Subject: write_data spends too much time to create file.
From: Stefano Ferri
Date: Fri, 6 Aug 2010 09:59:01 +0200
With the new version of numericalio.lisp, also with Clsip all seems to
work fine.
(%i5)write_data(new,"new.dat");
Evaluation took 0.2270 seconds (0.2539 elapsed) using 1.424 MB.
(%o5) done
Thank you
Stefano
2010/8/5 Robert Dodier <robert.dodier at gmail.com>:
> On 8/3/10, Stefano Ferri <ferriste at gmail.com> wrote:
>
>> (%i4) write_data(new,"new.dat");
>> Evaluation took 0.9519 seconds (52.9844 elapsed) using 2.362 MB.
>
> After looking at this a bit, I guess the problem is that Clisp
> implementation of FINISH-OUTPUT takes a lot of time
> (relatively speaking). FINISH-OUTPUT is called at the end of
> each line in the current version of numericalio.lisp (yes, it doesn't
> have to be, I agree). Do you see a difference in the time to
> create a file with many lines versus a file with the same number
> of elements but just one line? e.g.
>
> x : matrix (makelist (i, i, 1, 1000)) $
> write_data (x, "foo1.data");
> write_data (transpose (x), "foo2.data");
>
> I've changed numericalio.lisp to call FINISH-OUTPUT at most once.
> You can get the new version from CVS, via the web interface if you like:
> http://maxima.cvs.sourceforge.net/viewvc/maxima/maxima/share/contrib/numericalio/
>
> Looks like suboptimal behavior on the part of Clisp but I
> wouldn't call it a bug.
>
> best
>
> Robert Dodier
>