Be explicit with unified memory compilation to stay robust in changes of defaults

Author: ntselepidis

CMakeLists.txt

@@ -498,11 +498,11 @@ function(MFC_SETUP_TARGET)
                 # GH-200 Unified Memory Support
                 if (MFC_Unified)
                     target_compile_options(${ARGS_TARGET}
-                        PRIVATE -gpu=mem:unified -cuda
+                        PRIVATE -gpu=mem:unified:managedalloc -cuda
                     )
                     # "This option must appear in both the compile and link lines" -- NVHPC Docs
                     target_link_options(${ARGS_TARGET}
-                        PRIVATE -gpu=mem:unified -cuda
+                        PRIVATE -gpu=mem:unified:managedalloc -cuda
                     )
                 endif()
 

toolchain/templates/santis.mako

@@ -27,7 +27,7 @@
 % endif
 
 # NVHPC and CUDA env vars
-export NV_ACC_USE_MALLOC=0                    # use cudaMallocManaged instead of malloc ( compiled using -gpu=mem:unified )
+export NV_ACC_USE_MALLOC=0                    # use cudaMallocManaged instead of malloc ( compiled using -gpu=mem:unified:managedalloc )
 export NVCOMPILER_ACC_NO_MEMHINTS=1           # disable implicit compiler hints
 #export CUDA_BUFFER_PAGE_IN_THRESHOLD_MS=0.001 # workaround for copying to/from unpopulated buffers on GH