#9310: sage-4.4.4.alpha1 build issue -- random doctest failure on menas (skynet)
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Reporter: was | Owner: mvngu
Type: defect | Status: new
Priority: critical | Milestone: sage-4.6.2
Component: doctest | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by vbraun):
I did run the test 1000x with -randorder, and found a couple of doctests
that depend on the execution order. Since we always initialize GAP's
random number generator it is very likely that the output of these
operations depends on the order of memory locations. Presumably this
causes the doctest failure on some architectures even without -randorder.
The problems are in
* `module_composition_factors`
* `as_permutation_group`
* `random_element`
The first two use `MeatAxe`. I think that `random_element` enumerates all
group elements and then picks a random one. We do control the random
numbers, but enumerating uses the coset enumerator and presumably depends
on memory locations.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9310#comment:11>
Sage <http://www.sagemath.org>
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