OK cool ! Thanks again ! On Friday, July 31, 2015 at 10:40:46 PM UTC+2, Justin C. Walker wrote: > > > 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. > > > >
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