compulsory miss

Question

To reduce compulsory misses , increase the cache line size

How does that work

ive already read some of the discussions here but still not clear with how it works

Comments

lets cache memory have 30 bits and line size take 12 bits  , bits for number of blocks = 30-12= 18 bits
means 2¹⁸ cache blocks , every first entry to block is compulsory miss . So compulsory misses= 2¹⁸

now the increase size of line  = 18 bits 

means bits for number of blocks = 30-18= 12 bits 

means 2¹² cache blocks , every first entry to block is compulsory miss . So compulsory misses= 2¹²

hence missed reduce from 2¹⁸ to 2¹²

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Shouldn't this increase the conflict miss afterwards, since your total cache size is fixed?

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@shatadru

 

where do you have dynamic cache size ?