Just a thought,
But might you not also just save your query results in some
intermediate format (serialization might work) that your JSP pages
could then use? It may not fit in well with your system, but it would
save from having to recompile pages.
At the other end of the spectrum, you could generate the HTML instead
of JSP and also save the intermediate step.
A large amount of JSP compilation overhead is out of tomcat's hands
since it's reliant on the java compiler.
-Paul
[EMAIL PROTECTED] wrote:
Hi All,
I'm curious if any of you have code that tests the performance of JSP
recompiles while tomcat is under load. I've read that some changes were
made in this area recently, and it directly effects a design I'm
considering.
If performance testing code exists, could someone send it to me?
Thanks,
Jason Henriksen
P.S.: (If you're curious how I got into this sitation, here's the
rationale: )
Basically, I'm treating the disk drive as a cache. I expect to have well
over 5,000 different query result pages, each of which could take over a
minute to generate because they require some fairly thick SQL. The good
news is that only about 100 of them will be 'active' at any given time.
The non-active pages, can be built, saved on disk and then safely ignored
(Thus being served with no database hit). However, when the object in the
DB changes I should be able to show the update on the JSP page within 15
minutines of the database change occuring.
My plan is to generate a page for each of my 5,000 objects up front and
then wait until a DB object changes. When it does, I'll regenerate the
page for just that object. That way everyone see's the new static page,
and the database can continue doing it's regular job of managing user
accounts, and other such non-cacheable business. (The disk cache is also
preferable to holding the results for all 5000 object queries in memory
because the results will be fairly large. My disk space is near infinite,
but my memory is not).
So if I have 1000 people looking at the results for Object A when it needs
to be re-compiled how will Tomcat respond? I know it does fine job
handling updated JSPs in a development environment, I'm curious how it's
expected to perform doing that kind of operation under load. (I understand
that my mileage my vary, I'm just looking for what you guys would expect to
happen, or do you suggest some other desgin?) Thus, I'm look for test-code
and/or result numbers.
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