On Jul 31, 2015, at 08:36 , Pierre wrote: > Hi, > > I have asked a version of this question here: > > https://groups.google.com/forum/#!topic/sage-support/2KJQhOf-N7Y > > However I now have a minimal working example, and sage-devel is perhaps > better than sage-support for this question (is it?) > > So when working with multivariable polynomials over ZZ and taking the sum > of two ideals, things are inexplicably slow on sagemathcloud. Try the > following: > > S.<a, b>= ZZ[] > L= [ S.random_element() for i in range(500) ] > def test(): > foo= []*S > for P in L: > foo= foo + [P]*S > > %timeit test() > > On my local machine (macbook with sage 6.2), which for anything else is > slower than the cloud, i get about 170ms (i've tried it with L > reconstructed a few times). > On sagemathcloud, it's about 3.8 seconds. 20 times slower !
For the record, I get (OS X, 10.10.4, Quad-core Core i7, 2.6 GHz) 6.2: 82 ms 6.7: 2.8 s 6.8: 71 ms So you are not wrong, but it's not SMC. HTH -- Justin C. Walker, Curmudgeon at Large Institute for the Absorption of Federal Funds -- Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote. -- 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, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
