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Re: [Gcl-devel] [Maxima-discuss] speed of reading data files, was: insta

From: Camm Maguire
Subject: Re: [Gcl-devel] [Maxima-discuss] speed of reading data files, was: installation problems
Date: Sat, 14 Nov 2015 08:49:14 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.4 (gnu/linux)

Thanks!  I'll take a look....

BTW, when benchmarking GCL, it is often useful to make use of the
builtin gprof interface.  On a linux box with a gcl .deb installed, you
can get a profiling image with export GCL_PROF=t.  When building from
source, ./configure ... --enable-gprof.  The profiling images are of
course slower, but reveal bottlenecks.  

Build maxima atop a profiling image, then

(%i1) :lisp (si::gprof-start)
(%i2) ....
(%i3) :lisp (si::gprof-quit)

Take care,

Gunter Königsmann <address@hidden> writes:

> Perhaps you might want to have the test file I have used for my measurements.
> Did add it in both .wxmx and .mac format.
> Kind regards,
>  Gunter.
> On Fr, Nov 13, 2015 at 7:48 , Robert Dodier <address@hidden> wrote:
>     On 2015-11-13, Gunter Königsmann <address@hidden> wrote:
>         - read_matrix() was slow reading files with >10k data lines. Don't 
> know if it will be higher when using a more current release of gcl than
>         the one that was bundled with the gcl installers; On windows the 
> reading speed seems to be greatly influenced by the function used for
>         doing file I/O.
>     The function read_matrix and friends are written in a pretty naive way. I 
> wouldn't be surprised if they could be improved. I would really like
>     for Maxima to be able to read data files (and 10k lines is pretty small 
> these days so that's a disappointment) so if you can investigate a
>     little bit to say which functions are faster and which are slower, 
> perhaps we can see where is the bottleneck in the slow functions and improve
>     that. best Robert Dodier 
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Camm Maguire                                        address@hidden
"The earth is but one country, and mankind its citizens."  --  Baha'u'llah

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