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If supported this will compress the debug information in object files, libraries, and binaries. This decreases the size of the build/ARM directory from 11GB to 7.2GB. Because the benefit of this mechanism depends on the performance and capacity of the build machine's storage, it can be disabled with the --no-compress-debug scons flag. For instance if your storage is very fast, writing out a larger binary may take less time than compressing that same number of bytes, plus the time to write out the smaller file. This feature seems to make our presubmit test machine run out of memory when trying to build gem5, and so is disabled in the testing scripts. Change-Id: I71919062d23742b7658918b0fa9c4d91d0521fbf Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40715 Reviewed-by: Gabe Black <gabe.black@gmail.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Gabe Black <gabe.black@gmail.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.