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The name of the build is opt, so it should be fully optomized. Also, the fast build, the only one with LTO historically, is dangerous to use since it disables many error checks. I personally run gem5 many times while developing, iterating and trying to fix bugs, and so want it to run quickly then too, not just the final time when collecting results. Also, since they mirror the opt build, the perf and prof builds also have LTO options added. This has the nice side effect of speeding up the build time of build/X86 significantly (6:20 -> 4:27) due to parallelization of the link, and reduces the size of the build/X86 directory (with debug compression enabled) from 3.4GB to 2.8GB. The size of build/X86/python/_m5 is still 1.6GB, so still more than half of the total size of build/X86. Change-Id: I8feabf99454693fdd100d9e1a64fdeae53362f75 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40815 Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Earl Ou <shunhsingou@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.