Well, I gave the Java VM 6 out of 8 GB of memory (configured in /etc/default/jenkins).
It is eaten up in minutes.
The Jenkins master just controls OSX, Linux and a Windows slave.
It copies the artifacts back to the master.
A heap dump can't be provided at the moment since I downgraded to version 1.558 again since we are about to ship our new camera and managing all our builds including those for our FPGAs (~12h each) over Jenkins.
Maybe when the product is shipped I could give it a chance.
Maybe Ed Meagher could provide one?!
I'm seeing the same thing with 1.561 and java "jdk1.7.0_21"