"F. Scott Johnson" wrote:
> Hi,
> My question is: Does the servlet session object
> scale up to one hundred simultaneous users and
> approximately 10,000 unique sessions per day?
>
> This is running on a SPARC 4000 with 4 Gig of memory.
>
> The system currently works fine without servlet sessions,
> but we want to introduce sessions to accomplish
> several important objectives.
>
> If I shove all those users and hits into sessions, will
> it work or will it all blow up?
>
The answer, of course, is "it depends on your application." A couple of things
to think about:
* The number of unique sessions you are describing is not very
large, but the constraint that matters is the number of simultaneous
sessions. Again, 100 is not a big number.
* The session collection object used inside the servlet engine
itself is usually a Hashtable or something like it. So, access
to retrieve the session won't bog down with only 100. Likewise,
user data objects are stored in a Hashtable or something similar
inside each session for fast access.
* How much user data do you plan to have cached in the sessions
while the user is active? The sum total of the memory requirements
for all active sessions has to be stored in the heap memory of your
JVM -- you might have to set command line switches to increase
the maximum heap size.
* Can your CPU and database keep up with the processing demands
of 100 simultaneous users? The additional CPU overhead of sessions
is usually neglible compared to the CPU overhead of the app itself.
(In fact, if you use the session to cache information that would otherwise
need to be read from the database on every request, performance will
normally improve because accessing the cached data is much cheaper
than doing another database call.)
>
> -Scott
>
Craig McClanahan
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