Amdahl: the serial fraction limits parallel speedup

What changed

Architects could quantify why parallel resources alone fail to remove serial bottlenecks.

Scientific scope

Exact 1967 conference paper; Gustafson scaled-workload interpretation and later implementations excluded.

Evidence

The linked sources identify this contribution and its scope. WRS has not independently reconstructed the scientific claims. The record is the exact 1967 AFIPS conference paper. Later named formulations, Gustafson’s scaled-speedup argument, multicore measurements and hardware implementations remain separate.

Contributors

• Gene M. Amdahl · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.

• Amdahl, Validity of the Single Processor Approach
• Crossref record for Amdahl paper

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

Full scientific record · Browse contribution grades · Request a correction