Godmar Back, Wilson C. Hsieh, Jay Lepreau
Technical Report UUCS-00-010
The Flux Research Group
Department of Computer Science
University of Utah
50 S. Central Campus Drive Rm. 3190
Salt Lake City, Utah 84112-9205
The KaffeOS architecture supports the OS abstraction of a process in a Java virtual machine. Each process executes as if it were run in its own virtual machine, including separate garbage collection of its own heap. The difficulty in designing KaffeOS lay in balancing the goals of isolation and resource management against the goal of allowing direct sharing. Overall, KaffeOS is up to 11% slower than the JVM on which it is based, which is an acceptable penalty for the safety that it provides. KaffeOS is substantially slower than commercial JVMs, but exhibits much better performance scaling in the presence of uncooperative code.