作者VB2005 (DaiJouBu)
看板Grad-ProbAsk
標題[理工] [計組]3C.觀念
時間Tue Dec 18 00:01:42 2012
assume the three caches below,each consisting of 16 word. give the
series of address references as word address.. 2 3 4 16 18 16 4 2 .
Please ablel each reference as a hit or a miss ...
Assuming that lru is used for cache relacement algorithm and all the
cache are initially empty.
(a) a direct-mapped cache with 16 one-word blocks;
計算後…
T I
2 0 2 MISS compulsory
3 0 3 MISS compulsory
4 0 4 MISS compulsory
16 1 0 MISS compulsory
18 1 2 MISS conflict (*)
16 1 0 HIT
4 0 4 HIT
2 0 2 MISS conflict
問題:
(*) 答案給 compulsory 為什麼?
(我的想法是 I=2出現過了,但T不對。所以是conflict) 請指教,謝謝。
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→ BaaaSwin:只要這個block沒被讀取過就是compulsory 12/18 00:03
→ VB2005:原來。謝謝你的回答… 12/18 00:05
→ BaaaSwin:我還因為這題跟張帆盧很久xD 12/18 00:06
→ VB2005:XD 12/18 00:06