Why would computers transfer data and instructions form main memory to cache in blocks when this means a single cache miss may overwrite a lot was put on hold as too broad. While I can see it is off-topic for StackOverflow, I suspect it is not too broad and migration (say to the Computer Science SE) might be reasonable.

I think my answer is more-or-less complete (addressing the "too many answers" issue) and not extremely long (a little over 3300 characters).

The question is not a great question even for the CS SE, but it is question that seems to be generally answered with a simple "larger cache blocks exploit the spatial locality that is typical in most programs" and a somewhat broader answer seems likely to be helpful.

(Knowing that the question was off-topic on StackOverflow, I should not have given an answer [encouraging off-topic posts is wrong] and perhaps flagged the question for migration. I am not sure if CS SE would accept this question, but CS SE does handle a fair number of similarly simple computer architecture questions.)

  • Does the OP really mean "instructions form" or do they mean "instructions from"? – George Stocker Mar 18 '14 at 17:09
  • @RobertHarvey First "on hold" replaced "closed" (for a period of time) to encourage fixing questions. Second, my point is I do not think it qualifies as "too broad" ("off-topic", yes, but not "too broad"). – Paul A. Clayton Mar 18 '14 at 17:23
  • @GeorgeStocker Yes, the OP meant "from" not "form". – Paul A. Clayton Mar 18 '14 at 17:25
  • Good to know, I don't know enough about the topic to know if that means something specific in the context of the OP's question. – George Stocker Mar 18 '14 at 17:25

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