Kevin Acres on Sun, 15 Sep 2019 13:01:01 +0200


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Re: Ellsea


Sorry, I don’t have an example to easily send. I’d been using ellap but wanted the early abort feature of ellsea.

Using a curve ellinit([0,0,0,-3,b], 2^285-9) with b in the range from 10^7 upwards. It probably crashed before 90 iterations of b. I couldn’t establish the failure point though. The parvector had a size of 256 with 10 threads assigned. 


> On 15 Sep 2019, at 14:47, Karim Belabas <Karim.Belabas@math.u-bordeaux.fr> wrote:
> 
> * Kevin Acres [2019-09-15 12:43]:
>> Just a quick note that I think ellsea may not be threadsafe.  I’m seeing
>> impossible inverse in gmodgs:0 when using parvector and 10 threads. Single
>> threaded it’s ok. 
> 
> Do you have an easy to reproduce example ? Config is Linux + pthreads ?
> 
> Cheers,
> 
>    K.B.
> --
> Karim Belabas, IMB (UMR 5251)  Tel: (+33) (0)5 40 00 26 17
> Universite de Bordeaux         Fax: (+33) (0)5 40 00 21 23
> 351, cours de la Liberation    http://www.math.u-bordeaux.fr/~kbelabas/
> F-33405 Talence (France)       http://pari.math.u-bordeaux.fr/  [PARI/GP]
> `
>