Evolving Weak Memory Models for Evolving Architectures

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" summary

Empirical litmus testing shows load buffering visible on most GPUs with observed rates from ~0.001% (Intel) to >1% (AMD); a methodology mutates candidate executions and stresses many-thread environments to make weak behaviors appear and then re-runs original tests. The effort finds concrete bugs: AMD mistranslates release–acquire, coherency bugs on Intel/ARM/Nvidia and integrates tests into the WebGPU CTS. GPUs lack fair forward‑progress guarantees (except some Nvidia cases), motivating scoped models for GPU-friendly algorithms like prefix scan.

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" chapters (12)

1. 0:00Introduction
2. 1:10Load buffering on GPUs
3. 2:54Evolving weak memory models
4. 3:57Testing GPU memory models
5. 5:41Stress testing weak behaviors
6. 6:46New rules for GPU memory
7. 8:55Forward progress on GPUs
8. 10:18GPU memory model research
9. 11:41Heterogeneous processors
10. 13:24Simplifying GPU memory
11. 13:45Formal analysis directions
12. 14:08Q&A