Re: [Vxl-maintainers] vnl test_alignment dashboard failures

[Matt L. <mat...@gm...>]

Ian,

  The test also passes on my machine as long as SSE2 is disabled.
However, when SSE2 is enabled various parts of the test that do not
have alignment issues start to fail.  The parts that do have alignment
issues cause the test to crash.  After closer inspection of the
failing test statements, it seems that they are failing because the
tolerance is just a little too small in some cases.  For example, the
residual of a computation may be 8e^-7 when the tolerance is 5e^-7.
This only happens occasionally, and the particular tests which fail
vary from run to run because the inputs are random numbers.  The
dashboard builds that are failing seem to follow the same trend with
different parts of test failing from day to day.  So I would imagine
that these failures are related to tolerances.

--Matt

On Fri, Feb 29, 2008 at 6:28 AM, Ian Scott
<ian...@st...> wrote:
> Hi,
>
>  Does anybody know why vnl_test_alignment is failing on some platforms on
>  the Dashboard?
>
>  I wrote the test a few months ago, and I'm ashamed to say I don't
>  remember checking that it passed on all dashboard platforms when I wrote
>  it. The test was designed to pave the way for a fix of the SSE
>  optimisations for VNL (currently disabled.) The failing platforms do not
>  appear to be using SSE according to their notes files, but I can't think
>  of any other reason why those test would fail. My own "Linux 2.6 gcc
>  4.0.2 x64 -O2" and "MSVC 8.0" builds work fine.
>
>  The tests basically try to do a set of vec-vec and vec-matrix functions
>  reading and writing data at various offsets in memory. All the offsets
>  are still 4-byte aligned so I am a bit stumped as to the reason for the
>  failures.
>
>  I'm off work next week, but if no body has any ideas I will start doing
>  debugging via the dashboard sometime after I get back.
>
>  Ian.
>
>
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