queries, I can
access it directly from the array if it exists.
This is all fine and good, except that each httpd child appears to running
its own interpreter. So each child has to load a copy of each of the
databases. This in and of itself isn't that big of a deal. Yes, it uses
resources unnecessarily a little, but I can live with it.
What bothers me is when someone clicks on 'stop' or 'back' in the middle of
a database search. If they then start a new search, it often ends up on a
different httpd child. Because of this, one abusive user could very easily
tie up many system resources. I'd like to be able to use a
one-search-at-a-time method, disallowing additional searches from that user
until the results from that user's first search were returned. But to do
this, each httpd child must know what every other child is doing.
Admittedly, this could be done by maintaining a current-activity log
file. But I'd prefer to keep the file read-writes down to a minimum. It
would be easier if I could keep track of current activity in an array in
memory that every child could access.
Is it possible to access the environment of the other httpd children? If
so, it has eluded me so far, and I haven't seen a solution in the
documentation, either.
As a side discussion, I would appreciate hearing others' opinions on the
benefits of using compiled Tcl (outside of mod_dtcl) to speed up a search
engine and lower system overhead. I was considering both, and I ended up
going with mod_dtcl. A typical search query takes 5-15 seconds on the very
low-end machine. To be honest, I haven't seen too much of a speed increase
on searches by using mod_dtcl. I *think* the system load is a little bit
better, though.
Thanks.
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