^The gem5 simulator is a modular platform for computer-system architecture research, encompassing system-level architecture as well as processor microarchitecture. Nathan Binkert, Bradford Beckmann, Gabriel Black, Steven K. Reinhardt, Ali Saidi, Arkaprava Basu, Joel. GEM5 runs on Linux only. No support is provided for MAC and Windows. sudo apt update (optional to update all the packages on Linux). mkdir gem5latest (Create a new directory to save GEM5 install). cd gem5latest (Goto this new directory). Learning gem5 is an open-source book and set of classes which covers how to get started using gem5. Gem5 is an open-source architectural simulator widely used in both industry and academia. The source for the Learning gem5 book can be found on github.Feel free to send a pull request if you notice any errors, or send me an email via the contact page.
This chapter covers the details of how to set up a gem5 developmment environment and build gem5.
Todo
Add a pointer to the gem5 docker image.In fact, we may want to have a docker image for each section.
Requirements for gem5¶
See gem5 requirements for more details.
- hg (Mercurial):
- The gem5 project uses Mercurial for version control.Mercurial is a distributed version control system (like git).It uses simple commands that should be familiar to svn users as well.More information about Mercurial can be found by following the link.Mercurial should be installed by default on most platforms.However, to install Mercurial in Ubuntu use
- gcc 4.6+
- You may need to use environment variables to point to a non-default version of gcc.For CSL machines, you can add the following to your .bashrc.local, assuming you’re using bash as your shell. Java download mac 10.6 7.On Ubuntu, you can install a development environment with
- SCons
- gem5 uses SCons as its build environment.SCons is like make on steroids and uses Python scripts for all aspects of the build process.This allows for a very flexible (if slow) build system.To get SCons on Ubuntu use
- Python 2.5+
- gem5 relies on the Python development libraries.On CSL machines, you may experience errors with the default Python version (2.5).To use version 2.7 you can add the following to your .bashrc.local:To install these on Ubuntu use
- SWIG 2.0.4+
- SWIG is a set of scripts and libraries that wraps C++ objects and exports them to scripting languages, like Python.gem5 uses SWIG to export C++ SimObjects to the Python configuration files.To install SWIG on Ubuntu useOn CSL machines, you can use swig found in
/s
:You may have to install SWIG manually.In that case, you can download the source from http://www.swig.org/download.html.Version 2.0.4 is known to work with gem5.Then, unpack, build, and install:
- protobuf 2.1+
- “Protocol buffers are a language-neutral, platform-neutral extensible mechanism for serializing structured data.”In gem5, the protobuf library is used for trace generation and playback.protobuf is not a required package, unless you plan on using it for trace generation and playback.
Getting the code¶
Change directories to where you want to download the gem5 source.Then, to clone the repository, use the
hgclone
command.You can now change directories to
gem5
which contains all of the gem5 code.Your first gem5 build¶
Let’s start by building a basic x86 system.Currently, you must compile gem5 separately for every ISA that you want to simulate.Additionally, if using ruby, you have to have separate compilations for every cache coherence protocol.
To build gem5, we will use SCons.SCons uses the SConstruct file (
gem5/SConstruct
) to set up a number of variables and then uses the SConscript file in every subdirectory to find and compile all of the gem5 source.SCons automatically creates a
gem5/build
directory when first executed.In this directory you’ll find the files generated by SCons, the compiler, etc.There will be a separate directory for each set of options (ISA and cache coherence protocol) that you use to compile gem5.How To Download Games On Mac
There are a number of default compilations options in the
build_opts
directory.These files specify the parameters passed to SCons when initially building gem5.We’ll use the X86 defaults and specify that we want to compile all of the CPU models.The main argument passed to SCons is what you want to build, build/X86/gem5.opt.In this case, we are building gem5.opt (an optimized binary with debug symbols).We want to build gem5 in the directory build/X86.Since this directory currently doesn’t exist, SCons will look in
build_opts
to find the default parameters for X86.(Note: I’m using -j9 here to execute the build on 9 of my 8 cores on my machine.You should choose an appropriate number for your machine, usually cores+1.)The output should look something like below:
When compilation is finished you should have a working gem5 executable at
build/X86/gem5.opt
.The compilation can take a very long time, often 15 minutes or more, especially if you are compiling on a remote file system like AFS or NFS.Common errors¶
Wrong gcc version¶
Update your environment variables to point to the right gcc version, or install a more up to date version of gcc.See Requirements for gem5.
Wrong SWIG version¶
Update your environment variables to point to the right SWIG version, or install a more up to date version of SWIG.See Requirements for gem5.
Python in a non-default location¶
If you use a non-default version of Python, (e.g., version 2.7 when 2.5 is your default), there may be problems when using SCons to build gem5.RHEL6 version of SCons uses a hardcoded location for Python, which causes the issue.gem5 often builds successfully in this case, but may not be able to run.Below is one possible error you may see when you run gem5.
To fix this, you can force SCons to use your environment’s Python version by running
python`whichscons`build/X86/gem5.opt
instead of sconsbuild/X86/gem5.opt
.More information on this can be found on the gem5 wiki about non-default Python locations: Using a non-default Python installation.M4 macro processor not installed¶
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If the M4 macro processor isn’t installed you’ll see an error similar to this:
Just installing the M4 macro package may not solve this issue.You may nee to also install all of the
autoconf
tools.On Ubuntu, you can use the following command.Developer(s) | Community |
---|---|
Initial release | August 2011; 9 years ago |
Stable release | |
Written in | C++, Python |
Operating system | Linux |
License | Revised BSD License |
Website | gem5.org |
The gem5 simulator is an open-sourcesystem-level and processor simulator. https://treescapes.weebly.com/home/download-windows-parallels-for-mac-torrent. It is utilized in academic research and in industry by companies such as ARM Research, AMD Research, Google, Micron, Metempsy, HP, and Samsung.[1]
History[edit]
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![How to download games on macbook air for free How to download games on macbook air for free](/uploads/1/2/6/7/126718309/779412425.jpg)
gem5 was born out of the merger of m5 (CPU simulation framework) and GEMS (memory timing simulator).[2]
Features[edit]
gem5 is an event-driven simulator with multiple execution modes.[2]
- full-system emulation (simulating the whole OS) and syscall emulation (just user-space is emulated)
- multiple ISAs (Alpha, ARM, SPARC, MIPS, POWER, RISC-V, and x86 ISAs)[1]
- timing model for the full cache hierarchy with support for custom coherence protocols
- simplistic CPU, in-order CPU, out-of-order CPU
- serialize/deserialization from checkpoints
References[edit]
- ^ ab'gem5: About'. Retrieved 14 November 2019.
- ^ abBinkert, Nathan; Sardashti, Somayeh; Sen, Rathijit; Sewell, Korey; Shoaib, Muhammad; Vaish, Nilay; Hill, Mark D.; Wood, David A.; Beckmann, Bradford; Black, Gabriel; Reinhardt, Steven K. (2011-08-31). 'The gem5 simulator'. ACM SIGARCH Computer Architecture News. 39 (2): 1. doi:10.1145/2024716.2024718.
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