> From: CrystalCracker [mailto:[email protected]]
> Given that each request takes 2 seconds on average. Among
> them, some of them
> take less than 500ms, and some take as long as 5 seconds or
> even a little more sometimes.
>
> How many such concurrent request would a tomcat server
> running on a double quad-core server handle?
It's totally dependent on your application. If a 5-second request is CPU-bound
for all that time, very few. If it's mostly waiting for data to be returned
from a database or web service, probably quite a lot - but you may be
saturating the database. At the extreme, I could write a webapp that slept for
500ms to 5 seconds, then returned some fixed output - almost no memory use,
almost no CPU use, and it would scale very well indeed.
There is only one way to find out how your application will perform: measure
it. And measure end-to-end, with measurements of load-balancers, databases,
web service back-ends and so on. Anything else won't give you a true picture.
There is one general point, though. You'll need to set up enough threads on
your connector that you can handle that degree of concurrency, or Tomcat will
become a bottleneck.
- Peter
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