RE: How to share objects in an ASP.NET application ???

From: Bill Borg (BillBorg_at_discussions.microsoft.com)
Date: 10/19/04 

Date: Tue, 19 Oct 2004 14:57:02 -0700

Tony, a few thoughts:

1. If you use a shared variable, you'll get a new instance of that
sortedlist each time IIS spins up a new instance of your app (which it may or
may not decide to do).

2. Tough to tell based on this where your bottleneck is. You might set some
start time/end time breakpoints to see what starts taking so long (e.g.
maintaining the sortedlist, excessive garbage collection due to poor string
handling, etc.). The memory required to store 2500 instances of that class
and the cpu time required to find items in it shouldn't be that
oppressive--I'm guessing the problem is somewhere else (unless you're
supporting a ton of hits/second or are otherwise way underpowered).

3. Regardless, your design isn't built to scale well, because you keep
hanging onto all the web site info. You need a way to flush it periodically
and start over.

4. Why hold onto all the web site information in memory? Why not just write
each "hit" to disk? I presume at some point you have to do that anyway so you
can package it up for your customers. Yes, slightly slower to insert a row
each time, but you'll avoid a whole host of other problems and scalability
should go way up (at least it will be more linear). You could also save up
your writes in cache and persist them when traffic is light, maybe persist
each customers info in a tiny xml file for the day. etc.

5. One way to create a global repository across all instances of your app is
to write a separate web service.

hth,

Bill

"Tony Fonager" wrote:

> I am currently developing a statistics system in ASP.NET, and need to share
> information about the customers websites, in this application.
>
> (I have simplified my code, to make my project easier to explain.)
>
> The simple version of the system is like this : A customer inserts HTML code
> on his webpage, which contacts my statistics server each time the customers
> website recieves a hit - like a classic "register website traffic" system.
>
> When the customers hit reaches my web application, I need to maintain info
> and state about the customers website - therefore I have a "website" class,
> which hold information about the customer website (raw hits, unique hits,
> website name, hit today ect).
>
> So the first time a customer hits my servers, I need to instantiate an
> instance of the website class, and update the information in this class. Next
> time I recieve a request for the same customer, I only need to update the
> websites information in the instance of that class.
>
> So, here is a picture of how it works today, when the first hit comes in :
>
> 1. Customer #100 sends a request to my statistics application.
> 2. I have no information about customer #100, so I instantiate a new
> instance of the "website" class.
> 3. I update information, and sets the "unique hits" variable to 1 (as this
> is the first hit).
>
> After this, all hits coming after the first hit, only updates information in
> the "website" class (ie. adds 1 to the "unique hits" variabel) - like in step
> 3.
>
> I think (and hope) all the above is readable and understandable.
>
> My problem now, is how I share these website classes in the global
> application ????
>
> Today I have a shared collection, which hold each instance of the website
> class - like this :
>
> public shared websites as new sortedlist
>
> This shared collection can be accessed from all classes in my application,
> and actually this works fine.
>
> But, when my collection of websites reaches a certain limit (about 2500
> "website" classes), the application starts to become VERY slow, and after
> 10-15 minutes it totally slows down and becomes useless.
>
> And listen to me - we are talking VERY SLOW here - it runs on dual xeon HP
> server, so hardware is enough for testcase ...
>
> My question is now, if I am doing this the right way ??? How are you guys
> shared objects among pages in an ASP.NET application ???
>
> Is there are correct way to share objects globally in an ASP.NET application ?
>
>
> -
> Regards,
> Tony Fonager, Denmark
>

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