Bad performance using multiple threads

Hi,

to improve the performance I started parallelizing (simple fork and join)
some tasks.
After testing the correctness of the output I found the performance on the
parallel tasks extremely bad.
In my testcase it is actually 4 times slower as normal single threaded
usage. I am using a standard dual core cpu running two threads parallel.
Is there anything known on bad multithreading performance using xmlbeans? In
my case there is a lot parallel reading on the same data. Readlocks are for
my usage not neccessary.
Thanks in advance for some help.

Here is some performance data:
1 Thread on dual core:
Creating graph with 2407 nodes, took: 375 ms
Routing 3170 connections, took: 31610 ms

4 Threads on dual core:
Creating graph with 601 nodes, took: 250 ms
Creating graph with 601 nodes, took: 266 ms
Creating graph with 604 nodes, took: 282 ms
Creating graph with 601 nodes, took: 282 ms
Routing 794 connections, took: 57172 ms
Routing 792 connections, took: 59625 ms
Routing 792 connections, took: 60469 ms
Routing 792 connections, took: 60485 ms

Bye Claus

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