On Dec 10, 6:46 am, "Mike Hansen" <[EMAIL PROTECTED]> wrote:
> In case you're curious, here are some timings for higher powers along
> with memory usage.
>
> sage: s = SFASchur(QQ)
> sage: f = s([2,1])
> sage: get_memory_usage()
> 515.17578125
>
> sage: time a = f^10
> CPU times: user 6.64 s, sys: 0.03 s, total: 6.67 s
> Wall time: 6.74
> sage: get_memory_usage()
> 526.26171875 #11MB
>
> sage: time a = f^11
> CPU times: user 30.18 s, sys: 0.05 s, total: 30.23 s
> Wall time: 30.98
> sage: get_memory_usage()
> 536.171875 #21MB
>
> sage: time a = f^12
> CPU times: user 116.47 s, sys: 0.13 s, total: 116.60 s
> Wall time: 119.75
> sage: get_memory_usage()
> 554.5 #39MB
>
> sage: time a = f^13
> CPU times: user 437.49 s, sys: 0.44 s, total: 437.94 s
> Wall time: 444.04
> sage: get_memory_usage()
> 585.796875 #70MB
> sage: len(a)
> 30641
>
> I believe that there is eventual room for improvement in the memory usage.
>
> --Mike
>
> On Dec 9, 2007 10:44 PM, BFJ <[EMAIL PROTECTED]> wrote:
>
>
>
> > That was fast!
>
> > Thanks for looking into the problem. I'll be doing more extensive
> > calculations over the next couple of weeks (I'm porting some Maple
> > code). I'll let you know if I run into any other problems. I'm excited
> > about the prospect of a 17-fold performance increase.
>
> > Thanks very much,
You can test those improvements yourself by building
http://sage.math.washington.edu/home/mabshoff/sage-2.9.alpha4.tar
[182 MB]. Assuming you have the standard build tools it should build
in about two hours. You can also wait for 2 days and 2.9 should be
released in binary form.
Cheers,
Michael
>
> > --
> > [EMAIL PROTECTED]
>
> > On Dec 9, 11:34 pm, "Mike Hansen" <[EMAIL PROTECTED]> wrote:
> > > Hello,
>
> > > The actual issue was that I forgot to covert symmetrica's LONGINT type
> > > ( 22 ) over to the correct Sage type. I hadn't actually tested it
> > > with calculations that got up to numbers that big. I made a ticket
> > > for this and posted a patch:http://sagetrac.org/sage_trac/ticket/1445
> > > It will be in the next version ( 2.9 ) which will come out in about 3
> > > days.
>
> > > --Mike
>
> > > On Dec 9, 2007 10:01 PM, [EMAIL PROTECTED]
>
> > > <[EMAIL PROTECTED]> wrote:
>
> > > > I'm trying to use the combinatorics features in Sage to do some Chern
> > > > class calculations. When I run the commands below, I get exceptions
> > > > that I don't know how to interpret.
>
> > > > The same calculation in Maple using John Stembridge's SF package
> > > > completes successfully using roughly 149 MB and 7.08 s CPU time.
>
> > > > Is this just an issue of memory limitation? If so, can (and how do) I
> > > > lift the limitation to access more of the 2 GB I have on the machine
> > > > I'm running this on?
>
> > > > code follows:
> > > > I'm using Sage 2.8.15 on an i386 Linux platform. I also tried this on
> > > > an Intel OS X 10.5 machine with the same result. Also, all the powers
> > > > of "f" from 1 to 7 work fine. f^8 and higher powers fail.
> > > > -----------------------------------
>
> > > > sage: s=SFASchur(QQ)
> > > > sage: f=s([2,1]); f
> > > > s[2, 1]
> > > > sage: f^8
> > > > ---------------------------------------------------------------------------
> > > > <type 'exceptions.NotImplementedError'> Traceback (most recent call
> > > > last)
>
> > > > /Users/benjaminjones/Desktop/sage-2.8.15-osx10.5-intel-i386-Darwin/
> > > > <ipython console> in <module>()
>
> > > > /Users/benjaminjones/Desktop/sage-2.8.15-osx10.5-intel-i386-Darwin/
> > > > local/lib/python2.5/site-packages/sage/combinat/sfa.py in
> > > > __pow__(self, n)
> > > > 881 z = A(Integer(1))
> > > > 882 for i in range(n):
> > > > --> 883 z *= self
> > > > 884 return z
> > > > 885
>
> > > > /Users/benjaminjones/Desktop/sage-2.8.15-osx10.5-intel-i386-Darwin/
> > > > element.pyx in sage.structure.element.RingElement.__imul__()
>
> > > > .
> > > > .
> > > > .
> > > > .
>
> > > > /Users/benjaminjones/Desktop/sage-2.8.15-osx10.5-intel-i386-Darwin/
> > > > symmetrica.pxi in sage.libs.symmetrica.symmetrica._py()
>
> > > > <type 'exceptions.NotImplementedError'>: 22
> > > > sage:
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