SOAP latency >= 20 ms

[drhok]

I did some tests with SOAP and JBoss 4.0.2 and it seems that a SOAP call to a stateless SessionBean takes at least 20 ms (if the SessionBean itself does nothing except for an empty method call).

This is astonishingly independent of the environment: Whether I use a 1GHz single CPU PC or a 3GHz 4-CPU Server on either Linux or WinXP, I always end up with 15 to 25 ms.

Where does the time go? It's definitely not the network latency, nor CPU overload.

Is there a way to speed it up? I need JBoss to respond in less than 5 ms.

Any help would be appreciated.

PS: I read in this thread http://www.jboss.org/index.html?module=bb&op=viewtopic&t=24284 that 20 ms is actually quite good and might be the end of the pole, but I would like it a bit faster, and 3 years have passed, so it might not be so difficult...

[genman]

"DrHok" wrote:

Where does the time go? It's definitely not the network latency, nor CPU overload.

How do you know it is not network latency? There a profiling tools to tell you what it's doing.

[drhok]

"genman" wrote:
How do you know it is not network latency?

A ping to the AS takes less than 0.1 ms. And other services on the AS (JBoss and non-JBoss) respond much faster. And it's independent on whether the client is local or remote.

"genman" wrote:
There a profiling tools to tell you what it's doing.

Which profiling tools are there? Could you recommend one?

[genman]

There's JProfile[r?] and JBoss Profiler. The former has a trial version you can use, and the latter is free but is potentially non-trivial to set up.