在gem5上配置和运行PARSEC 2.1数据集

本篇介绍如何在GEM5模拟器中配置和运行PARSEC Benchmark （以ARPHA架构方式为例）。PARSEC Benchmark需要在GEM5中的全系统（full system）模式下运行，相关教程可参考：http://www.m5sim.org/PARSEC_benchmarks .

首先新建一个文件夹用于存储PARSEC Benchmark的disk image
```
 mkdir full_system_images
 cd full_system_images
```

下载初始的系统文件，并解压，再重命名文件夹（重命名可选）

 wget http://www.m5sim.org/dist/current/m5_system_2.0b3.tar.bz2
 tar jxf m5_system_2.0b3.tar.bz2
 mv m5_system_2.0b3 system

解压后，文件的目录结构如下：

 system/
     binaries/
          console
          ts_osfpal
          vmlinux
     disks/
          linux-bigswap2.img
          linux-latest.img

下载PARSEC Benchmark相关文件，并替换掉system文件夹中的相应文件

下载PARSEC对应的linux kernel文件，并替换掉 ‘system/binaries/vmlinux’

 cd ./system/binaries/
 wget http://www.cs.utexas.edu/~parsec_m5/vmlinux_2.6.27-gcc_4.3.4
 rm vmlinux
 mv vmlinux_2.6.27-gcc_4.3.4 vmlinux

下载PARSEC对应的PAL code文件，并替换掉 ‘system/binaries/ts_osfpal’

 wget http://www.cs.utexas.edu/~parsec_m5/tsb_osfpal
 rm ts_osfpal
 mv tsb_osfpal ts_osfpal

下载PARSEC-2.1 Disk Image并解压

 cd ../disks/
 wget http://www.cs.utexas.edu/~parsec_m5/linux-parsec-2-1-m5-with-test-inputs.img.bz2
 bzip2 -b linux-parsec-2-1-m5-with-test-inputs.img.bz2

进入gem5文件夹，修改两个文件（SysPaths.py 和 Benckmarks.py）配置parsec的路径和文件名

 cd ..
	
 cd configs/common/

打开SysPaths.py配置parsec disk image的完整路径：

 vim SysPaths.py

修改前：

 path = [ ’/dist/m5/system’, ’/n/poolfs/z/dist/m5/system’ ]

修改后：

 paths = [ '/dist/m5/system', '/home/lzy/gem5/gem5/full_system_images/system' ]

打开Benchmarks.py，修改image文件名：

 vim ./configs/common/Benchmarks.py

修改前：

 elif buildEnv['TARGET_ISA'] == 'alpha':
     return env.get('LINUX_IMAGE', disk('linux-latest.img'))

修改后：

 elif buildEnv['TARGET_ISA'] == 'alpha':
     return env.get('LINUX_IMAGE', disk('linux-parsec-2-1-m5-with-test-inputs.img'))

生成benchmark的script文件，用于运行benchmark

下载PARSEC script生成包，并解压：

 wget http://www.cs.utexas.edu/~parsec_m5/TR-09-32-parsec-2.1-alpha-files.tar.gz
 tar zxvf TR-09-32-parsec-2.1-alpha-files.tar.gz

生成script命令： mv TR-09-32-parsec-2.1-alpha-files PARSEC

 cd PARSEC

 ./writescripts.pl <benchmark> <nthreads>
 eg:  ./writescripts.pl canneal 4

有以下13种benchmark：

 blackscholes
 bodytrack
 canneal
 dedup
 facesim
 ferret
 fluidanimate
 freqmine
 streamcluster
 swaptions
 vips
 x264
 rtview

根据生成的script文件运行gem5：
```
 ./build/ALPHA/gem5.opt ./configs/example/fs.py -n 4 --script=/home/lzy/gem5/gem5/parsec/canneal_4c_simsmall.rcS --caches --l2cache -F 5000000000
```
得到如下结果：
Global frequency set at 1000000000000 ticks per second
warn: DRAM device capacity (8192 Mbytes) does not match the address range assigned (512 Mbytes)
info: kernel located at: /home/lzy/gem5/gem5/full_system_images/system/binaries/vmlinux
Listening for system connection on port 3456
……
新开一个窗口，使用telnet与gem5模拟系统进行交互
```
 telnet localhost 3456  
```
得到如下结果：
……
PARSEC Benchmark Suite Version 2.1
[HOOKS] PARSEC Hooks Version 1.2
Threadcount: 4
10000 swaps per temperature step
start temperature: 2000
netlist filename: /parsec/install/inputs/canneal/100000.nets
number of temperature steps: 32
locs created
locs assigned
Just saw element: 100000
netlist created. 100000 elements.
[HOOKS] Entering ROI
[HOOKS] Leaving ROI
Final routing is: 9.27137e+07
[HOOKS] Total time spent in ROI: 0.072s
[HOOKS] Terminating
Done :D

在gem5上配置和运行PARSEC 2.1数据集

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