[Bug-gsl] [bug #56843] Unit Tests in linalg eigen fail on non-x86 hardware due to slight accuracy differences

[Jason Furmanek]

URL:
  <https://savannah.gnu.org/bugs/?56843>

                 Summary: Unit Tests in linalg eigen fail on non-x86 hardware
due to slight accuracy differences
                 Project: GNU Scientific Library
            Submitted by: jayfurmanek
            Submitted on: Sat 31 Aug 2019 07:04:10 PM UTC
                Category: Accuracy problem
                Severity: 3 - Normal
        Operating System: Linux
                  Status: None
             Assigned to: None
             Open/Closed: Open
                 Release: 2.5
         Discussion Lock: Any

    _______________________________________________________

Details:

I'm seeing a few unit tests (as run with "make check") fail on non-x86
hardware, specifically ppc64le and aarch64.

These looks to be just slight accuracy differences and may be chalked up to
functional differences in hardware. I don't see any tolerance controls for
these tests to account for differences like these. It would be nice if there
were.

====================================
   gsl 2.5: linalg/test-suite.log
====================================

# TOTAL: 1
# PASS:  0
# SKIP:  0
# XFAIL: 0
# FAIL:  1
# XPASS: 0
# ERROR: 0

.. contents:: :depth: 2

FAIL: test
==========

FAIL: mcholesky_invert unscaled hilbert (  4,  4)[0,2]:
-2.55795384873636067e-13                        0
 (-2.55795384873636067e-13 observed vs 0 expected) [789499]





===================================
   gsl 2.5: eigen/test-suite.log
===================================

# TOTAL: 1
# PASS:  0
# SKIP:  0
# XFAIL: 0
# FAIL:  1
# XPASS: 0
# ERROR: 0

.. contents:: :depth: 2

FAIL: test
==========

FAIL: herm random, normalized(1), unsorted (0.999999999999999112 observed vs 1
expected) [117761]
FAIL: herm random, normalized(2), val/asc (0.999999999999999112 observed vs 1
expected) [117789]
FAIL: herm random, normalized(0), val/desc (0.999999999999999112 observed vs 1
expected) [117811]
FAIL: herm random, normalized(1), abs/asc (0.999999999999999112 observed vs 1
expected) [117836]
FAIL: herm random, normalized(1), abs/desc (0.999999999999999112 observed vs 1
expected) [117860]





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