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Re: Several Topics - Nov. 19, 2013

Cross-posted to 3 groups.

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In comp.lang.fortran E.D.G. <edgrsprj@ix.netcom.com> wrote:
>>> "E.D.G." <edgrsprj@ix.netcom.com> wrote in message 
>>> news:ro-dnch2dPtbRhnPnZ2dnUVZ_rSdnZ2d@earthlink.com...
> Posted by E.D.G. on November 19, 2013
 
> 1.  PERL PDL CALCULATION SPEED VERSUS PYTHON AND FORTRAN
 
(snip)

>       This program translation project has become one of the most 
> surprisingly successful programming projects I have worked on to date.  A 
> considerable amount of valuable information has been sent to me by E-mail in 
> addition to all of the information posted to the Newsgroups.
 
>       The original posts actually discussed calculation speed matters 
> involving Perl and Python.  And responses indicated that there were ways to 
> develop routines that could dramatically accelerate Python calculations. 
> But it did not sound like there were any for Perl.

In general, language processors can be divided into two categories
called compilers and interpreters.  Compilers generate instructions for
the target processors. Interpreters generate (usually) an intermediate
representation which is then interpreted by a program to perform the
desired operations. That latter tends to be much slower, but more
portable.

There are a few langauges that allow dynamic generation of code, which
often makes compilation impossible, and those languages tend to be
called 'interpreted langauges'. 

Some years ago when working with perl programs that ran too slow, we
found a perl to C translator. Surprisingly, the result ran just as slow!
It turns out that the perl to C translator generates a C program
containing the intermediate code and the interpreter, and so runs just
the same speed.

More recently, there are JIT systems which generate the intermediate
code, but then at the appropriate time (Just In Time) compile that to
machine code and execute it. This is common for Java, and more recently
for languages like Matlab.

-- glen

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Program Translation - Nov. 14, 2013 "E.D.G." <edgrsprj@ix.netcom.com> - 2013-11-14 08:18 -0600
  Re: Program Translation - Nov. 14, 2013 mecej4 <mecej4_nospam@operamail.com> - 2013-11-14 11:07 -0600
    Re: Program Translation - Nov. 14, 2013 Gordon Sande <Gordon.Sande@gmail.com> - 2013-11-14 13:36 -0400
      Re: Program Translation - Nov. 14, 2013 Clive Page <usenet@page2.eu> - 2013-11-15 11:46 +0000
    Re: Program Translation - Nov. 14, 2013 Jürgen Exner <jurgenex@hotmail.com> - 2013-11-17 09:02 -0800
  Re: Program Translation - Nov. 14, 2013 "E.D.G." <edgrsprj@ix.netcom.com> - 2013-11-15 07:51 -0600
    Re: Program Translation - Nov. 14, 2013 "E.D.G." <edgrsprj@ix.netcom.com> - 2013-11-17 04:25 -0600
      Re: Program Translation - Nov. 14, 2013 Ben Bacarisse <ben.usenet@bsb.me.uk> - 2013-11-17 12:45 +0000
        Re: Program Translation - Nov. 14, 2013 "E.D.G." <edgrsprj@ix.netcom.com> - 2013-11-17 08:37 -0600
          Re: Program Translation - Nov. 14, 2013 Henry Law <news@lawshouse.org> - 2013-11-17 14:42 +0000
            Re: Program Translation - Nov. 14, 2013 Roy Smith <roy@panix.com> - 2013-11-17 10:20 -0500
              Re: Program Translation - Nov. 14, 2013 Chris Angelico <rosuav@gmail.com> - 2013-11-18 02:28 +1100
              Re: Program Translation - Nov. 14, 2013 "E.D.G." <edgrsprj@ix.netcom.com> - 2013-11-17 10:25 -0600
                Re: Program Translation - Nov. 14, 2013 Tim Prince <tprince@computer.org> - 2013-11-17 08:30 -0800
                Re: Program Translation - Nov. 14, 2013 Roy Smith <roy@panix.com> - 2013-11-17 11:43 -0500
                Re: Program Translation - Nov. 14, 2013 nospam@see.signature (Richard Maine) - 2013-11-17 09:05 -0800
                Re: Program Translation - Nov. 14, 2013 Joel Goldstick <joel.goldstick@gmail.com> - 2013-11-17 12:29 -0500
                Re: Program Translation - Nov. 14, 2013 "E.D.G." <edgrsprj@ix.netcom.com> - 2013-11-18 11:30 -0600
              Re: Program Translation - Nov. 14, 2013 Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2013-11-17 18:59 +0000
          Re: Program Translation - Nov. 14, 2013 "James Van Buskirk" <not_valid@comcast.net> - 2013-11-17 09:05 -0700
        Re: Program Translation - Nov. 14, 2013 Charlton Wilbur <cwilbur@chromatico.net> - 2013-11-17 23:22 -0500
      Re: Program Translation - Nov. 14, 2013 "E.D.G." <edgrsprj@ix.netcom.com> - 2013-11-17 10:17 -0600
        Re: Program Translation - Nov. 14, 2013 "E.D.G." <edgrsprj@ix.netcom.com> - 2013-11-17 12:07 -0600
      Re: Program Translation - Nov. 14, 2013 Terry Reedy <tjreedy@udel.edu> - 2013-11-17 22:28 -0500
        Re: Program Translation - Nov. 14, 2013 "E.D.G." <edgrsprj@ix.netcom.com> - 2013-11-18 11:15 -0600
          Re: Program Translation - Nov. 14, 2013 Joel Goldstick <joel.goldstick@gmail.com> - 2013-11-18 12:35 -0500
      Several Topics - Nov. 19, 2013 "E.D.G." <edgrsprj@ix.netcom.com> - 2013-11-19 05:26 -0600
        Re: Several Topics - Nov. 19, 2013 glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-11-19 20:51 +0000
          Re: Several Topics - Nov. 19, 2013 Yaşar Arabacı <yasar11732@gmail.com> - 2013-11-19 23:31 +0200
          Re: Several Topics - Nov. 19, 2013 Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2013-11-19 21:35 +0000
            Re: Several Topics - Nov. 19, 2013 glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-11-19 22:43 +0000
              Re: Several Topics - Nov. 19, 2013 Chris Angelico <rosuav@gmail.com> - 2013-11-20 10:01 +1100
              Re: Several Topics - Nov. 19, 2013 gamo <gamo@telecable.es> - 2013-11-20 21:48 +0100
  Re: Program Translation - Nov. 14, 2013 "Terence" <tbwright@bigpond.net.au> - 2013-11-16 20:31 +1100
    Re: Program Translation - Nov. 14, 2013 William Ray Wing <wrw@mac.com> - 2013-11-16 09:00 -0500

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