Analyzing multivariate data in crossover designs using permutation tests.
We have developed two distributed applications which are routinely run on our workstation cluster. RDRAW is used for real time intraoperative monitoring of brain and spinal cord function and has been used to monitor more than 1000 surgical procedures to date. ENHANCE produces real time enhancement of ouroscopy and ultrasound images. Both applications depend on Parallel Virtual Machine (PVM) for naming services and message transport and queueing. The virtual machine typically includes 45 HP 9000/700 workstations located in Pittsburgh, Washington, D.C., and New York City, and routinely delivers a sustained computational speed of 200-500 MFLOP's. This represents 25%-60% of the total system capability and has produced no noticeable slowdown on any of the individual machines. These applications demonstrate the use of our cluster as a distributed memory multiprocessor (ENHANCE) and take advantage of the dividends ooered by a message passing implementation including naming services and direct user control of data distribution.