Evaluation of caches

Hi,

I'm looking for some statistics concerning the evaluation of different cache implementations.

In particular, I'm interested in the number of conflict cache misses that occur when benchmarks are run on a processor with an instruction cache.

Will the direct-mapped cache perform worse than the set-associative cache (assume both caches have the same size), i.e. will there be more conflict misses for the direct-mapped cache?

Or will they perform almost the same? Please direct me to any papers dealing with this evaluation.

Regards, Tim

Reply to
Tim Frink
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I've seen references to a "2:1 cache rule of thumb" saying that a direct-mapped cache of size N has about the same miss rate as 2-way set associative cache of size N/2.

See

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This seems to be based on the book by Hennessey and Patterson, "Computer Architecture: A Quantitative Approach", which I have not read, sorry to say. According to the URL above, the book has some figures with real experimental data (SPEC92 benchmarks).

HTH,

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Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
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Reply to
Niklas Holsti

Thank you. I'm little bit surprised that set-associative caches are "twice" as good as direct-mapped ones. Is this rule really valid for instruction caches?

Unfortunately, the web site does not mention two important details: a) what sort of cache misses (I mean the categorization in compulsory, conflict and capacity misses) b) are these figures for data or instruction caches

Can someone help?

Tim

Reply to
Stephan Ceram

See slide 21 in

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This diagram separates misses according to type and associativity. It seems to be copied from the book that I referenced earlier in this thread.

Also,

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has a diagram showing miss rate as a function of cache size and associativity for the SPEC CPU2000 benchmark, from referenced work by Hill and Cantin. The discussion of this diagram considers the sort of the miss.

--
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
       .      @       .
Reply to
Niklas Holsti

Thank you. This is very helpful.

(I'm asking from a friend's computer.)

Tim

Reply to
Stephan Ceram

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Reply to
Tim Frink

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