bugGNU Octave - Bugs: bug #37742, sqp test failure with ATLAS on...

 
 

bug #37742: sqp test failure with ATLAS on Debian amd64

Submitted by:  Mike Miller <mtmiller>
Submitted on:  Thu 15 Nov 2012 03:42:16 AM UTC  
 
Category: LibrariesSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Incorrect Result
Status: FixedAssigned to: Mike Miller <mtmiller>
Originator Name: Open/Closed: Closed
Release: devOperating System: GNU/Linux

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Sat 08 Dec 2012 11:21:20 PM UTC, comment #1:

Fixed by increasing the tolerance on the failing test. This same test tolerance had already been increased a few times over the years.

http://hg.savannah.gnu.org/hgweb/octave/rev/534a2c881f45

Mike Miller <mtmiller>
Project MemberIn charge of this item.
Thu 15 Nov 2012 03:42:16 AM UTC, original submission:

I'm not using sqp, but I have been getting a consistent failure when running make check, affects both stable and default branches for me. Error is slightly over the tolerance specified in the test case.

The gotcha is it only fails when libblas.so.3 is configured to point to ATLAS, and only on Debian 64-bit (testing or unstable). This is the Debian libatlas3-base package, not a self-compiled ATLAS.

This could conceivably be a bug with the atlas library in Debian, but the result of the test as shown below is so close and the tolerance of 5*sqrt(eps) looks arbitrary to me, I think this could be resolved by bumping up the tolerance here.

Mike Miller <mtmiller>
Project MemberIn charge of this item.

 

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    Follow 3 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Sat 08 Dec 2012 11:21:20 PM UTCmtmillerStatusNone=>Fixed
      Assigned toNone=>mtmiller
      Open/ClosedOpen=>Closed

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