On 2013-01-07 20:50, Jeroen Demeyer wrote:
> On 2013-01-07 12:24, Jeroen Demeyer wrote:
>> I am running the command
>>
>> sage: time B =
>> ModularFormsRing(Gamma0(3)).modular_forms_of_weight(80).cuspidal_submodule().q_expansion_basis(prec=30)
>>
>> sage-5.4: 17.94 s
>> sage-5.5: 56.28 s
>
> I can
On 2013-01-08 09:11, Jeroen Demeyer wrote:
> On 2013-01-07 23:43, Volker Braun wrote:
>> But the command is mostly linear algebra over QQ. Its possible that the
>> old GCC does something very stupid, but I doubt that you can speed up
>> integer computations by a factor of 5x just by optimizing code
On 2013-01-07 23:43, Volker Braun wrote:
> But the command is mostly linear algebra over QQ. Its possible that the
> old GCC does something very stupid, but I doubt that you can speed up
> integer computations by a factor of 5x just by optimizing code paths. So
> it pretty much must be the blas ins
But the command is mostly linear algebra over QQ. Its possible that the old
GCC does something very stupid, but I doubt that you can speed up integer
computations by a factor of 5x just by optimizing code paths. So it pretty
much must be the blas inside linbox.
On Monday, January 7, 2013 9:1
On 2013-01-07 21:59, Volker Braun wrote:
> Its pretty clear that the newer GCC correctly vectorizes ATLAS for the
> CPU whereas the old one did not.
I doubt it's ATLAS. I didn't find any particular difference in the ATLAS
install logs. It's curious to see that ATLAS somehow brute-forces CPU
flags,
Its pretty clear that the newer GCC correctly vectorizes ATLAS for the CPU
whereas the old one did not.
On Monday, January 7, 2013 8:50:14 PM UTC, Snark wrote:
>
> >>
> ModularFormsRing(Gamma0(3)).modular_forms_of_weight(80).cuspidal_submodule().q_expansion_basis(prec=30)
>
>
> I'm still impre
Le 07/01/2013 20:50, Jeroen Demeyer a écrit :
On 2013-01-07 12:24, Jeroen Demeyer wrote:
I am running the command
sage: time B =
ModularFormsRing(Gamma0(3)).modular_forms_of_weight(80).cuspidal_submodule().q_expansion_basis(prec=30)
sage-5.4: 17.94 s
sage-5.5: 56.28 s
I can confirm that buil
On 2013-01-07 12:24, Jeroen Demeyer wrote:
> I am running the command
>
> sage: time B =
> ModularFormsRing(Gamma0(3)).modular_forms_of_weight(80).cuspidal_submodule().q_expansion_basis(prec=30)
>
> sage-5.4: 17.94 s
> sage-5.5: 56.28 s
I can confirm that building Sage with GCC-4.2.4 gives the s
On 2013-01-07 15:27, John Cremona wrote:
> On 7 January 2013 14:27, Jeroen Demeyer wrote:
>> On 2013-01-07 12:24, Jeroen Demeyer wrote:
>>> I am running the command
>>>
>>> sage: time B =
>>> ModularFormsRing(Gamma0(3)).modular_forms_of_weight(80).cuspidal_submodule().q_expansion_basis(prec=30)
>>
On 7 January 2013 14:27, Jeroen Demeyer wrote:
> On 2013-01-07 12:24, Jeroen Demeyer wrote:
>> I am running the command
>>
>> sage: time B =
>> ModularFormsRing(Gamma0(3)).modular_forms_of_weight(80).cuspidal_submodule().q_expansion_basis(prec=30)
>>
>> sage-5.4: 17.94 s
>> sage-5.5: 56.28 s
>
> F
On 2013-01-07 12:24, Jeroen Demeyer wrote:
> I am running the command
>
> sage: time B =
> ModularFormsRing(Gamma0(3)).modular_forms_of_weight(80).cuspidal_submodule().q_expansion_basis(prec=30)
>
> sage-5.4: 17.94 s
> sage-5.5: 56.28 s
False alarm, the cause seems to be differing GCC versions o
On 2013-01-07 15:14, David Loeffler wrote:
> That's very strange! The time-critical part of that computation is
> almost entirely in doing linear algebra with the coefficients of power
> series -- it bypasses most of the modular symbols code, which would be
> very inefficient in this example since
That's very strange! The time-critical part of that computation is almost
entirely in doing linear algebra with the coefficients of power series --
it bypasses most of the modular symbols code, which would be very
inefficient in this example since the level is small and the weight large
-- and oddl
Actually, the slowdown is in 5.4 -> 5.4.1, which narrows it down quite a
lot:
http://boxen.math.washington.edu/home/release/sage-5.4.1/tickets.html
On 2013-01-07 12:24, Jeroen Demeyer wrote:
> I am running the command
>
> sage: time B =
> ModularFormsRing(Gamma0(3)).modular_forms_of_weight(80).c
I am running the command
sage: time B =
ModularFormsRing(Gamma0(3)).modular_forms_of_weight(80).cuspidal_submodule().q_expansion_basis(prec=30)
sage-5.4: 17.94 s
sage-5.5: 56.28 s
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