Updated README.md with GPU notes and commented out WIP on zbook

Author: jajhall

src/pdlp/CupdlpWrapper.cpp

@@ -73,8 +73,18 @@ HighsStatus solveLpCupdlp(const HighsOptions& options, HighsTimer& timer,
   void* presolvedmodel = NULL;
   void* model2solve = NULL;
 
+  // WIP on zbook?
+  //
+  //  HighsInt size_of_CUPDLPscaling = sizeof(CUPDLPscaling);
+  //
   CUPDLPscaling* scaling = (CUPDLPscaling*)cupdlp_malloc(sizeof(CUPDLPscaling));
 
+  // WIP on zbook?
+  //
+  //  printf("size_of_CUPDLPscaling = %d\n", size_of_CUPDLPscaling);
+  //  scaling->ifRuizScaling = 1;
+  //  printf("scaling->ifRuizScaling = %d\n", scaling->ifRuizScaling);
+
   // claim solvers variables
   // prepare pointers
   CUPDLP_MATRIX_FORMAT src_matrix_format = CSC;

src/pdlp/cupdlp/README.md

@@ -101,7 +101,21 @@ The `cuPDLP-c` iteration count is held in `pdhg->timers->nIter`, but `pdhg` is d
 
 - Make CupldlpWrapper.cpp look more like C++ than C
 
-
-
-
-
++## Using a GPU
++
++### Install CUDA
++
++* sudo apt update && sudo apt upgrade
++* sudo apt autoremove nvidia* --purge
++* sudo apt update && sudo apt upgrade
++* nvcc --version
++* sudo apt install nvidia-cuda-toolkit
++
++### Building PDLP
++
++export HIGHS_HOME=/home/jajhall/install
++export CUDA_HOME=/usr/lib/cuda
++
++
++
++