Package: libscotchmetis-dev
Severity: wishlist

Greetings,

This is a good drop-in replacement for non-free metis for many purposes,
but it is incomplete.  Please add the functions METIS_PartMeshDual and
METIS_PartMeshNodal.

Thank you,
-Adam

I am missing the following functions in order to use libscotchmetis-dev
in FreeFOAM: METIS_WPartGraphRecursive, METIS_WPartGraphKway.

Thanks,
Gerber van der Graaf

The following functions are missing for the package gmsh:
METIS_mCPartGraphKway METIS_mCPartGraphRecursive

It would be good to have it in libscotchmetis-dev.

Thanks,

Anton

From [1] this feature won't probably never be added to scotchmetis.

[1] https://gforge.inria.fr/forum/message.php?msg_id=104489&group_id=248

Checking the status of this bug, METIS_PartMesh* is still absent from
SCOTCH_Metis.

As far as METIS_WPartGraphKway and METIS_mCPartGraphKway go,
these functions do not exist in metis 5.1.0. There is only
METIS_PartGraphKway and METIS_PartGraphRecursive, which are already
supported in SCOTCH.

I can see METIS_WPartGraphKway in old metis 3.0.6 source,
and I can see METIS_mCPartGraphKway in metis 4.0.3, but neither are
present in metis 5.1.0.

It is my intention after the bullseye release to start configuring
SCOTCH with SCOTCH_METIS_VERSION=5 (Bug#989783), to better match our
version of libmetis-dev.

In regards to METIS_WPartGraphRecursive, METIS_WPartGraphKway in
FreeFoam, these were dropped when FreeFOAM rebranded as OpenFOAM,
which uses only METIS_PartGraphRecursive, METIS_PartGraphKway.

ie. Metis v5 compatibility is suitable for OpenFOAM (which also does
not use METIS_PartMesh* )

More precisely, FreeFOAM was a fork of OpenFOAM, now abandoned, which
aimed to provide a cmake build system instead of wmake. FreeFOAM never
pulled the OpenFOAM patches that removed the use of Metis v3 API.

Hi Anton, chasing up Scotch Metis compatibility, do you see any more
use at this point in time for METIS_mCPartGraphKway and
METIS_mCPartGraphRecursive ?

If I read the Metis history correctly, these functions appeared in
Metis v4 but were not in Metis v3, and have been removed again in
Metis v5.

Metis v5 seems to have simplified the API, there's only
METIS_PartGraphKway and METIS_PartGraphRecursive.

I imagine it's simpler for Scotch if they only need to provide
Metis v5 compatibility.

METIS_PartMeshDual was added in v6.1.1

METIS_PartMeshNodal is expected to be added soon,
see https://gitlab.inria.fr/scotch/scotch/-/issues/11
(didn't make it into v6.1.2, but more releases are expected soon)

We believe that the bug you reported is fixed in the latest version of
scotch, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 506033@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Drew Parsons <dparsons@debian.org> (supplier of updated scotch package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 01 Sep 2025 04:30:32 +0200
Source: scotch
Architecture: source
Version: 7.0.9-1exp1
Distribution: experimental
Urgency: medium
Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
Changed-By: Drew Parsons <dparsons@debian.org>
Closes: 506033 1110401
Changes:
 scotch (7.0.9-1exp1) experimental; urgency=medium
 .
   * New upstream release.
     - supports dual graphs in parallel.
       Provides ParMETIS_V3_Mesh2Dual. Closes: #506033.
     - deprecates debian patch parallel_tests.patch
     - applies install_missing_exe.patch
   * libscotch-dev Depends: libscotcherr-dev. Likewise libptscotch-dev.
   * libscotcherr-dev Breaks, Replaces: libscotch-dev (<< 7.0.8-1~)
     Likewise for libptscotcherr-dev. Closes: #1110401.
   * update debian patches
     - update standalone_tests.patch for gdump
     - add install_exe_in_bin.patch installs adm2dgr* (executable
       for ptscotch/parmetis) to bin not lib
     - add revert_internal_headers_in_tests_81cb036f.diff to revert
       commit 81cb036f (4/7/2025), which included internal headers in
       tests preventing them from building standalone.
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Checksums-Sha256:
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Oops, closed the wrong bug sorry!