We investigate conservative parallel discrete event simulations for logical
circuits on shared-memory multiprocessors. For a first estimation of the p
ossible speedup, we extend the critical path analysis technique by partitio
ning strategies. To incorporate overhead due to the management of data stru
ctures, we use a simulation on an ideal parallel machine (PRAM). This simul
ation can be directly executed on the SB-PRAM prototype, yielding both an i
mplementation and a basis for data structure optimizations. One of the majo
r tools to achieve these optimizations is the SB-PRAM's hardware support fo
r parallel prefix operations. Our reimplementation of the PTHOR program on
the SB-PRAM yields substantially higher speedups than before.