*Here is a [http://hpc.fs.uni-lj.si/sites/default/files/HPC_for_dummies.pdf gentle introduction to HPC] for myself (and whoever might benefit from it), even though this was published in 2009 and by AMD (hence it is less likely to have recent information on GPU computing).
*This recent paper [https://www.researchgate.net/publication/308967833_GPU_Computing_Applied_to_Linear_and_Mixed_Integer_Programming GPU Computing Applied to Linear and Mixed Integer Programming] should be helpful. It summarizes recent advancement in GPU computing in the OR community.
2018-07-03 <br>
Finally learned from Chenyu that the "bug" reported on June 21 was not a bug at all. We are getting singular matrices because we are using too small R and monte_M.