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C++ Standard Parallelism in LLVM Using OpenMP Target Offloading

This repository is a proof of concept showing that an OpenMP offloading backend for C++ standard parallelism can be implemented in llvm-project/libcxx.

Installation

To install the LLVM compiler with the patch applied, modify the source and descitnation directories in install_llvm.sh and type

$ source install_llvm.sh

Example Code

There are three examples using std::for_each(std::par_unseq,...). To compile and run them, select a file from src and compile it by specifying APP, for instace

$ mkdir bin
$ make APP=foreach_std_vector OMP=1 && bin/foreach_std_vector

Convince yourself that the program runs on the GPU with

$ LIBOMPTARGET_DEBUG=-1 ./bin/foreach_std_vector

or

$ ./bin/foreach_std_vector & watch -n 0.1 rocm-smi
========================= ROCm System Management Interface =========================
=================================== Concise Info ===================================
GPU  Temp (DieEdge)  AvgPwr  SCLK     MCLK    Fan     Perf  PwrCap  VRAM%  GPU%
0    35.0c           77.0W   1725Mhz  800Mhz  14.51%  auto  225.0W    9%   100%
1    30.0c           17.0W   930Mhz   350Mhz  14.51%  auto  225.0W    0%   0%
2    30.0c           19.0W   930Mhz   350Mhz  14.51%  auto  225.0W    0%   0%
3    31.0c           23.0W   930Mhz   350Mhz  14.51%  auto  225.0W    0%   0%
4    28.0c           21.0W   930Mhz   350Mhz  14.51%  auto  225.0W    0%   0%
5    29.0c           17.0W   930Mhz   350Mhz  14.51%  auto  225.0W    0%   0%
6    28.0c           22.0W   930Mhz   350Mhz  14.51%  auto  225.0W    0%   0%
7    28.0c           20.0W   930Mhz   350Mhz  14.51%  auto  225.0W    0%   0%
====================================================================================
=============================== End of ROCm SMI Log ================================