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PiMsimulation
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PiM simulation with Gem5 & Ramulator
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PiMsimulation
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# PiMsimulation PiM simulation with Gem5 & Ramulator ## Introduction This repository is for simulating PiM using Gem5 -the process simulator- and Ramulator -the memory simulator. PiM model simulated in this repository is quite simple. It receives the address, and increases the value stored in the given address by 1. ## Environment * **Server environment**: Ubuntu 20.04 * **Simulated CPU architecture**: RISCV * **Simulated Memory**: DDR4 ## Directory / File info  Figure: Control & Data flow while simlating PiM using Gem5 & Ramulator ### Ramulator * **Main.cpp:** Receive parameter in ramulator runtime & execute `get_dramtrace_request` (Processor.cpp) * **Processor.cpp:** determine the type of request (read / write / pim) * **Memory.h / Controller.h:** execute `memory.tick()` * **DDR4.h:** you can adjust the variable `nPim` here - `nPim`: Clocks taken for executing pim calculation. ### Gem5 * **src/arch/riscv/isa/** - **decoder.isa:** decode instruction and generate request - **mem.isa:** definition for generating and operating request * **src/cpu/** - **simple/atomic.hh:** definition for function of simple atomic CPU - **simple/timing.cc:** definition for function of simple timing CPU (definition for `pimMem`) * **src/mem/** - **abstract_memory.cc:** abstraction layer for memory models - **ramulator.cc:** modified lines in `recvTimingReq` in order to send PIM type request * **progs/** - **mem_test.c, pim_test.c, nop_test.c:** test files ### Cross compiler * **xcompiler/riscv-opcodes/:** allocating match and mask bits for custom instruction * **xcompiler/riscv-gnu-toolchain/:** modify compiler and build it ## Build ``` # Solve gem5 & ramulator Dependency sudo apt install build-essential git m4 scons zlib1g zlib1g-dev \ libprotobuf-dev protobuf-compiler libprotoc-dev libgoogle-perftools-dev \ python3-dev python-is-python3 libboost-all-dev pkg-config # Solve cross compiler Dependency sudo apt-get install autoconf automake autotools-dev curl python3 libmpc-dev \ libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc \ zlib1g-dev libexpat-dev device-tree-compiler # Build PiM Simulator git clone https://github.com/RohSiHyun/PiMsimulation.git cd PiMsimulation/gem5 scons build/RISCV/gem5.opt -j 32 # Build Cross compiler cd ../xcompiler cd riscv-gnu-toolchain ./configure --prefix={absolute path for installing cross compiler} make -j 32 # Execute simulation ./run.sh # You can see more details by looking into run.sh # run.sh builds debug_pim and debug_mem files and you can see the simulation results ``` ## Error Handling If build fails with message "**config/have_deprecated_namespace.hh: No such file or directory**", please modify `gem5/src/base/compiler.hh` > 1. delete line 46 (#include "config/have_deprecated_namespace.hh") > 2. add new line (#define HAVE_DEPRECATED_NAMESPACE 1) **This version is uploaded on `NSsolution` branch**
