Abstract for Seng, Tullsen, Cai "Power-Sensitive Multithreaded Architecture"
The power consumption of microprocessors is becoming increasingly
important in design decisions, not only in mobile processors, but
also now in high-performance processors. Power-conscious
design must therefore go beyond technology and low-level design,
but also change the way modern processors are architected.
A multithreading processor is attractive in the context of low-power
or power-constrained devices for many of the same reasons that
enable its high throughput. Primarily, it supplies extra parallelism
via multiple threads, allowing the processor to rely much less
heavily on speculation. We show that a simultaneous multithreading
processor utilizes up to 22% less energy per instruction than
a single-threaded architecture. We also explore other power
optimizations that are particular to multithreaded architectures, either
because they are unavailable to or unreasonable for single-thread