I am attempting to decompose a very large mesh (22M nodes) to run on 768 cores, but consistently receive a fortran segmentation fault. When run with "–debug-enabled” configured, I receive the message:
“At line 116 of file src/decompose_mesh/part_decompose_mesh.F90
Fortran runtime error: Index ‘-2088155680’ of dimension 1 of array ‘adjncy’ below lower bound of 0”
From what I gather, this occurs when decompose-mesh is checking which elements are neighbors. I figured the error was related to a memory issue, so I reconfigured using the “-mcmodel=medium” flag, but I am still receiving the same error.
Has anyone encountered this error before, or do you know how to avoid it? For reference, I compiled using gcc version 7.1.0.