RestartFileFormatStates
RestartFileFormatStates
Section Execution::IO
Type integer
File format used for writing and reading the restart files for the states.
Default is adios2 if support is available, otherwise obf.
Restart files for linear response calculations always use obf.
Options:
- obf:
obf is the Octopus binary format, for which there is one file for
each state.
- adios2:
For large systems, especially with many k points, having one file per state can
be problematic for the file system. This option selects a format based on the
ADIOS2 library which needs to be available. The library handles IO efficiently
including aggregation and makes the restart IO much faster. However, it does
not support all features that the default obf format supports. Moreover, it
might use more memory for internal aggregation. In case of out-of-memory issues,
you might need to rerun on more nodes.