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Curtis Dunham 87b9da2df4 sim: tag-based checkpoint versioning This commit addresses gem5 checkpoints' linear versioning bottleneck. Since development is distributed across many private trees, there exists a sort of 'race' for checkpoint version numbers: internally a checkpoint version may be used but then resynchronizing with the external tree causes a conflict on that version. This change replaces the linear version number with a set of unique strings called tags. Now the only conflicts that can arise are of tag names, where collisions are much easier to avoid. The checkpoint upgrader (util/cpt_upgrader.py) upgrades the version representation, as one would expect. Each tag version implements its upgrader code in a python file in the util/cpt_upgraders directory rather than adding a function to the upgrader script itself. The version tags are stored in the 'Globals' section rather than 'root' (as the version was previously) because 'Globals' gets unserialized first and can provide a warning before any other unserialization errors can occur.		2015-09-02 15:23:30 -05:00
build_opts	scons: Do not build the InOrderCPU	2015-01-20 08:12:45 -05:00
configs	ruby: remove random seed	2015-09-01 15:50:33 -05:00
ext	ext: Add the NoMali GPU no-simulation library	2015-07-07 10:03:13 +01:00
src	sim: tag-based checkpoint versioning	2015-09-02 15:23:30 -05:00
system	arm: Add support for ARMv8 (AArch64 & AArch32)	2014-01-24 15:29:34 -06:00
tests	stats: updates due to recent changes.	2015-08-30 12:24:19 -05:00
util	sim: tag-based checkpoint versioning	2015-09-02 15:23:30 -05:00
.hgignore	ext: Add a McPAT regression tester	2014-06-04 07:48:20 -07:00
.hgtags	Added tag stable_2015_04_15 for changeset e17949745150	2015-04-15 16:04:37 -05:00
COPYING	copyright: Add code for finding all copyright blocks and create a COPYING file	2011-06-02 17:36:07 -07:00
LICENSE	copyright: Add code for finding all copyright blocks and create a COPYING file	2011-06-02 17:36:07 -07:00
README	misc: README direct to website for dependencies	2014-08-26 10:12:04 -04:00
SConstruct	ext: Add the NoMali GPU no-simulation library	2015-07-07 10:03:13 +01:00

README

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/Introduction, and for
more information about building the simulator and getting started
please see http://www.gem5.org/Documentation and
http://www.gem5.org/Tutorials.

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/Dependencies 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 ALPHA, 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/Build_System for more details and options.

With the simulator built, have a look at
http://www.gem5.org/Running_gem5 for more information on how to use
gem5.

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. Please see the gem5 download page for these items at
http://www.gem5.org/Download

If you have questions, please send mail to gem5-users@gem5.org

Enjoy using gem5 and please share your modifications and extensions.