On Nov 3, 9:13 am, "John Cremona" <[EMAIL PROTECTED]> wrote:
> Does this help you:
>
> Suppose (for a toy example) I have defined a Python function like this:
> sage: def f(M):
> ....: d = M.det()
> ....: return d
>
> And I have a file called testin.sage containing a large number of
> lines like this:
>
> [[1,2],[3,4]]
> [[5,6],[7,8]]
> [[1,2],[3,4]]
> [[5,6],[7,8]]
> [[1,2],[3,4]]
> [[5,6],[7,8]]
>
> Then from the command line I can do this:
>
> sage: for l in open("/home/masgaj/testin.sage"):
> print(f(Matrix(eval(l))))
>
> and what I see is this:
> -2
> -2
> -2
> -2
> -2
> -2
>
> As far as I know Python only reads the lines in the file one at at
> time, and returns each as a string (hence the eval()), which you can
> do what you like with.
>
> I did something similar when I wanted to process a million elliptic
> curves without reading them all in at once.
>
> John
Yep, the "load" is the expensive operation:
[EMAIL PROTECTED]:/scratch/mabshoff/release-cycle/sage-3.1.3.final$ ./sage
----------------------------------------------------------------------
| Sage Version 3.2.alpha2, Release Date: 2008-10-31 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: time load SPOCs.sage
CPU times: user 67.46 s, sys: 8.94 s, total: 76.40 s
Wall time: 76.59 s
sage: get_memory_usage()
3700.5625
sage: time save (SPOC,'SPOCs.sobj')
CPU times: user 17.63 s, sys: 0.08 s, total: 17.71 s
Wall time: 17.71 s
sage: get_memory_usage()
3700.5625
sage:
Exiting SAGE (CPU time 7m27.07s, Wall time 18m2.26s).
[EMAIL PROTECTED]:/scratch/mabshoff/release-cycle/sage-3.1.3.final$ ./sage
----------------------------------------------------------------------
| Sage Version 3.2.alpha2, Release Date: 2008-10-31 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: time load('SPOCs.sobj')
CPU times: user 7.10 s, sys: 0.60 s, total: 7.70 s
Wall time: 7.70 s
What is off is that according to top the load operation took about 600
seconds CPU time, so where is the time going?
Cheers,
Michael
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