The vertical axis is a model's speedup factor over sequential execution,
e.g., "30" = x30 = an improvement in performance of 3,000%. The horizontal axis
is the number of resources allowed for the model, in terms of branch paths
(a branch path is the dynamic code between two branches; its resources are
the functional units necessary to fully exploit the ILP [Instruction Level
Parallelism] in the path; this is very roughly equivalent to about
1-2 functional units per path).
SPECint92 benchmarks w/out sc
up to 100 million instructions simulated per benchmark
speedups shown are harmonic means over the five benchmarks' individual speedups
all instructions execute in one cycle
The hardware models simulated are combinations of the following:
"DEE" is Disjoint Eager Execution.
"SP" is Single Path speculative execution, the kind of speculation
in today's microprocessors.