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.guil...@gmail.com> 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+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. > > > > -- > 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.
