Merge pull request #131 from ajnonaka/update_sundials_readme

Update README to sundials install v.7.1.1

ExampleCodes/SUNDIALS/Exec/README_sundials

@@ -3,13 +3,19 @@ https://computing.llnl.gov/projects/sundials/faq#inst
 
 Installation
 
-# Download sundials-x.y.z.tar.gz file for SUNDIALS and extract it at the same level as amrex.
-# Update 6/11/24 - v7.0.0. tested
-https://computing.llnl.gov/projects/sundials/sundials-software
-
+# You need SUNDIALS v7.1.1 or later.
+# Check https://computing.llnl.gov/projects/sundials/sundials-software to see if it's available for download.
+# If so, download sundials-x.y.z.tar.gz and extract it at the same level as amrex using
 >> tar -xzvf sundials-x.y.z.tar.gz # where x.y.z is the version of sundials
+>> mv sundials-x.y.z sundials-src
+
+# If v7.1.1. is not available on the website, clone the git repo directly and use the latest version
+# At the same level that amrex is cloned, do:
+
+>> git clone https://github.com/LLNL/sundials.git
+>> mv sundials sundials-src
 
-# at the same level that amrex is cloned, do:
+# Next
 
 >> mkdir sundials
 >> cd sundials
@@ -22,7 +28,7 @@ HOST BUILD
 >> mkdir builddir
 >> cd builddir
 
->> cmake -DCMAKE_INSTALL_PREFIX=/pathto/sundials/instdir -DEXAMPLES_INSTALL_PATH=/pathto/sundials/instdir/examples -DENABLE_MPI=ON ../../sundials-x.y.z
+>> cmake -DCMAKE_INSTALL_PREFIX=/pathto/sundials/instdir -DEXAMPLES_INSTALL_PATH=/pathto/sundials/instdir/examples -DENABLE_MPI=ON ../../sundials-src
 
 ######################
 NVIDIA/CUDA BUILD
@@ -34,7 +40,7 @@ NVIDIA/CUDA BUILD
 >> mkdir builddir_cuda
 >> cd builddir_cuda
 
->> cmake -DCMAKE_INSTALL_PREFIX=/pathto/sundials/instdir_cuda -DEXAMPLES_INSTALL_PATH=/pathto/sundials/instdir_cuda/examples -DENABLE_CUDA=ON -DENABLE_MPI=ON ../../sundials-x.y.z
+>> cmake -DCMAKE_INSTALL_PREFIX=/pathto/sundials/instdir_cuda -DEXAMPLES_INSTALL_PATH=/pathto/sundials/instdir_cuda/examples -DENABLE_CUDA=ON -DENABLE_MPI=ON ../../sundials-src
 
 ######################
 
@@ -55,31 +61,4 @@ NVIDIA/CUDA BUILD
 
 >> make -j4 # optional to have 'USE_CUDA=TRUE' as well
 
-# in your inputs file, you will need to have:
-
-# INTEGRATION
-## integration.type can take on the following values:
-## 0 or "ForwardEuler" => Native AMReX Forward Euler integrator
-## 1 or "RungeKutta"   => Native AMReX Explicit Runge Kutta controlled by integration.rk.type
-## 2 or "SUNDIALS"     => SUNDIALS backend controlled by integration.sundials.strategy
-integration.type = <pick a value>
-
-## Native AMReX Explicit Runge-Kutta parameters
-#
-## integration.rk.type can take the following values:
-### 0 = User-specified Butcher Tableau
-### 1 = Forward Euler
-### 2 = Trapezoid Method
-### 3 = SSPRK3 Method
-### 4 = RK4 Method
-integration.rk.type = 3
-
-## If using the SUNDIALS Submodule, then
-## compile with USE_SUNDIALS=TRUE or AMReX_SUNDIALS=ON and
-## set strategy here:
-#
-## integration.sundials.strategy can take the following values:
-### ERK     = ERKStep from ARKode with SSPRK3 Method
-### MRI     = MRIStep from ARKode with Explict Trapezoid Method
-### MRITEST = MRIStep from ARKode modified to use no-op inner f0
-integration.sundials.strategy = ERK
+# Refer to inputs to see how to enable different integrators