Explore Abinit and around
- ABINIT Coding
- Doc for new developers
- Organizing events
Something going wrong ? Better to realize this than to think everything is OK …
In this page, the user will find tips to fix several problems with ABINIT.
config.status: error: cannot find input file: `tests/Makefile.in'
This problem might come from the unpacking of the tar.gz. It was reported that using the Krusader file manager does not unpack correctly the tar.gz, so some files are missing. A manual unpack (tar -xvf …) should solve the problem.
configure script won't accept hostnames containing a hyphen
Also apparently an error due to incorrect unpacking of the tar.gz .
(to be filled …)
Make sure you get and read the error messages. They are usually written at the end of the log file, and look like:
--- !ERROR src_file: m_kg.F90 src_line: 179 mpi_rank: 1 message: (here follows the error message)
If you do not see such error message at the end of the log file, the error message might be found alternatively in an “error” file, depending on the command that you used to launch ABINIT. Also, if you are running in batch, the behaviour might be different, and error messages might end up in another file than the log file. If you run in parallel, the error messages might have been written in still another, separate file, entitled
If ABINIT stops quickly, consider to run in sequential, interactively (not in parallel neither in batch) to ease the understanding of what is happening.
Sometimes, the error message is prepared by another message giving preliminary information. Please, be sure to have identified the relevant information in the log file.
If you think to have obtained all information that ABINIT was supposed to give you, try to identify whether ABINIT stops because of geometry optimization problem or SCF problem. In the first case, your input geometry is perhaps crazy. Anyhow, see the next items in this troubleshooting page.
Many mistakes done by beginners are related to incorrect starting geometry.
Here is a check list :
The default ABINIT algorithm for SCF (see input variable iscf) is an excellent compromise between speed and robustness. It is referred to as Pulay II in Fig. 10 of N. D. Woods and M. C. Payne and P. J. Hasnip, J. Phys.: Condens. Matter 31, 453001 (2019), and appear on the Pareto frontier. Some parameters in the Kerker preconditioning have also an effect on the balance between speed and robustness, and the ABINIT default values are good for metallic systems. As thouroughly discussed in this reference, there is no fool-proof fast algorithm.
If your SCF cycle do not converge (see nres2 or vres2 column in the output file), the reasons can be: (1) Insufficient underlying accuracy in the solution of the Schrödinger at fixed potential (2) Transient non-linear behaviour of the SCF, due either to (2a) sudden change of occupation numbers (usually only for metals), or (2b) long-wavelength fluctuations of potential, bigger than the gap.
Start first to address (2), by some tuning which can come without significantly slowing ABINIT. Test different values of diemac. The default is very large, and suitable fo metals. Try running with a small value (perhaps 5) if your system is a bulk semiconductor or a molecule. If it is a doped solid, some intermediate value (perhaps 50) might be appropriate.
If this does not work, try to address (1), set tolrde to 0.001, increase the value of nline (e.g. 6 or 8 instead of the default 4), as well as of nnsclo (e.g. 2 instead of the default). Your residm should be significantly lower than without such modifications, and perhaps your problem will be solved.
If this still does not work, but your residm did not look bad after all before addressing (1), then revert back to the default values of tolrde, nline an nnsclo, as this indeed slows down ABINIT.
Then, try to use iscf 2. This is a very slow but inconditionally convergent algorithm provided diemix is small enough. At some stage of convergence, you might restart with the obtained _DEN a better algorithm, as non-linear effects should have been eliminated at some stage.
(to be filled)
(to be filled)