[Numpy-discussion] Buildbot failures since r5443
Thu Jul 17 04:51:19 CDT 2008
On Thu, Jul 17, 2008 at 10:51 AM, Robert Kern <email@example.com> wrote:
> On Thu, Jul 17, 2008 at 03:19, Pauli Virtanen <firstname.lastname@example.org> wrote:
>> Since r5443 the Sparc buildbots show a "Bus error" in the test phase:
>> 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 : from numpy import dtype
> In : dtype([('i',int), ('s','|S3'), ('f',float)]).fields.items()
> [('i', (dtype('int32'), 0)),
> ('s', (dtype('|S3'), 4)),
> ('f', (dtype('float64'), 7))]
>>> from numpy import dtype
>>> dtype([('i',int), ('s','|S3'), ('f',float)]).fields.items()
[('i', (dtype('int32'), 0)), ('s', (dtype('|S3'), 4)), ('f',
I've got a gmail account. Why haven't I become cool?
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