[NTG-context] new upload

[Hans Hagen <j.hagen@xs4all.nl>]

Hi,

In todays upload there is a follow up on a new feature that is already 
present in the previous upload (but that was not yet advertised):

   context --parallel test1.tex test2.tex test3.tex

   context --parallel --pattern=test*.tex

   context --parallellist myfile.cmd  (filters context processing lines)

   context --parallel test1.tex test2.tex test3.tex --terminal

The --parellel feature will run in parallel, By default upto 8 jobs but 
you can specify less or more depending on your hardware but on my 
machine this is reasonable.

See workflows-parrallel at the end for more info. That one also mentions 
the new --forceinput flag which makes that when these

   context foo-1.tex --mode=m-1 --forceinput=whatever.tex
   context foo-3.tex --mode=m-3 --forceinput=whatever.tex

are run in parallel there is no clash in tuc/pdf. Of course not all 
scenarios might work out well. Commandline arguments given are passed on 
to the different jobs but it's good enough for the purpose I have in mind.

fwiw: a single pass teststuite run (some 1950 files) goes down from 1350 
to 700 seconds but another run with 1200 complex xml documents goes 4 
times faster. In the end this is way cheaper than updating a 5 year old 
dev machine (a new one would run about twice as fast which would bring 
about the same gain).

Hans

ps. Because tex is a memory intense application it doesn't scale with 
the number of cores unless one has the latest greatest fast memory as 
well as generous cpu caches. There's only so much one can do in the code 
base about it.

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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