[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: Bug#875618: openblas: please enable build on s390x

On 09/14/2017 09:58 AM, Sébastien Villemot wrote:
> On Wed, Sep 13, 2017 at 08:33:08PM +0000, PICCA Frederic-Emmanuel wrote:
>> Hello 
>>> Unfortunately it does not look that simple. OpenBLAS is optimized for z13, but
>>> our s390x port is supposed to support all the z systems (see [1]).
>> what about asking for a a z13-support package to the isa-support (source
>> package) maintainer. This way it could be possible to upload an optimise
>> vesion of openblas which can install on recent enought s390x machines.
> I am not totally convinced by this solution. If we adopt it, somebody who
> installs e.g. octave on an old system-z machine will be hit by a failure in the
> dpkg installation process, which needs manual intervention. This is likely to
> generate problems in automated installers (and also confuse and annoy system
> admins).
>> the question will be then : does the buildd support these instructions ?
> I leave that to the s390 porters to answer.

FWIW, some years ago I did the atlas port for s390x. For dynamic linking the atlas
build/package process did support the exploitation of ELF HW_CAPS. So you could 
build a z900 (generic) and a z13 variant which is then picked by the linker at 
runtime. No idea if openblas allows the same. Of course the static variant (.a) 
must be the generic one.


Reply to: