Quirks

A collection of problems or unexpected behaviour. Pure bugs in DALES should be filed as github issues instead.

Crash with OpenMPI 3.1.1

On Lisa, runs with 16 cores on one node frequently crashed when compiled with the foss/2018b module set. This seems to be a bug in OpenMPI. With OpenMPI 3.1.3 the problem disappeared. The crash usually happened in transpose_b or transpose_binv in modpois. Such a bug is mentioned in the OpenMP release notes, and this bug report.

Cray MPI and system() commands

Cray MPI is by default not compatible with programs that launch other programs with system(). In Dales, at least some versions, system() is used to symlink init*latest files to the appropriate init* file. This caused crashes. A possible workaround is to call a function for creating the symlink, this is annoying because the syntax and support for this differs between Fortran compilers.

Wrong wallclock time measurement

Some OpenMPI versions report an incorrect wallclock time - not taking CPU frequency variations into account.

ifort: command line remark #10148: option '-i_dynamic' not supported

Cmake before version 3.0 is not compatible with the Intel Fortran compiler - it adds an obsolete flag -i_dynamic. Using a newer cmake solves this issue.