#24190 closed defect (fixed)
Checking for overflow in matrix_mod2_dense not working on OS X 10.12.6
Reported by:  mderickx  Owned by:  

Priority:  blocker  Milestone:  sage8.1 
Component:  linear algebra  Keywords:  
Cc:  Merged in:  
Authors:  Jeroen Demeyer  Reviewers:  Volker Braun 
Report Upstream:  N/A  Work issues:  
Branch:  145f9df (Commits)  Commit:  
Dependencies:  Stopgaps: 
Description
With OS X 10.12.6, Xcode 9.1 (and the same happens when building with clang, #12426):
sage t long warnlong 64.0 src/sage/matrix/matrix_mod2_dense.pyx # Killed due to kill signal ... ... ... sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 90 ## 0 sage: type(random_matrix(GF(2),2,2)) ## line 165 ## <type 'sage.matrix.matrix_mod2_dense.Matrix_mod2_dense'> sage: Matrix(GF(2),3,3,1) # indirect doctest ## line 168 ## [1 0 0] [0 1 0] [0 0 1] sage: matrix(GF(2),0,[]) * vector(GF(2),0,[]) ## line 177 ## () sage: MatrixSpace(GF(2), 2^30)(1) ## line 182 ##
The failing doctest was introduced at #23742
Change History (8)
comment:1 Changed 2 years ago by
comment:2 Changed 2 years ago by
It seems that OS X simply doesn't support ulimit v
.
comment:3 Changed 2 years ago by
 Branch set to u/jdemeyer/checking_for_overflow_in_matrix_mod2_dense_not_working_on_os_x_10_12_6
comment:4 Changed 2 years ago by
 Commit set to 145f9df89c261fc3667c17e13b1d24a34e78b951
 Status changed from new to needs_review
New commits:
145f9df  Skip test on systems without RLIMIT_AS support

comment:5 Changed 2 years ago by
 Reviewers set to Volker Braun
 Status changed from needs_review to positive_review
comment:6 Changed 2 years ago by
 Branch changed from u/jdemeyer/checking_for_overflow_in_matrix_mod2_dense_not_working_on_os_x_10_12_6 to 145f9df89c261fc3667c17e13b1d24a34e78b951
 Resolution set to fixed
 Status changed from positive_review to closed
comment:7 Changed 15 months ago by
 Commit 145f9df89c261fc3667c17e13b1d24a34e78b951 deleted
I think this fix was incomplete, because it does not provide a workaround for the next two tests in the example:
sage: import resource sage: if resource.RLIMIT_AS == getattr(resource, 'RLIMIT_RSS', None): ....: # Skip this test if RLIMIT_AS is not properly ....: # supported like on OS X, see Trac #24190 ....: raise RuntimeError("matrix allocation failed") ....: else: # Real test ....: MatrixSpace(GF(2), 2^30)(1) Traceback (most recent call last): ... RuntimeError: matrix allocation failed sage: MatrixSpace(GF(2), 1, 2^40).zero() Traceback (most recent call last): ... OverflowError: ... sage: MatrixSpace(GF(2), 2^40, 1).zero() Traceback (most recent call last): ... OverflowError: ...
The MatrixSpace(GF(2), 1, 2^40).zero()
and so on still happily gobble up as much memory as they can if RLIMIT_AS
was not set. See #25884 and #23979. In the latter, I dealt with the fact that setting RLIMIT_AS
doesn't work on Cygwin, but in that case it raises a ValueError
. I'm guessing, from this ticket, that on OSX the setrlimit
call doesn't raise an exception, but doesn't actually work either.
I think we need a better solution for dealing with tests on systems where setting memory limits by the test runner doesn't work properly...
comment:8 Changed 15 months ago by
I take it backthe other tests do immediately raise OverflowError
as they should. Question is then why the MatrixSpace(GF(2), 2^30)(1)
is being run at all on Cygwin. It shouldn't, and yet it seems it does...
I'm currently building this on vbraun's testing machine. In the worst case, we just have to remove the test.