A distributed memory LAPSE: parallel simulation of message-passing programs

This paper describes a tool, LAPSE (Large Application Parallel Simulation Environment), that allows one to use a small number of parallel processors to simulate the behavior of a message-passing code running on a large number of processors, for the purposes of scalability studies and performance tuning. LAPSE is implemented on the Intel Paragon, and has achieved small slowdowns (relative to native code) and high speed-ups on large problems.