Hmmm... On Debian testing running on corei7+16GB RAM, I get three hiccups :

----------------------------------------------------------------------
sage -t --long --warn-long 98.4 src/sage/misc/trace.py  # 1 doctest failed
sage -t --long --warn-long 98.4 src/sage/homology/simplicial_complex.py  # 
1 doctest failed
sage -t --long --warn-long 98.4 src/sage/tests/book_stein_modform.py  # Bad 
exit: 2
----------------------------------------------------------------------
Total time for all tests: 3248.8 seconds
    cpu time: 16373.7 seconds
    cumulative wall time: 22543.6 seconds
Makefile:112 : la recette pour la cible « ptestlong » a échouée
make: *** [ptestlong] Erreur 9

real    56m44.364s
user    355m25.836s
sys    15m51.140s

However, each of them passes standalone :

charpent@asus16-ec:/usr/local/sage-7$ sage -t --long --warn-long 98.4 
src/sage/misc/trace.py 
Running doctests with ID 2016-08-19-22-33-13-85dc556b.
Git branch: develop
Using --optional=database_gap,mpir,python2,sage,sage_mode
Doctesting 1 file.
sage -t --long --warn-long 98.4 src/sage/misc/trace.py
    [9 tests, 1.88 s]
----------------------------------------------------------------------
All tests passed!
----------------------------------------------------------------------
Total time for all tests: 1.9 seconds
    cpu time: 0.2 seconds
    cumulative wall time: 1.9 seconds
charpent@asus16-ec:/usr/local/sage-7$ sage -t --long --warn-long 98.4 
src/sage/homology/simplicial_complex.py  
Running doctests with ID 2016-08-19-22-33-30-9810628f.
Git branch: develop
Using --optional=database_gap,mpir,python2,sage,sage_mode
Doctesting 1 file.
sage -t --long --warn-long 98.4 src/sage/homology/simplicial_complex.py
    [588 tests, 6.59 s]
----------------------------------------------------------------------
All tests passed!
----------------------------------------------------------------------
Total time for all tests: 6.7 seconds
    cpu time: 3.1 seconds
    cumulative wall time: 6.6 seconds
charpent@asus16-ec:/usr/local/sage-7$ sage -t --long --warn-long 98.4 
src/sage/tests/book_stein_modform.py
Running doctests with ID 2016-08-19-22-33-55-424feb52.
Git branch: develop
Using --optional=database_gap,mpir,python2,sage,sage_mode
Doctesting 1 file.
sage -t --long --warn-long 98.4 src/sage/tests/book_stein_modform.py
    [240 tests, 1.47 s]
----------------------------------------------------------------------
All tests passed!
----------------------------------------------------------------------
Total time for all tests: 1.5 seconds
    cpu time: 1.5 seconds
    cumulative wall time: 1.5 seconds

Happenstance ? Race condition ?

HTH,

--

Emmanuel Charpentier

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