Re: [sage-devel] [sage-cloud] slowness with sums of ideals in ZZ[a, b]
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.= 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.
Re: [sage-devel] [sage-cloud] slowness with sums of ideals in ZZ[a, b]
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.= 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.
Re: [sage-devel] [sage-cloud] slowness with sums of ideals in ZZ[a, b]
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 > 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.= 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 .
> >> To post to this group, send email to sage-...@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)
>
> --
>
--
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Re: [sage-devel] [sage-cloud] slowness with sums of ideals in ZZ[a, b]
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 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.= 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)
--
--
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Re: [sage-devel] [sage-cloud] slowness with sums of ideals in ZZ[a, b]
On Fri, Jul 31, 2015 at 8:36 AM, 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.= 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)
--
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