Re: [sage-devel] git fetch warning about /home/erik_m_bray

2016-10-05 Thread Daniel Krenn
On 2016-10-05 17:12, Erik Bray wrote: > On Wed, Oct 5, 2016 at 4:58 PM, Erik Bray wrote: >> On Wed, Oct 5, 2016 at 12:26 PM, Jeroen Demeyer >> wrote: >>> When running "git fetch", I get >>> >>> remote: warning: unable to access >>> '/home/erik_m_bray/.config/git/attributes': Permission denied >>

Re: [sage-devel] git fetch warning about /home/erik_m_bray

2016-10-05 Thread Erik Bray
On Wed, Oct 5, 2016 at 5:12 PM, Erik Bray wrote: > On Wed, Oct 5, 2016 at 4:58 PM, Erik Bray wrote: >> On Wed, Oct 5, 2016 at 12:26 PM, Jeroen Demeyer >> wrote: >>> When running "git fetch", I get >>> >>> remote: warning: unable to access >>> '/home/erik_m_bray/.config/git/attributes': Permissi

Re: [sage-devel] git fetch warning about /home/erik_m_bray

2016-10-05 Thread Erik Bray
On Wed, Oct 5, 2016 at 4:58 PM, Erik Bray wrote: > On Wed, Oct 5, 2016 at 12:26 PM, Jeroen Demeyer > wrote: >> When running "git fetch", I get >> >> remote: warning: unable to access >> '/home/erik_m_bray/.config/git/attributes': Permission denied > > Confirmed--this is only for git:// too. I w

Re: [sage-devel] git fetch warning about /home/erik_m_bray

2016-10-05 Thread Erik Bray
On Wed, Oct 5, 2016 at 12:26 PM, Jeroen Demeyer wrote: > When running "git fetch", I get > > remote: warning: unable to access > '/home/erik_m_bray/.config/git/attributes': Permission denied Confirmed--this is only for git:// too. I was the last person to restart git-daemon on the server. But I

Re: [sage-devel] git fetch warning about /home/erik_m_bray

2016-10-05 Thread Daniel Krenn
On 2016-10-05 12:26, Jeroen Demeyer wrote: > When running "git fetch", I get > > remote: warning: unable to access > '/home/erik_m_bray/.config/git/attributes': Permission denied I get the same. (posted at https://groups.google.com/d/msg/sage-release/gPJzDIKgkbM/vpmw872OCQAJ) -- You received t

Re: [sage-devel] hash of QQbar inefficient

2016-10-05 Thread Clemens Heuberger
Hi, Am 2016-10-05 um 01:33 schrieb Thierry: > Could you reproduce your issue with sufficiently enough other polynomials > or is it just that one ? I can offer to more such polynomials: x = polygen(QQ, 'x') rho1 = QQbar.polynomial_root(x^7 + 37985/2366*x^6 + 116073/2366*x^5 - 34406/1183*x^4 + 13

[sage-devel] git fetch warning about /home/erik_m_bray

2016-10-05 Thread Jeroen Demeyer
When running "git fetch", I get remote: warning: unable to access '/home/erik_m_bray/.config/git/attributes': Permission denied -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, se

Re: [sage-devel] multithreading performance issues

2016-10-05 Thread Clement Pernet
To follow up on Jean-Pierre summary of the situation: The current version of fflas-ffpack in sage (v2.2.2) uses the BLAS provided as is. Running it with a multithreaded BLAS may result in a slower code than with a single threaded BLAS. This is very likely due to memory transfer and coherence pr

Re: [sage-devel] multithreading performance issues

2016-10-05 Thread Jean-Pierre Flori
Currently OpenBlas does what it wants for multithreading. We hesitated to disable it but prefered to wait and think about it: see https://trac.sagemath.org/ticket/21323. You can still influence its use of threads setting OPENBLAS_NUM_THREADS. See the trac ticket, just note that this is not Sage sp

Re: [sage-devel] multithreading performance issues

2016-10-05 Thread Thierry Dumont
What is the size of the matrix you use ? Whatever you do, openmp in blas is interesting only if you compute with large matrices. If your computations are embedded in an @parallel and launch n processes, be careful that your OMP_NUM_THREADS be less or equal to ncores/n. My experience is (I am do