在存储新时代重新审视吉姆·格雷的“五分钟法则”：基于第一性原理的视角.pdf

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1、Tong Zhang,ScaleFluxVikram S Mailthody,NVIDIARevisiting Jim Grays 5-Minute Rule in the Storage Next Era:A First-Principles PerspectiveRevisiting Jim Grays 5-Minute Rule in the Storage Next Era:A First-Principles PerspectiveTong Zhang,ScaleFluxVikram S Mailthody,NVIDIAOCP SPECIAL FOCUS:ARTIFICIAL INT

2、ELLIGENCE(AI)2The Famous 5-Min Rule 5-min rule(1985):“1KB every 5 minutes keep in memory”Jim Gray,a Turing Award-winning legend in systems researchIntuition:Break-even when Memory Rent($/page)=Disk Savings($/access)1.J.Gray&G.Putzolu,“The Five-minute Rule for Trading Memory for Disc Accesses,and the

3、 10 Byte Rule for Trading Memory for CPU Time,”SIGMOD872.J.Gray&G.Graefe,“The five-minute rule ten years later,and other computer storage rules of thumb,”SIGMOD973.R.Appuswamy et al.,“The five-minute rule 30 years later and its impact on the storage hierarchy.”Communications of the ACM 2019 Revisite

4、d many times:same formulation+evolving technologies Conclusion:break-even interval remains on the scale of minutes SSD=storage tier,no change3Revisit 5-Min Rule,Why Now?1.Formula inadequacyOld assumption:I/O-induced cost on processor/DRAM negligiblexNo longer valid under Storage-Next SSDs with 50M+I

5、OPSOld limitation:narrow vendor specsxIgnores broader design space2.New landscapeThroughput-centric AI workloads SSD DRAM in IOPS and bandwidth4Our Key Insights at a Glance1.Framework advancementA first-principles model capturing system-wide costs and concurrency,bridging prior gaps2.Break-even inte

6、rval redefinedCollapses from minutes to seconds,fundamentally changing cost/performance trade-offs3.Hierarchy shiftSSDs emerge as a first-class citizen in the AI-era memory/storage hierarchyGPU becomes the new I/O engine,reshaping AI system balance4.Practical impactStorage-Next-class break-even inte