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Add an accuracy and coverage stat for the prefetchers. Accuracy is defined as the ratio of the number of prefetch request that have been counted as useful over the number of prefetch request issued. Accuracy tells whether the prefetcher is producing useful requests or not. Coverage is defined as the ratio of of the number of prefetch request that have been counted as useful over the number of demand misses if there was no prefetch, which is counted as the number of useful prefetch request plus the remaining demand misses. Due to the way stats are defined in the cache, I have to add a stat to count the number of remaining demand misses directly in the prefetcher stat. Demand is defined as being one of this request type: ReadReq, WriteReq, WriteLineReq, ReadExReq, ReadCleanReq, ReadSharedReq. Coverage tells what part of misses are covered by the prefetcher. Change-Id: I3bb8838f87b42665fdd782889f6ba56ca2a802fc Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47603 Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br> Maintainer: Daniel Carvalho <odanrc@yahoo.com.br> Tested-by: kokoro <noreply+kokoro@google.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, SWIG, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/documentation/general_docs/building for more details and options. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.