On Wed, May 8, 2013 at 7:33 PM, Francois Bissey
<francois.bis...@canterbury.ac.nz> wrote:
> On 09/05/13 14:27, leif wrote:
>> Kwankyu Lee wrote:
>>>     For example, can you stop everything on the computer and remote log
>>>     in to it from another machine, so you're hardly running anything on
>>>     it? If not, quit all possible applications and try building again.
>>>     By the way, how much RAM does this machine have (this may not be
>>>     relevant, but just in case)?
>>>
>>>
>>> There were running two virtual machines. So I rebooted the computer, and
>>> opened just a terminal, and in the pristine state issued the command
>>> "./sage -i zn_poly". To my surprise, it still fails. It has 16GB ram.
>>
>> Well, that still doesn't imply the machine isn't loaded otherwise.
>>
>>
>> -leif
>>
>> P.S.:  I strongly doubt GCC's version matters here.
>>
>
> I f I were you I wouldn't be o sure. I became involved in that bug
> when I stumbled on a similar one porting to power7
> http://trac.sagemath.org/sage_trac/ticket/14098
> the version of gcc on that platform had an impact. The main
> problem here is that zn_poly tuning parameters are completely
> wrong. zn_poly is abandoned upstream and the tunning routines
> are probably not aging well to support new cpu, compilers and OS.

It might not exactly be totally abandoned upstream (it's more "done"):
Here's what the author (David Harvey) wrote to me offlist earlier
today about this thread: "Hi, Not obvious to me what the problem is
from reading the thread. Probably a bug in zn_poly.  I'm about to
leave on a camping trip.... I will take a look next week."

>
> Francois
>
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-- 
William Stein
Professor of Mathematics
University of Washington
http://wstein.org

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