Thanks for your answers ! Let's hope it is fixed by 6.8 then. I shall refrain from upgrading to 6.7 on my machine :-)
(and for 6.8 I will wait for osx binaries, and until I've upgraded to OSX 10.10) On Friday, July 31, 2015 at 6:36:03 PM UTC+2, Johan S. R. Nielsen wrote: > > Hi, > > The test takes about 92ms on my laptop (Sage 6.8.rc1, core i7-4600 @ 2.10 > GHz). > > So if it's a Sage 6.7-thing, it's fixed again :-) > > Johan > > > William Stein writes: > > > On Fri, Jul 31, 2015 at 8:36 AM, Pierre <pierre....@gmail.com > <javascript:>> 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 ! > >> > >> Using %prun, it seems that a lot of time is spend by {map} ... ???? > >> > >> Also note that on the cloud, there is a warning message about > computations > >> over ZZ, using singular, not being trustworthy. Sage 6.2 doesn't have > that. > >> Could it have an effect on the speed? > >> > >> Anyway, just wanted to point this out. It would be lovely if this could > be > >> fixed as some point. I'm really enjoying the cloud ! > > > > > > This isn't really a question relevant to SageMathCloud. It's a > > question about Sage-6.7 (which is the current version in the cloud) > > and Sage-6.2, which is what you're comparing with. I would not be > > surprised if you were to do the same test on Sage-6.7 on your laptop, > > if it would also be slow. > > > > It is, of course, a good question to be asking. I hope somebody will > > run your benchmark on a sage-6.7 install not in SageMathCloud and > > report. > > > > I will upgrade SMC to sage-6.8 sometime soon -- I don't know if that > will help. > > > > -- William > > > >> > >> Thanks, > >> Pierre > >> > >> > >> -- > >> 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+...@googlegroups.com <javascript:>. > >> To post to this group, send email to sage-...@googlegroups.com > <javascript:>. > >> Visit this group at http://groups.google.com/group/sage-devel. > >> For more options, visit https://groups.google.com/d/optout. > > > > > > > > -- > > William (http://wstein.org) > > -- > -- 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.
