Don't explicitly map MPI rank to GPU

Author: awnawab

README.md

@@ -241,8 +241,6 @@ Running
 -------
 No extra run-time options are needed to run the GPU enabled ecWam. Please note that this means that if ecWam is built
 using the `--with-loki` and `--with-acc` bundle arguments, it will necessarily be offloaded for GPU execution.
-For multi-GPU runs, the number of GPUs maps to the number of MPI ranks. Thus multiple GPUs can be requested by
-launching with multiple MPI ranks. The mapping of MPI ranks to GPUs assumes at most 4 GPUs per host node.
 
 Environment variables
 ---------------------

src/ecwam/CMakeLists.txt

@@ -269,7 +269,6 @@ list( APPEND ecwam_srcs
   w_mode_st.F90
   w_pdf.F90
   w_pmax.F90
-  wam_init_gpu_mod.F90
   wam_multio_mod.F90
   wam_nproma.F90
   wam_sorti.F90

src/ecwam/wam_init_gpu_mod.F90

@@ -89,10 +89,6 @@ SUBROUTINE WVWAMINIT (LLCOUPLED, IULOG, LLRNL,                    &
       IRANK = MPL_MYRANK()
       NPROC = MPL_NPROC()
 
-#if defined(WAM_GPU)
-      CALL WAM_INIT_GPU(IRANK)
-#endif
-
 !     STANDARD OUTPUT UNIT
 !     --------------------