Vortex GPGPU

Vortex is a full-stack open-source RISC-V GPGPU.

Specifications

• Support RISC-V RV32IMAF and RV64IMAFD
• Microarchitecture:
  • configurable number of cores, warps, and threads.
  • configurable number of ALU, FPU, LSU, and SFU units per core.
  • configurable pipeline issue width.
  • optional local memory, L1, L2, and L3 caches.
• Software:
  • OpenCL 1.2 Support.
• Supported FPGAs:
  • Altera Arria 10
  • Altera Stratix 10
  • Xilinx Alveo U50, U250, U280
  • Xilinx Versal VCK5000

Directory structure

• doc: Documentation.
• hw: Hardware sources.
• driver: Host drivers repository.
• runtime: Kernel Runtime software.
• sim: Simulators repository.
• tests: Tests repository.
• ci: Continuous integration scripts.
• miscs: Miscellaneous resources.

Build Instructions

More detailed build instructions can be found here.

Supported OS Platforms

• Ubuntu 18.04, 20.04
• Centos 7

Toolchain Dependencies

• POCL
• LLVM
• RISCV-GNU-TOOLCHAIN
• Verilator
• FpNew
• SoftFloat
• Ramulator
• Yosys
• Sv2v

Install development tools

$ sudo apt-get install build-essential
$ sudo apt-get install binutils
$ sudo apt-get install python
$ sudo apt-get install uuid-dev
$ sudo apt-get install git

Install Vortex codebase

$ git clone --depth=1 --recursive https://github.com/vortexgpgpu/vortex.git
$ cd Vortex

Configure your build folder

# By default, the toolchain default install location is the /opt folder and can be overridden by setting --tooldir.
$ mkdir build
$ cd build
$ ../configure --xlen=32 --tooldir=$HOME/tools

Install prebuilt toolchain

$ ./ci/toolchain_install.sh --all

set environment variables

# should always run before using the toolchain!
$ source ./ci/toolchain_env.sh

Building Vortex

$ make -s

Quick demo running vecadd OpenCL kernel on 2 cores

$ ./ci/blackbox.sh --cores=2 --app=vecadd

Common Developer Tips

• Installing Vortex kernel and runtime libraries to use with external tools requires passing --prefix= to the configure script.

  $ ../configure --xlen=32 --tooldir=$HOME/tools --prefix=<install-path>
  $ make -s
  $ make install
  

• Building Vortex 64-bit simply requires using --xlen=64 configure option.

  $ ../configure --xlen=32 --tooldir=$HOME/tools
  

• Sourcing "./ci/toolchain_env.sh" is required everytime you start a new terminal. we recommend adding "source /ci/toolchain_env.sh" to your ~/.bashrc file to automate the process at login.

  $ echo "source <build-path>/ci/toolchain_env.sh" >> ~/.bashrc
  

• Making changes to Makefiles in your source tree or adding new folders will require executing the "configure" script again to get it propagated into your build folder.

  $ ../configure
  

• To debug the GPU, you can generate a "run.log" trace. see /docs/debugging.md for more information.

  $ ./ci/blackbox.sh --app=demo --debug=3
  

• For additional information, check out the /docs.