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Partially reverts: https://gem5-review.googlesource.com/c/public/gem5/+/29372 where the `math.ceil` function was used to fix an issue where 0.5 was rounded to zero in python3. This has the side effect of giving incorrect clock frequences due to rounding errors. To demonstrate: ``` >>> import math >>> 1e-9*1000000000000 1000.0000000000001 >>> int(math.ceil(1e-9*1000000000000)) 1001 ``` The solution to this problem is to use Python's `decimal` module to round values. Issue-on: https://gem5.atlassian.net/browse/GEM5-616 Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> Change-Id: Ic76736ccb4b6b8c037103a34493aff7d9731d314 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/29577 Reviewed-by: Tiago Mück <tiago.muck@arm.com> Maintainer: Jason Lowe-Power <power.jg@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.