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DRAMSys with gem5

Install gem5 by following the instructions in the gem5 documentation. In order to allow a coupling without running into problems we recommend to use commit a470ef5. Optionally, use the scripts from gem5.TnT to install gem5, build it, get some benchmark programs and learn more about gem5.

In order to understand the SystemC coupling with gem5 it is recommended to read the documentation in the gem5 repository util/tlm/README and [1].

The main steps for building gem5 and libgem5 follow:

$ cd gem5
$ scons build/ARM/gem5.opt
$ scons --with-cxx-config --without-python --without-tcmalloc build/ARM/libgem5_opt.so

In order to use gem5 with DRAMSys export the GEM5 environment variable (gem5 root directory) and add the path of the library to LD_LIBRARY_PATH, then rerun CMake and rebuild the DRAMSys project.

DRAMSys with gem5 ARM SE Mode

All essential files for a functional example are provided. Execute a hello world application:

$ cd DRAMSys/build/gem5
$ ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-gem5-se.json ../../DRAMSys/gem5/gem5_se/hello-ARM/config.ini 1

A Hello world! message should be printed to the standard output.

DRAMSys with gem5 X86 SE Mode

Make sure you have built gem5/build/X86/libgem5_opt.so. Add the path of the library to LD_LIBRARY_PATH and remove the path of the ARM library.

Change the architecture in the CMake file to X86, rerun CMake and rebuild the project. Test with a hello world application for X86:

$ cd DRAMSys/build/gem5
$ ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-gem5-se.json ../../DRAMSys/gem5/gem5_se/hello-X86/config.ini 1

A Hello world! message should be printed to the standard output.

DRAMSys with gem5 TraceCPU and Elastic Traces

In order to understand elastic traces and their generation you should take a look at the gem5 wiki and the paper [2].

All essential files for a functional example are provided. The example can be executed as follows:

$ cd DRAMSys/build/gem5
$ ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-example.json ../../DRAMSys/gem5/gem5_etrace/config.ini 1

References

[1] System Simulation with gem5 and SystemC: The Keystone for Full Interoperability
C. Menard, M. Jung, J. Castrillon, N. Wehn. IEEE International Conference on Embedded Computer Systems Architectures Modeling and Simulation (SAMOS), July, 2017, Samos Island, Greece.

[2] Exploring System Performance using Elastic Traces: Fast, Accurate and Portable
R. Jagtap, S. Diestelhorst, A. Hansson, M. Jung, N. Wehn. IEEE International Conference on Embedded Computer Systems Architectures Modeling and Simulation (SAMOS), July, 2016, Samos Island, Greece.