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Updates gem5 readme.

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Lukas Steiner
2020-07-03 10:28:06 +02:00
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DRAMSys/gem5/README.md
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@@ -1,62 +1,21 @@
## DRAMSys with gem5 ## DRAMSys with gem5
Install gem5 by following the instructions on the [gem5 wiki](http://gem5.org/Documentation#Getting_Started). Install gem5 by following the instructions in the [gem5 documentation](http://learning.gem5.org/book/part1/index.html). In order to allow a coupling without getting errors 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.
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 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].
read the documentation in the gem5 repository *util/tlm/README* and [1].
The main steps for building gem5 and libgem5 follow: The main steps for building gem5 and libgem5 follow:
```bash ```bash
scons build/ARM/gem5.opt scons build/ARM/gem5.opt
```
```bash
scons --with-cxx-config --without-python --without-tcmalloc build/ARM/libgem5_opt.so scons --with-cxx-config --without-python --without-tcmalloc build/ARM/libgem5_opt.so
``` ```
For MacOS: 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.
```bash Before you can run gem5 with DRAMSys it is mandatory to run gem5 first without DRAMSys and generate a configuration file *config.ini*, which will be the value of the second parameter passed to DRAMSys_gem5.
scons --with-cxx-config --without-python --without-tcmalloc build/ARM/libgem5_opt.dylib
```
In order to use gem5 with DRAMSys set the **GEM5** environment variable to the ### DRAMSys with gem5 Traffic Generator
path to gem5, for example in the *QtCreator under Projects > Build
& Run > Build Environment*:
```
GEM5=/path/to/gem5/
```
Example:
```
GEM5=$HOME/gem5_tnt/gem5
```
Optionally, export environment variables in your **~/.bashrc** file or
equivalent and open a new terminal:
```bash
# In this example gem5 is located at $HOME/gem5_tnt/gem5.
export GEM5=$HOME/gem5_tnt/gem5
# Add the folder containing libgem5_opt.so to the list where libraries should
# be searched for.
export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${GEM5}/build/ARM
```
The project file [DRAMSys.pro](DRAMSys/DRAMSys.pro) checks whether the
environment variable **GEM5** is defined or not and configures automatically
the corresponding build target **gem5** for QtCreator.
In order to run gem5 with DRAMSys it is mandatory to run gem5 first without
DRAMSys and generate a configuration file **config.ini** which will be the
value of the second parameter passed to DRAMSys_gem5.
### DRAMSys with gem5 traffic generator
In the following we will run a simple example with a gem5 traffic generator: In the following we will run a simple example with a gem5 traffic generator:
@@ -78,12 +37,10 @@ Base System Architecture:
``` ```
As mentioned before we first need to create a config.ini As mentioned before we first need to create a *config.ini* that represents the gem5 configuration. We do so by starting gem5 with the desired python configuration script.
that represents the gem5 configuration. We do so by starting gem5 with the
desired python configuration script.
```bash ```bash
cd gem5/utils/tlm/ cd gem5/util/tlm/
../../build/ARM/gem5.opt conf/tlm_slave.py ../../build/ARM/gem5.opt conf/tlm_slave.py
``` ```
@@ -92,16 +49,10 @@ cd gem5/utils/tlm/
"fatal: Can't find port handler type 'tlm_slave'" "fatal: Can't find port handler type 'tlm_slave'"
``` ```
The configuration file config.ini will be stored in the **m5out** directory. The configuration file *config.ini* will be stored in the *m5out* directory. Copy this configuration file to the building directory of DRAMSys where the
Copy this configuration file to the building directory of DRAMSys where the executable *DRAMSys_gem5* is located (*DRAMSys/build/gem5*).
executable **DRAMSys_gem5** is located:
``` Also the traffic generatior configuration file (*conf/tgen.cfg*) must be stored in a conf directory of this building directory (*DRAMSys/build/gem5/conf*).
dram.sys/build-DRAMSys-Desktop_Qt_5_7_0_clang_64bit-Debug/gem5
```
Also the traffic generatior configuration file (conf/tgen.cfg) must be stored
in a conf directory of this building directory.
Then the simulation can be started with: Then the simulation can be started with:
@@ -109,11 +60,9 @@ Then the simulation can be started with:
./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-example.json config.ini 1 ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-example.json config.ini 1
``` ```
Let the simulation run for some seconds and then stop it with **CTRL-C**. Let the simulation run for some seconds and then stop it with **CTRL-C**. Observe the output of the simulation in the Trace Analyzer. The trace database can be found in *DRAMSys/build/gem5*.
Observe the output of the simulation in the trace analyzer. The trace database
can be found inside the gem5 directory in the building directory.
### Gem5 SE mode and DRAMSys ### gem5 SE mode and DRAMSys
All essential files for some functional examples are provided. All essential files for some functional examples are provided.
@@ -135,13 +84,9 @@ Execute applications:
./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-gem5-se.json ../../DRAMSys/gem5/gem5_se/Bubblesort/config.ini 1 ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-gem5-se.json ../../DRAMSys/gem5/gem5_se/Bubblesort/config.ini 1
``` ```
Wait some minutes for the application to finish. Wait some minutes for the application to finish. The hello application binary was copied from gem5 repository. Other applications were obtained with [gem5.TnT].
The hello application binary was copied from gem5 repository. Command template for generating *.ini* configuration files follows:
Other applications were obtained with [gem5.TnT].
Command template for generating **.ini** configuration files follows:
```bash ```bash
build/ARM/gem5.opt configs/example/se.py \ build/ARM/gem5.opt configs/example/se.py \
@@ -155,10 +100,9 @@ An overview of the architcture being simulated is presented below:
![arch](images/gem5_se_mode_arch.png) ![arch](images/gem5_se_mode_arch.png)
**Note**: this is a gem5 generated file, therefore DRAMSys is omitted. DRAMSys is **Note**: This is a gem5 generated file, therefore DRAMSys is omitted. DRAMSys is directly connected as an external TLM slave.
direct connected as external tlm slave.
**Note**: workaround in se.py required: **Note**: Workaround in se.py required:
```python ```python
... ...
@@ -168,25 +112,18 @@ MemConfig.config_mem(options, system)
... ...
``` ```
A convenience script to execute several applications automatically A convenience script to execute several applications automatically [run.sh](DRAMSys/gem5/gem5_se/run.sh) is provided. Take a look and learn from it.
[**run.sh**](DRAMSys/gem5/gem5_se/run.sh) is provided . Take a look and learn
from it.
### [PARSEC] FS Mode ### [PARSEC] FS Mode
Full system simulation files for ARM available in [DRAMSys/gem5/gem5_fs/parsec_arm_minor_2c_8GB](DRAMSys/gem5/gem5_fs/parsec_arm_minor_2c_8GB). Full system simulation files for ARM are available in [DRAMSys/gem5/gem5_fs/parsec_arm_minor_2c_8GB](DRAMSys/gem5/gem5_fs/parsec_arm_minor_2c_8GB). Choose the benchmark in [parsec_arm_minor_2c_8GB.rcS](DRAMSys/gem5/gem5_fs/parsec_arm_minor_2c_8GB/parsec_arm_minor_2c_8GB.rcS) and edit the paths in [config.ini](DRAMSys/gem5/gem5_fs/parsec_arm_minor_2c_8GB/config.ini).
Choose the benchmark in [parsec_arm_minor_2c_8GB.rcS](DRAMSys/gem5/gem5_fs/parsec_arm_minor_2c_8GB/parsec_arm_minor_2c_8GB.rcS). All files required to build DRAMSys_gem5 and execute the simulation (gem5 library, benchmarks, disk image, etc.) can be obtained with [gem5.TnT].
Edit the paths in [config.ini](DRAMSys/gem5/gem5_fs/parsec_arm_minor_2c_8GB/config.ini). Start a simulation, e.g.:
All files required to build DRAMSys_gem5 and execute the simulation (gem5
library, benchmarks, disk image, etc.) can be obtained with [gem5.TnT].
Start a simulation. Example:
```bash ```bash
dram.sys/build/gem5$ ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/rgrsim-gem5-fs.json ../../DRAMSys/gem5/gem5_fs/parsec_arm_minor_2c_8GB/config.ini 1 DRAMSys/build/gem5$ ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/rgrsim-gem5-fs.json ../../DRAMSys/gem5/gem5_fs/parsec_arm_minor_2c_8GB/config.ini 1
``` ```
Optionally, open another terminal or tab and connect to gem5. Optionally, open another terminal or tab and connect to gem5.
@@ -195,7 +132,7 @@ Optionally, open another terminal or tab and connect to gem5.
$ telnet localhost 3456 $ telnet localhost 3456
``` ```
Note: the port may vary, gem5 prints it during initialization. Example: Note: The port may vary, gem5 prints it during initialization. Example:
``` ```
system.terminal: Listening for connections on port 3456 system.terminal: Listening for connections on port 3456
@@ -204,12 +141,7 @@ system.terminal: Listening for connections on port 3456
### [PARSEC] SE Mode ### [PARSEC] SE Mode
Binaries and gem5 SE configuration files for ARM available in [DRAMSys/gem5/gem5_se/parsec-arm](DRAMSys/gem5/gem5_se/parsec-arm). Binaries and gem5 SE configuration files for ARM available in [DRAMSys/gem5/gem5_se/parsec-arm](DRAMSys/gem5/gem5_se/parsec-arm). Use [gem5.TnT] to download parsec: Go to your *gem5.TnT* folder. Then go to *arch/arm* folder. Execute the script *build-parsec-serial.sh*.
Use [gem5.TnT] to download parsec. Example:
Go to your **gem5.TnT** folder. Then go to **arch/arm** folder. Execute the
script *build-parsec-serial.sh*.
```bash ```bash
gem5.TnT/arch/arm$ ./build-parsec-serial.sh gem5.TnT/arch/arm$ ./build-parsec-serial.sh
@@ -308,7 +240,7 @@ executable=../../DRAMSys/gem5/gem5_se/parsec-arm/blackscholes/blackscholes
Start a simulation. Example: Start a simulation. Example:
```bash ```bash
dram.sys/build/gem5$ ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/rgrsim-gem5-se.json ../../DRAMSys/gem5/gem5_se/parsec-arm/config.ini 1 DRAMSys/build/gem5$ ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/rgrsim-gem5-se.json ../../DRAMSys/gem5/gem5_se/parsec-arm/config.ini 1
``` ```
### Boot Linux with gem5 and DRAMSys ### Boot Linux with gem5 and DRAMSys
@@ -327,9 +259,9 @@ build/ARM/gem5.opt configs/example/fs.py \
--disk-image=linux-aarch32-ael.img --disk-image=linux-aarch32-ael.img
``` ```
The config.ini should be copied again to the DRAMSys_gem5 build folder. The *config.ini* should be copied again to the DRAMSys_gem5 build folder.
The simconfig should be changed in order to support storage and address offsets: The *simconfig* should be changed in order to support storage and address offsets:
``` json ``` json
{ {
@@ -341,11 +273,9 @@ The simconfig should be changed in order to support storage and address offsets:
"EnableWindowing": false, "EnableWindowing": false,
"ErrorCSVFile": "", "ErrorCSVFile": "",
"ErrorChipSeed": 42, "ErrorChipSeed": 42,
"NumberOfDevicesOnDIMM": 8,
"NumberOfMemChannels": 1,
"PowerAnalysis": false, "PowerAnalysis": false,
"SimulationName": "ddr3", "SimulationName": "ddr3",
"SimulationProgressBar": true, "SimulationProgressBar": false,
"ThermalSimulation": false, "ThermalSimulation": false,
"WindowSize": 1000, "WindowSize": 1000,
@@ -356,13 +286,13 @@ The simconfig should be changed in order to support storage and address offsets:
} }
``` ```
Then start DRAMSys_gem5 with the following command: Then start *DRAMSys_gem5* with the following command:
```bash ```bash
./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-example.json config.ini 1 ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-example.json config.ini 1
``` ```
For further sophisticated address mappings or scenarios checkout the file DRAMSys/gem5/main.cpp For further sophisticated address mappings or scenarios checkout the file *DRAMSys/gem5/main.cpp*.
#### Boot Linux with gem5 and DRAMSys Example #### Boot Linux with gem5 and DRAMSys Example
@@ -386,24 +316,19 @@ Open a new terminal and connect to gem5:
telnet localhost 3456 telnet localhost 3456
``` ```
Wait some minutes for the Linux boot process to complete then login. Username is Wait some minutes for the Linux boot process to complete then login. Username is **root**, no password required.
**root** no password required.
### DRAMSys with gem5 Elastic Traces ### DRAMSys with gem5 Elastic Traces
For understanding elastic traces and their generation, study the [gem5 To understand elastic traces and their generation, study the [gem5 wiki](https://www.gem5.org/documentation/general_docs/cpu_models/TraceCPU) and the paper [2]. Some predefined configs are stored [here](DRAMSys/gem5/configs) and the related
wiki](http://gem5.org/TraceCPU) and the paper [2]. python files are stored [here](DRAMSys/gem5/examples). This is an example for running an elastic trace:
Some predefined configs are stored [here](DRAMSys/gem5/configs) and the related
python files are stored [here](DRAMSys/gem5/examples).
This is an example for running an elastic trace:
```bash ```bash
./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-example.json ../../DRAMSys/gem5/configs/singleElasticTraceReplay.ini 1 ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-example.json ../../DRAMSys/gem5/configs/singleElasticTraceReplay.ini 1
``` ```
An overview of the architcture being simulated is presented below: An overview of the architecture being simulated is presented below:
![arch](images/singleElasticTraceReplay.png) ![arch](images/singleElasticTraceReplay.png)
@@ -425,109 +350,13 @@ An overview of the architcture being simulated is presented below:
![arch](images/dualElasticTraceReplay.png) ![arch](images/dualElasticTraceReplay.png)
For more spophisticated setups, even with l2 caches the proper ini file should be created. For more sophisticated setups, even with L2 caches the proper *.ini* file should be created.
If you need help please contact Matthias Jung.
### DRAMSys + GEM5 Log Collector Scripts ### DRAMSys + gem5 x86
Users can profit of running multiple **DRAMSys + gem5** simulations 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.
automatically with [gem5ilva.sh] for **gem5 syscall emulation (SE) mode** and
[gem5ilva_fs.sh] for **gem5 full system (FS) mode**.
Normally you will have to push your changes before running the scripts. This Change the architecture in the [CMake file](DRAMSys/gem5/CMakeLists.txt) to *X86*, rerun CMake and rebuild the project. Test with a hello world application for X86:
approach makes it easier to track back what exactly was tested by the scripts.
The scripts provide variables that tell **git** where to get the source
code from (repository URL), user name to be used (your git account),
**branch** to checkout (your working branch), etc. They are:
```bash
# Git info.
git_user="$USER"
git_branch="master"
git_url="git.eit.uni-kl.de:ems/astdm/dram.sys.git"
git_url_https="git.eit.uni-kl.de/ems/astdm/dram.sys.git"
```
The default values of the variables presented above assume that your git
account uses the same name as your user name in your PC. If that is not the
case, replace the value of the **git_user** variable with your git account
name. Similarly, replace the value of the variable **git_branch** with your
working branch name. There (in your working branch) you can push your changes
and/or new files before executing the scripts.
Open the script in QtCreator or another text editor of your choice and set the
variables with values that fit your needs.
Nevertheless, for some cases, you may want to have gem5 essential files out of
the main repository (usually because they are too big to be added to the
repository).
For those cases uncomment and properly set the variable
**external_inifile_path** in [gem5ilva_fs.sh].
This allows you to use a gem5 **config.ini** file external to the repository.
Note, however, that in this case it is up to you to keep track of your
simulation setup.
**Hint:**
[gem5.TnT] provides convenience scripts
to create gem5 disk images with benchmarking programs embedded.
### Coverage Check
Coverage check is enabled by default and can be disabled with an environment
variable.
```bash
export COVERAGE=true
```
### DRAMSys + GEM5 x86
Make sure you have built **gem5/build/X86/libgem5_opt.so**. If you build with
[gem5.TnT] you can check if the library exists as follows.
```bash
$ ls $HOME/gem5_tnt/gem5/build/X86/libgem5_opt.so
```
Change your ~/.bashrc.
```bash
# In this example gem5 is located at $HOME/gem5_tnt/gem5.
export GEM5=$HOME/gem5_tnt/gem5
# Add the folder containing libgem5_opt.so to the list where libraries should
# be searched for.
#export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${GEM5}/build/ARM
export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${GEM5}/build/X86
```
After that close QtCreator and all terminals.
Open a new terminal.
Change the architecture in [DRAMSys/gem5/gem5.pro](DRAMSys/gem5/gem5.pro).
```
gem5_arch = 'X86'
```
Delete the file **DRAMSys/DRAMSys.pro.user** from the repository.
```bash
$ rm DRAMSys/DRAMSys.pro.user
```
Open a new QtCreator.
Build DRAMSys as usual.
After building, go the the folder where *DRAMSys_gem5* is located.
Test with a hello world application for X86.
```bash ```bash
./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-gem5-se.json ../../DRAMSys/gem5/gem5_se/hello-x86/config.ini 1 ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/ddr3-gem5-se.json ../../DRAMSys/gem5/gem5_se/hello-x86/config.ini 1
@@ -641,21 +470,16 @@ Examples:
Check the folder [DRAMSys/gem5/gem5_se/MiBench](DRAMSys/gem5/gem5_se/MiBench) for all applications and configuration files. Check the folder [DRAMSys/gem5/gem5_se/MiBench](DRAMSys/gem5/gem5_se/MiBench) for all applications and configuration files.
### More AARCH64 Apps ### More AArch64 Apps
Full system simulation files for ARM available in [DRAMSys/gem5/gem5_fs/arm64](DRAMSys/gem5/gem5_fs/arm64). Full system simulation files for ARM available in [DRAMSys/gem5/gem5_fs/arm64](DRAMSys/gem5/gem5_fs/arm64). You can edit [arm64.rcS](DRAMSys/gem5/gem5_fs/arm64/arm64.rcS) to start an application and call *m5 exit* when it finishes.
You can edit [arm64.rcS](DRAMSys/gem5/gem5_fs/arm64/arm64.rcS) to start an application and call *m5 exit* when it finishes. Edit the paths in [config.ini](DRAMSys/gem5/gem5_fs/arm64/config.ini). All files required to build DRAMSys_gem5 and execute the simulation (gem5 library, benchmarks, disk image, etc.) can be obtained with [gem5.TnT].
Edit the paths in [config.ini](DRAMSys/gem5/gem5_fs/arm64/config.ini).
All files required to build DRAMSys_gem5 and execute the simulation (gem5
library, benchmarks, disk image, etc.) can be obtained with [gem5.TnT].
Start a simulation. Example: Start a simulation. Example:
```bash ```bash
dram.sys/build/gem5$ ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/rgrsim-gem5-fs.json ../../DRAMSys/gem5/gem5_fs/arm64/config.ini 1 DRAMSys/build/gem5$ ./DRAMSys_gem5 ../../DRAMSys/library/resources/simulations/rgrsim-gem5-fs.json ../../DRAMSys/gem5/gem5_fs/arm64/config.ini 1
``` ```
Optionally, open another terminal or tab and connect to gem5. Optionally, open another terminal or tab and connect to gem5.
@@ -664,7 +488,7 @@ Optionally, open another terminal or tab and connect to gem5.
$ telnet localhost 3456 $ telnet localhost 3456
``` ```
Note: the port may vary, gem5 prints it during initialization. Example: Note: The port may vary, gem5 prints it during initialization. Example:
``` ```
system.terminal: Listening for connections on port 3456 system.terminal: Listening for connections on port 3456
@@ -677,11 +501,5 @@ C. Menard, M. Jung, J. Castrillon, N. Wehn. IEEE International Conference on Emb
R. Jagtap, S. Diestelhorst, A. Hansson, M. Jung, N. Wehn, IEEE International Conference on Embedded Computer Systems Architectures Modeling and Simulation (SAMOS), 2016, Samos Island, Greece. R. Jagtap, S. Diestelhorst, A. Hansson, M. Jung, N. Wehn, IEEE International Conference on Embedded Computer Systems Architectures Modeling and Simulation (SAMOS), 2016, Samos Island, Greece.
[gem5.TnT]: https://github.com/tukl-msd/gem5.TnT [gem5.TnT]: https://github.com/tukl-msd/gem5.TnT
[gem5ilva.sh]: DRAMSys/library/resources/scripts/DRAMSylva/gem5ilva.sh
[gem5ilva_fs.sh]: DRAMSys/library/resources/scripts/DRAMSylva/gem5ilva_fs.sh
[Elwetritsch]: https://elwe.rhrk.uni-kl.de/
[DRAMSylva.sh]: DRAMSys/library/resources/scripts/DRAMSylva/DRAMSylva.sh
[DRAMSylva folder]: DRAMSys/library/resources/scripts/DRAMSylva
[configs_json]: DRAMSys/library/resources/scripts/DRAMSylva/configs_json
[MiBench]: http://vhosts.eecs.umich.edu/mibench/ [MiBench]: http://vhosts.eecs.umich.edu/mibench/
[PARSEC]: http://parsec.cs.princeton.edu/ [PARSEC]: http://parsec.cs.princeton.edu/

11
README.md
View File

@@ -360,12 +360,9 @@ An example follows.
- PowerDownTimeout (unsigned int) - PowerDownTimeout (unsigned int)
- currently unused - currently unused
### DRAMSys with Thermal Simulation ## DRAMSys with Thermal Simulation
The thermal simulation is performed by a **3D-ICE** [8] server accessed The thermal simulation is performed by a **3D-ICE** [8] server accessed through the network. Therefore users interested in thermal simulation during their DRAMSys simulations need to make sure they have a 3D-ICE server up and running before starting. For more information about 3D-ICE visit the [official website](https://www.epfl.ch/labs/esl/open-source-software-projects/3d-ice/).
through the network. Therefore users interested in thermal simulation during
their DRAMSys simulations need to make sure they have a 3D-ICE server up and
running before starting. For more information about 3D-ICE visit the [official website](https://www.epfl.ch/labs/esl/open-source-software-projects/3d-ice/).
#### Installing 3D-ICE #### Installing 3D-ICE
@@ -459,6 +456,10 @@ $ cd DRAMSys/build/simulator/
$ ./DRAMSys ../../DRAMSys/library/resources/simulations/wideio-thermal.json $ ./DRAMSys ../../DRAMSys/library/resources/simulations/wideio-thermal.json
``` ```
## DRAMSys with gem5
Further information about the usage of DRAMSys with gem5 can be found [here](DRAMSys/gem5/README.md).
## References ## References
[1] TLM Modelling of 3D Stacked Wide I/O DRAM Subsystems, A Virtual Platform for Memory Controller Design Space Exploration [1] TLM Modelling of 3D Stacked Wide I/O DRAM Subsystems, A Virtual Platform for Memory Controller Design Space Exploration