Output-Model-and-Configuration-Parameters.md

+The output model consists of different configuration files depending on the used packages.
+
+- Overall reference of the architecture https://mitgcm.readthedocs.io/en/latest/software_arch/software_arch.html
+
+## model/inc/SIZE.h
+
+The memory layout is grid based. Where the grid is split up in tiles to be able to parallelize the execution.
+
+- sNx and sNy model grid size for one tile
+- OLx and OLy are the extend of the overlay OLx and OLy (usual 4 points) in that case OLx = 4 and OLy = 4. Larger sizes reduce performance.
+- nSx and nSy specify the number of tiles for one single process
+  (Who named them so close to sNx?)
+- nPx and nPy define how many processes are used in x and y direction.
+
+The complete model gird size is then:
+```
+Nx  = sNx*nSx*nPx
+Ny  = sNy*nSy*nPy
+```
+
+## input/eedata
+
+This file may hold additional parameters for configuration. So far:
+- nTx and nTy which define how many threads can be used per process
+  - nTx * nTy = the number of threads spawned, i.e., the PARALLEL environment variable.
+  - nTx must subdivide the number of sub-domains in x (nSx) exactly. (constraint)
+  - nTy must subdivide the number of sub-domains in y (nSy) exactly. (constraint)
+
+## Overall Configuration
+
+https://mitgcm.readthedocs.io/en/latest/software_arch/software_arch.html#annotated-call-tree-for-mitgcm-and-wrapper