[redbullah]

Hi all,
To use metis, I downloaded the metis-5.1.0 version here, but not sure if this is a compatible version and how to install it. Is there a procedure to install it with full compatibility within OF-5.x?
Thanks in advance

[olesen]

I've used http://glaros.dtc.umn.edu/gkhome/fet...s-5.1.0.tar.gz with OpenFOAM-1712 and 1806. There is amakeMETIS ThirdParty script, a wmake `have_metis` detection/selection script and of course a corresponding etc/config.sh/metis file.


I did some testing comparisons between metis, scotch and kahip, trying to push them to produce bad decompositions. Eg, take the motorBike tutorial and try to decompose on a silly number of processors (512, 1024, 2048, ...). As quality metrics I then looked at the number of processor neighbours and the number of neighbour faces. For a wide range they performed quick similarly, but scotch did produce some odd decompositions too (ie, suddenly the worst processor had 65 neighbours and the rest had 30 or so). Didn't observe this for metis or kahip.


Nonetheless, one argument for scotch could be pt-scotch if you have large meshes. Otherwise you run into the problem that the indices for the adjacency lists overflow. In that case, it could also be reasonable to use a multi-level decomposition with hierarchical for the first level and metis for the subsequent levels.

[wyldckat]

Originally Posted by redbullah

To use metis, I downloaded the metis-5.1.0 version here, but not sure if this is a compatible version and how to install it. Is there a procedure to install it with full compatibility within OF-5.x?

Quick answer:

1. Unpack the "metis-5.1.0" package inside the "ThirdParty-5.x" folder.
2. Make sure that the unpacked folder is named "metis-5.1.0" and that is does not contain only one folder inside that one (i.e. it didn't unpack into "metis-5.1.0/metis-5.1.0").
3. Run the Allwmake script in the "OpenFOAM-5.x" folder and it should automatically build Metis along with the libraries and applications that use it.

I know this because:

1. It's pre-configured in this file: https://github.com/OpenFOAM/OpenFOAM...onfig.sh/metis
2. The Allwmake script in the "ThirdParty-5.x" folder is already configured to do the trick on its own: https://github.com/OpenFOAM/ThirdPar.../Allwmake#L312

The same should work with OpenFOAM 6 and OpenFOAM-dev.