Opened 4 years ago
Closed 2 years ago
#26349 closed defect (fixed)
Memory leaks with matrix operations over GF(2)
Reported by: | gh-antoine06 | Owned by: | |
---|---|---|---|
Priority: | major | Milestone: | sage-9.1 |
Component: | linear algebra | Keywords: | memory leaks |
Cc: | Merged in: | ||
Authors: | Stefan Demharter | Reviewers: | Travis Scrimshaw |
Report Upstream: | N/A | Work issues: | |
Branch: | 1af7db5 (Commits, GitHub, GitLab) | Commit: | 1af7db57ac5617c95ae274f526fcaa7e04f5b66c |
Dependencies: | Stopgaps: |
Description (last modified by )
As reported on this ask question:
n = 8 X = zero_vector(GF(2), n) M = zero_matrix(GF(2), n, n) for _ in range(10000000): Y = M * X
leads to:
m4ri_mm_malloc: malloc returned NULL --------------------------------------------------------------------------- RuntimeError Traceback (most recent call last) <ipython-input-1-04da27075a1c> in <module>() 4 5 for _ in range(Integer(10000000)): ----> 6 Y = M * X 7 /opt/sagemath/sage-source/local/lib/python2.7/site-packages/sage/structure/element.pyx in sage.structure.element.Matrix.__mul__ (build/cythonized/sage/structure/element.c:23537)() 3666 return (<Matrix>left)._matrix_times_matrix_(<Matrix>right) 3667 if BOTH_ARE_ELEMENT(cl): -> 3668 return coercion_model.bin_op(left, right, mul) 3669 3670 cdef long value /opt/sagemath/sage-source/local/lib/python2.7/site-packages/sage/structure/coerce.pyx in sage.structure.coerce.CoercionModel_cache_maps.bin_op (build/cythonized/sage/structure/coerce.c:9757)() 1173 action = self.get_action(xp, yp, op, x, y) 1174 if action is not None: -> 1175 return (<Action>action)._call_(x, y) 1176 1177 try: /opt/sagemath/sage-source/local/lib/python2.7/site-packages/sage/matrix/action.pyx in sage.matrix.action.MatrixVectorAction._call_ (build/cythonized/sage/matrix/action.c:5997)() 325 else: 326 v = v.dense_vector() --> 327 return A._matrix_times_vector_(v) 328 329 /opt/sagemath/sage-source/local/lib/python2.7/site-packages/sage/matrix/matrix_mod2_dense.pyx in sage.matrix.matrix_mod2_dense.Matrix_mod2_dense._matrix_times_vector_ (build/cythonized/sage/matrix/matrix_mod2_dense.c:6487)() 573 return VS.zero() 574 cdef Vector_mod2_dense c = Vector_mod2_dense.__new__(Vector_mod2_dense) --> 575 sig_str("matrix allocation failed") 576 c._init(self._nrows, VS) 577 c._entries = mzd_init(1, self._nrows) RuntimeError: matrix allocation failed
Change History (11)
comment:1 Changed 4 years ago by
- Description modified (diff)
comment:2 Changed 4 years ago by
comment:3 Changed 3 years ago by
- Milestone changed from sage-8.4 to sage-duplicate/invalid/wontfix
- Status changed from new to needs_review
Tested this on Sage 8.7, macOS Mojave and Ubuntu 19.04, and the problem seems to be fixed.
If someone else could confirm this on another OS (the person on ask used debian buster) then we can probably close this as wontfix.
comment:4 Changed 3 years ago by
- Reviewers set to Travis Scrimshaw
- Status changed from needs_review to positive_review
Confirmed on Ubuntu 16.04 that I am not seeing a leak.
comment:5 Changed 3 years ago by
- Milestone changed from sage-duplicate/invalid/wontfix to sage-8.8
- Status changed from positive_review to needs_work
I'm still seeing suspicious behaviour on sage 8.8.beta3 / python3, on Fedora:
If I set a vmem limit of 10 gigabyte and execute
n = 1000 X = zero_vector(GF(2), n) M = zero_matrix(GF(2), n, n) for _ in range(10000000): Y = M + M
sage still crashes for me (whereas a small number of iterations does run without problem).
comment:6 Changed 3 years ago by
- Milestone changed from sage-8.8 to sage-8.9
Tickets still needing working or clarification should be moved to the next release milestone at the soonest (please feel free to revert if you think the ticket is close to being resolved).
comment:7 Changed 3 years ago by
- Milestone changed from sage-8.9 to sage-9.1
Ticket retargeted after milestone closed
comment:8 Changed 2 years ago by
- Branch set to u/gh-sn-d/memory_leaks_with_matrix_operations_over_gf_2_
comment:9 Changed 2 years ago by
- Commit set to 1af7db57ac5617c95ae274f526fcaa7e04f5b66c
- Status changed from needs_work to needs_review
- Summary changed from Memory leaks with matrix multiplication over GF(2) to Memory leaks with matrix operations over GF(2)
comment:11 Changed 2 years ago by
- Branch changed from u/gh-sn-d/memory_leaks_with_matrix_operations_over_gf_2_ to 1af7db57ac5617c95ae274f526fcaa7e04f5b66c
- Resolution set to fixed
- Status changed from positive_review to closed
It would seem the memory management on these objects is rather fundamentally broken. Also with lines like
Y= M+M
orY=X+X
I am seeing similar leaking behaviour.