SimpleScalar Tool Set, Version 2

CSE 323Department of Computer

Engineering

A Computer Architecture Simulator

What is an architectural simulator? Tool that reproduces the behavior of a computing device

What is SimpleScalar? A simulator that performs fast, flexible and accurate

simulation of modern processors that implement the SimpleScalar Architecture.

What is a SimpleScalar Architecture? A close derivative of the MIPS architecture.

Simulation How does the simulation? Takes binaries compiled for the SimpleScalar

architecture and simulates their execution on processor simulator.

Simulation Suite Overview

Binaries? How to create binaries for the

architecture? The simulator provides sets of precompiled

binaries. Also provides a modified version of GCC that

allows you to compile your own binaries.

SimpleScalar Overview

Results

Simulator source

Host C compiler

How to make a binary for SimpleScalar You will be working on TUX machine

(IP:10.2.7.254) with your accounts and passwords. SimpleScalar is located in /usr/local/ Copy the makefile into your own directory.

cp /usr/local/simplescalar/simplesim-2.0/tests/src/Makefile ./

Add the necessary information about your c file into the make file in order to compile it.

vi Makefilemyprog1:myprog1.c$(CC) $(CFLAGS) -o myprog1 myprog1.c

How to make a binary for SimpleScalar Compile your c code

make myprog1 Run the simulator

/usr/local/simplescalar/simplesim-2.0/sim-cache myprog1

Global Simulator Options (cont.)

Supported on all simulators -h - print simulator help message -d - enable debug message -i - start up in DLite! debugger -q - quit immediately -config <file> - read config parameters from

<file> -dumpconfig <file> - save config parameters into

<file>

Cache Simulation Options -cache:dl1 <config> l1 data cache -cache:dl2 < config > l2 data cache -cache:il1 < config > l1 inst cache -cache:il2 < config > l2 inst cache -tlb:itlb < config > instruction

TLB -tlb:dtlb < config > data TLB

sim-cache

sim-cache …(cont.)

The cache size is therefore the product of, <nsets>, <bsize>, <assoc>. il1:256:32:1:1 (8KB)

sim-cache …(cont.)

Example myprog1.c

#define N 1024main(){

int i,j,x[N][N];for(i=0;i<N;i++)

for(j=0;j<N;j++) x[i][j]=2*x[i][j];

}

Example (cont’d) adding below ones into the Makefile

myprog1:myprog1.c$(CC) $(CFLAGS) -o myprog1 myprog1.c

Compile myprog1.c make myprog1

Run the simulator with sim-cache defaults /usr/local/simplescalar/simplesim-2.0/sim-

cache myprog1

Example (cont’d) Collect the output

il1.misses 381 # total number of misses il1.miss_rate 0.0001 # miss rate (i.e.,

misses/ref) dl1.misses 131512 # total number of

misses dl1.miss_rate 0.0626 # miss rate (i.e.,

misses/ref) ul2.misses 65933 # total number of

misses ul2.miss_rate 0.2506 # miss rate (i.e.,

misses/ref)

Example (cont’d)

Run the binary for the following cache system unified cache with 256 sets x 32 bytes

per block /usr/local/simplescalar/simplesim-2.0/sim-

cache -cache:il1 dl1 -cache:dl1 ul1:256:32:1:l -cache:dl2 none -cache:il2 none myprog1

Collect the results Comment on the results

More Information

http://www.simplescalar.com