I also get the error in get_memory_usage, mostly on OSX. Definitely a 
flakey test!

On Tuesday, August 10, 2021 at 4:57:49 AM UTC+2 Samuel Lelievre wrote:

> Volker Braun:
> >
> > e0cbf2c965 (tag: 9.4.rc1, trac/develop) Updated SageMath version to 
> 9.4.rc1
> > 952f7f9006 Trac #31565: Build still non-portable despite 
> SAGE_FAT_BINARY=yes because of numpy
> > 5090d3dab1 Trac #32322: Random failure in projective_ds.py
> > a73ad2437f Trac #32142: Implement the alternating central extension of 
> the Onsager Lie algebra
> > d81cacb611 Trac #32006: Fix links in tutorial bibliography
> > bd073b49ba (tag: 9.4.rc0) Updated SageMath version to 9.4.rc0
>
> Thanks for this new release!
> I hope the last two positively reviewed
> "critical" tickets can make it in Sage 9.4.
>
> On macOS 10.14.6 "Mojave", with lots of homebrew packages,
> upgrading to Sage 9.4.rc1 from a working 9.4.rc0:
>
> ```
> $ source .homebrew-build-env
> $ ./bootstrap -q
> $ ./configure -q
> configure: WARNING: ".../build/pkgs/backports_ssl_match_hostname/type"
> is missing. Leftovers from another branch?
> $ make -s V=0
> ...
> Sage build/upgrade complete!
> ```
>
> ```
> $ make -s V=0 ptestlong
> ...
> ----------------------------------------------------------------------
> sage -t --long --warn-long 145.3 --random-seed=0
> src/sage/geometry/polyhedron/base.py # 1 doctest failed
> ----------------------------------------------------------------------
> Total time for all tests: 8335.9 seconds
> cpu time: 25308.4 seconds
> cumulative wall time: 32261.4 seconds
> Pytest is not installed, skip checking tests that rely on it.
> make: *** [ptestlong] Error 1
>
> $ ./sage -t --long --warn-long 145.3 --random-seed=0
> src/sage/geometry/polyhedron/base.py
> Running doctests with ID 2021-08-10-04-23-28-4a95405e.
> Git branch: develop
> Using --optional=build,dochtml,homebrew,pip,sage,sage_spkg
> Doctesting 1 file.
> sage -t --long --warn-long 145.3 --random-seed=0
> src/sage/geometry/polyhedron/base.py
> **********************************************************************
> File "src/sage/geometry/polyhedron/base.py", line 6653, in
> sage.geometry.polyhedron.base.Polyhedron_base.face_lattice
> Failed example:
> n == get_memory_usage()
> Expected:
> True
> Got:
> False
> **********************************************************************
> 1 item had failures:
> 1 of 42 in sage.geometry.polyhedron.base.Polyhedron_base.face_lattice
> [1758 tests, 1 failure, 98.31 s]
> ----------------------------------------------------------------------
> sage -t --long --warn-long 145.3 --random-seed=0
> src/sage/geometry/polyhedron/base.py # 1 doctest failed
> ----------------------------------------------------------------------
> Total time for all tests: 98.7 seconds
> cpu time: 54.0 seconds
> cumulative wall time: 98.3 seconds
> Pytest is not installed, skip checking tests that rely on it.
> ```
>
> Maybe related to
> https://trac.sagemath.org/ticket/31623
>

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