---
title: "Samuel Williams"
type: "entity"
entity_kind: "person"
status: "hub"
canonical_name: "Samuel Williams"
aliases: []
first_seen: "2026-07-12T00:00:00.000Z"
writer_model: "claude-sonnet-5"
connects_to: ["roofline model","arithmetic intensity","memory wall","David Patterson"]
seek_code_commit: "729ee25"
---


Computer architecture researcher (UC Berkeley / Lawrence Berkeley National Laboratory) who, with Andrew Waterman and David Patterson, published "Roofline: An Insightful Visual Performance Model for Multicore Architectures" (2009), originating the **roofline model** and its central metric, arithmetic (operational) intensity — the ratio of arithmetic operations to bytes moved from memory that determines whether a workload is compute-bound or memory-bound. Matters to this vault as the named originator of the formal framework that governs the vault's entire compute-vs-memory-bound cluster: it is the general theory [[claim-tpu-most-nn-workloads-memory-bandwidth-bound|Google's TPU work]] applies directly and the [[claim-llm-inference-prefill-decode|LLM decode-is-memory-bound observation]] silently instantiates as a special case.

## References
- [[claim-roofline-model-compute-bound-vs-memory-bound]]
- [[claim-compute-outpaces-memory-bandwidth-ai-hardware-scaling]]
- Captures: 2026-07-11-hop-systolic-array-heart, 2026-08-12-bipartite-two-things-this-vault-knows-in-different (entity-candidate mention only)