In our previous episode, Andrew Brunner said: > > Well... I think CGI gateway is a good way. If the real app (FCGI) have > > troubles, I can change the URL that the CGI (gateway) uses to call the > > real app and to point to another app (in other server, e.g.). What do > > you think about it? > > I think it would be worth discussing what can be done or at least > start thinking about getting the memory manager not to blow-out any > more. I really don't want to re-start server software just because a > few apps (embedded in the service application) crash.
Well, first, there is the question if there is something to be fixed. (I myself think that plugging a few holes here and there once a quarter is might be worth avoiding the GC overhead and complexity. To be honest I never understood what all the fuzz about GC is about). But anyway, the question has been asked before, and I then archived the responses here: http://wiki.freepascal.org/garbage_collection For the specific case of web applications, there are other possibilities, since in general, one could try to exploit the knowledge that anything allocated during a request can be deallocated. Like the old mark/heap Of course somehow we would have to manage two heapmgrs then (for sessions and requests one each), and avoid polution the session heapmgr with request blocks. (e.g. by modifying ansistring etc helpers to avoid copy-on-write semantics) One could even regularly stream the session(s) over IPC to another addressspace (or flush to DB) once in a while and reset the session space too. > Has anyone with experience with developing the memory manager been > following? Not likely, since I haven't seen any insights in this thread. > What about a separate discussion on application > stabilization after an unhanded exception? No system is safe for that. Even a managed .NET or Java app can NIL some variable in some unlikely codepath, and every subsequent request can raise a NIL exception, resulting in a effectively defunct app. Moreover, GC only handles memory, not handles, DB connection etc. A real solution is not availble. > That would be a necessity for at least my platform which is compiled with > FPC - and certainly FCLWeb generated back-end apps too. It is not a problem of FPC, but of all applications in general. _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
