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The fetch policy is only meaningful for SMT simulations. The "SingleThreaded" value is a placeholder which is the default, and is only supposed to be used in non-SMT simulations. Rather than have this enum value and have special checks for it in various places in O3, we can just eliminate it and set the default, which is still only meaningful in SMT simulations, be an SMT fetch policy. The DerivO3CPUParams::create() function would forcefully change the the fetch policy from "SingleThreaded" to "RoundRobin" anyway if there were more than one thread, so that can be the actual default instead of the shadow effective default. Change-Id: I458fda00b5bcc246b0957e6c937eab0c5b4563c3 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/35935 Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Maintainer: Gabe Black <gabeblack@google.com> 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.