SMT的先驅:DEC Alpha 21464。
特色:加倍執行單元數,跑4 Thread,如果程式平行化程度夠高,單一thread可以享受到超過一顆CPU的資源。
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjMsMDI2MhvsIRgS1IVjVhPlP5kCantVy7oBZXTtvC042CyvUI_M4wQaTQuyMtwupHiXIGrHe3arggOK5EZue1xuJcPAppPJyFctuelXv8lsTS_MyUXYtObDCt0QTpnI6QcQuLE/s400/4-Way_SMT_Double_Execution_Pipeline_20100124.png)
特色:沒有特色,就這樣了。
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhC2URcddkh7GlNyzRIHTxlQjOFRYl22jhQcSi9S_xLA40Q7kNtgpgwDTTlsyaytIBL6o7mKcWS1m4wuY9B-DCBMtI0LPsB1VJktD1nQudfUWDKREUd9pHRzoDN7x063jdJIjpy/s400/2-Way_SMT_Pipeline_20100124.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhaDWqVIbcJ5H8hQsmK4UHTgU52HpF7cTPhXJECRkGf8Kvs8WEuehb3EtVh1PCZ7rHZBk7cFMOzXgJC4uMhMkk3D-JheLtmPpzv8dub4AqGpQ85nt1jvDkKTxI0H7Kza7EJeUy9/s400/Dual_Core_2-Way_SMT_Pipeline_20100124.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJFArSvTNYEiE4sR_VkkJALHOADHi6beG1A5EdT9erMgE1kyc0aU_MVjymc1paN3IcG7S2zbbLDn1mKqF4OTAcLBjZZ7v6JEkIjyLF4hddn0Xnehs_vx9gVxB5Q9IFKngVvBWQ/s400/Cluster_MT_Pipeline_Shared_FPU_20100124.png)
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2 則留言:
21464根本沒有出來嘛,相同概念的東西做出來的也就是Power7了,4 Thread與翻倍的FPU。
然后Cluster MT的概念,Rock也是吧,而且更復雜,4 Core共享2 FPU,每個Core 2 Thread。至于結果,似乎是21464的命運再現。
而Bulldozer弱化FPU靠GPU的說法,我不贊同,畢竟Bulldozer的FPU是翻倍的,單一Thread可以享受到超過單CPU的FPU資源。相比縮水的ALU部分,FPU部分的設計才是水球兄所認同的SMT吧。丿
我覺得喔 bulldozer的設計思想應該偏向于SpMT 所以ALU數量并不是重點
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