Re: Limiting resources used by scripts on web server

On Jun 30, 8:59 am, "graeme.piete...@xxxxxxxxx"
<graeme.piete...@xxxxxxxxx> wrote:

I had forgotten that TCLHttpd supports CGI, but it does rather negate
the advantages of using a server with TCL support.

If I understand the documentation, there are limits on time but on
memory. If I am wrong about it would solve the problem very nicely.

Well, you're asking too much I'm afraid. As soon as you insist on
servicing all requests from a single process (which is what you're
doing by rejecting CGI), pre-request memory accounting becomes
extremely hard.
More precisely, accounting by the OS becomes impossible (since the
heap is shared among all threads of a process), so must be done at the
application level. And when the application is Tcl, it turns out it is
hard because (1) Tcl_Objs are allocated globally, and not bound to a
thread/interp, (2) to my knowledge there is no instrumentation to keep
track of how many Tcl_Objs were created by a given thread/interp.

Advice: if you're worried by memory consumption of a single request,
my bet is that the granularity will be large enough for CGI to be an
acceptable vehicle. And it will give you 'ulimit' for free.

-Alex

.

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