Process Scheduling and Program Monitoring on Transputers

. Parallel program monitoring is a key to success in parallel program development. We have developed a novel approach, called the logical clock approach, for the highly transparent monitoring of parallel programs. To apply the logical clock approach in monitoring occam programs on transputer-based systems, we first study the (micro-coded) process scheduler of the transputer, and then demonstrate how the information on process scheduling can be employed for correctly updating logical clocks and controlling inter-process communication in logical clock monitoring. Keywords: parallel programming environment, program monitoring, monitoring intrusiveness, transputer scheduling. 1. Introduction The transputer has hardware support for executing concurrent processes and for interprocess communication. Typically, parallel programs (e.g. occam programs) are first developed on a single transputer, and then mapped onto a network of transputers. Because of the existence of multiple concurrent proc..