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From sebb <seb...@gmail.com>
Subject Re: [MATH] Jenkins unit test failure
Date Sat, 10 Jan 2015 00:32:08 GMT
On 9 January 2015 at 23:48, sebb <sebbaz@gmail.com> wrote:
> Of the last 6 runs, only 1 had a problem with unit test failures.
>
> All the builds ran on ubuntu3, apart from the failure which ran on H10.
> This may have some bearing on the result; I don't yet know.
>
> I had a quick look at 2 tests that failed:
>
> SimpleRegressionTest.testPerfect
>
> SimpleRegressionTest.testPerfectNegative
>
> Although the test case has some instance data, these particular tests
> do not use any, so it does not look like a concurrency issue in the
> unit test itself.
>
> The SimpleRegression class has mutable instance data, but the test
> cases create their own instance.
>
> I don't know anything about the math functions involved, but it looks
> as though Infinity might result from getSignificance() if
> getSlopeStdErr() returns 0, as the latter is used as a divisor. Or if
> the field sumXX is 0 because that is also used as a divisor.
>
> Maybe the H10 host has different floating point hardware?
>
> I'll try running some more tests on H10.

the build failed again on H10; exactly the same tests failed as before:

This test:
https://builds.apache.org/job/Commons%20Math%20H10/1/console

Previous failure:
https://builds.apache.org/job/Commons%20Math/14/console

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