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Coursera- Lab 4 Solved
Contents
Lab 4: Cache Geometries........................................................................................................................ 1
Overview........................................................................................................................................ 1
Instructions..................................................................................................................................... 1
Your Tasks....................................................................................................................................... 2
Submitting Your Work....................................................................................................................... 2
Lab 4: Cache Geometries
Overview
Chip D. Signer, Ph.D, is trying to reverse engineer a competitor’s microprocessors to discover their cache geometries and has recruited you to help. Instead of running programs on these processors and inferring the cache layout from timing results, you will approximate his work by using a simulator.
This lab should be done on a 64-bit machine. Use the provided VM or your own personal 64-bit computer (but at least check your solutions on the VM).
Instructions
Specifically, each of these “processors” is provided as an object file (.o file) against which you will link your code. See the file mystery-cache.h for documentation of the function interface that these object files export. Your job is to fill in the function stubs in cache-test-skel.c which, when linked with one of these cache object files, will determine and then output the cache size, associativity, and block size. Some of the provided object files are named with this information (e.g. cache_64c_2a_16b.o is a 64 KB capacity, 2-way set-associative cache with 16B blocks) to help you check your work. There are also 4 mystery cache object files, whose parameters you must discover on your own.
You can assume that the mystery caches have sizes that are powers of 2 and use a least recently used replacement policy. You cannot assume anything else about the cache parameters except what you can infer from the cache size. Finally, the mystery caches are all pretty realistic in their geometries, so use this fact to sanity check your results.
Perform an update to your course-materials directory on the VM by running the update-course command from a terminal window. On the script’s success, you should find the provided code for lab4 in your course-materials directory. As a convenience, here is an archive of the course-materials directory as of this lab assignment: lab4.tar.gz.
The provided Makefile includes a target cache-test. To use it, set TEST_CACHE to the object file to link against on the command line - i.e. from within the lab4 directory run the command:
make cache-test TEST_CACHE=cache_64c_2a_16b.o
This will create an executable cache-test that will run your cache-inference code against the supplied cache object. Run this executable like so:
./cache-test
and it will print the results to the screen.
1
Your Tasks
Complete the 3 functions in cache-test-skel.c which have /* YOUR CODE GOES HERE */ comments in them.
Your functions should accurately determine the geometry of each of the four mystery caches as well as the caches that give away their geometries in their filenames.
Lab 4: Cache Geometries........................................................................................................................ 1
Overview........................................................................................................................................ 1
Instructions..................................................................................................................................... 1
Your Tasks....................................................................................................................................... 2
Submitting Your Work....................................................................................................................... 2
Lab 4: Cache Geometries
Overview
Chip D. Signer, Ph.D, is trying to reverse engineer a competitor’s microprocessors to discover their cache geometries and has recruited you to help. Instead of running programs on these processors and inferring the cache layout from timing results, you will approximate his work by using a simulator.
This lab should be done on a 64-bit machine. Use the provided VM or your own personal 64-bit computer (but at least check your solutions on the VM).
Instructions
Specifically, each of these “processors” is provided as an object file (.o file) against which you will link your code. See the file mystery-cache.h for documentation of the function interface that these object files export. Your job is to fill in the function stubs in cache-test-skel.c which, when linked with one of these cache object files, will determine and then output the cache size, associativity, and block size. Some of the provided object files are named with this information (e.g. cache_64c_2a_16b.o is a 64 KB capacity, 2-way set-associative cache with 16B blocks) to help you check your work. There are also 4 mystery cache object files, whose parameters you must discover on your own.
You can assume that the mystery caches have sizes that are powers of 2 and use a least recently used replacement policy. You cannot assume anything else about the cache parameters except what you can infer from the cache size. Finally, the mystery caches are all pretty realistic in their geometries, so use this fact to sanity check your results.
Perform an update to your course-materials directory on the VM by running the update-course command from a terminal window. On the script’s success, you should find the provided code for lab4 in your course-materials directory. As a convenience, here is an archive of the course-materials directory as of this lab assignment: lab4.tar.gz.
The provided Makefile includes a target cache-test. To use it, set TEST_CACHE to the object file to link against on the command line - i.e. from within the lab4 directory run the command:
make cache-test TEST_CACHE=cache_64c_2a_16b.o
This will create an executable cache-test that will run your cache-inference code against the supplied cache object. Run this executable like so:
./cache-test
and it will print the results to the screen.
1
Your Tasks
Complete the 3 functions in cache-test-skel.c which have /* YOUR CODE GOES HERE */ comments in them.
Your functions should accurately determine the geometry of each of the four mystery caches as well as the caches that give away their geometries in their filenames.
1 file (145.0KB)
