[Numpy-discussion] Buildbot failures since r5443

[Charles R Harris]

On Thu, Jul 17, 2008 at 3:51 AM, Neil Muller
<drnlmuller+scipy at gmail.com<drnlmuller%2Bscipy at gmail.com>>
wrote:

> On Thu, Jul 17, 2008 at 10:51 AM, Robert Kern <robert.kern at gmail.com>
> wrote:
> > On Thu, Jul 17, 2008 at 03:19, Pauli Virtanen <pav at iki.fi> wrote:
> >> Hi,
> >>
> >> Since r5443 the Sparc buildbots show a "Bus error" in the test phase:
> >>
> >>        http://buildbot.scipy.org/builders/Linux_SPARC_64_Debian/
> >> builds/102/steps/shell_2/logs/stdio
> >>
> >> while the one on FreeBSD-64 passes.
> >
> > In the test that's failing (test_filled_w_flexible_dtype), a
> > structured array with a dtype of [('i',int), ('s','|S3'), ('f',float)]
> > is created. I'm guessing that the final C double in that record is not
> > getting aligned properly. On that architecture, I'm willing to bet
> > that doubles need to be aligned on a 4-byte or 8-byte boundary.
>
> The Sparc ABI requires that doubles be aligned on a 4-byte boundary.
> However, gcc uses instructions which require 8-byte alignment of
> doubles on SPARC by default - there are a couple of flags which can be
> used to force 4-byte alignment, but that imposes a (usually
> significant) speed penalty. AFAIK, the Solaris compilers also require
> 8-byte alignment for doubles.
>
> > In [4]: from numpy import dtype
> >
> > In [5]: dtype([('i',int), ('s','|S3'), ('f',float)]).fields.items()
> > Out[5]:
> > [('i', (dtype('int32'), 0)),
> >  ('s', (dtype('|S3'), 4)),
> >  ('f', (dtype('float64'), 7))]
>
>
> >>>  os.uname()[4]
> 'sparc64'
> >>> from numpy import dtype
> >>> dtype([('i',int), ('s','|S3'), ('f',float)]).fields.items()
>
> [('i', (dtype('int32'), 0)), ('s', (dtype('|S3'), 4)), ('f',
> (dtype('float64'), 7))]
>

I wonder what descr->alignment is for doubles on SPARC.

Chuck
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