reducing compile time

reducing compile time

[Alan Stone]

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- does using \doifundefined{myMacro}{...} shorten tex runs/compile time ?

- what are the features to avoid for shortest compile times ?

-- 
Alan

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Re: reducing compile time

[Alan Stone]

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On Mon, Feb 23, 2009 at 6:16 PM, Alan Stone
<software.list.1es9s@gmail.com>wrote:

> - does using \doifundefined{myMacro}{...} shorten tex runs/compile time ?
>

I mean...

 \doifundefined{myMacro}{\def\myMacro{...}}


>  - what are the features to avoid for shortest compile times ?
>
> --
> Alan
>



-- 
Alan

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Re: reducing compile time

[Wolfgang Schuster]

Am 23.02.2009 um 18:16 schrieb Alan Stone:

> - does using \doifundefined{myMacro}{...} shorten tex runs/compile  
> time ?

In which way?

> - what are the features to avoid for shortest compile times ?

Depends on your document and what do you want.

To give you a better answer speak in complete sentences.

Wolfgang

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Re: reducing compile time

[Alan Stone]

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On Mon, Feb 23, 2009 at 6:54 PM, Wolfgang Schuster <
schuster.wolfgang@googlemail.com> wrote:

>
> Am 23.02.2009 um 18:16 schrieb Alan Stone:
>
>  - does using \doifundefined{myMacro}{...} shorten tex runs/compile time ?
>>
>
> In which way?


As I don't know/understand what happens between (Lua)TeX runs, to keep macro
definitions in memory.

- what are the features to avoid for shortest compile times ?
>
> Depends on your document and what do you want.


My question was intended in a generic way, aka if you use

- these features ... expect longer or significant longer compile times, or
- these features ... generate the longest compile times.


> To give you a better answer speak in complete sentences.
>
> Wolfgang
>
>

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Re: reducing compile time

[Alan Stone]

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On Mon, Feb 23, 2009 at 8:57 PM, Alan Stone
<software.list.1es9s@gmail.com>wrote:

>  On Mon, Feb 23, 2009 at 6:54 PM, Wolfgang Schuster <
> schuster.wolfgang@googlemail.com> wrote:
>
>>
>> Am 23.02.2009 um 18:16 schrieb Alan Stone:
>>
>> - does using \doifundefined{myMacro}{...} shorten tex runs/compile time ?
>>>
>>
>> In which way?
>
>
> As I don't know/understand what happens between (Lua)TeX runs, to keep
> macro definitions in memory.
>

Correction: to avoid spending time redefining macros in case their
definitions are kept in memory between Lua(TeX) runs.


>
>
>  - what are the features to avoid for shortest compile times ?
>>
>> Depends on your document and what do you want.
>
>
> My question was intended in a generic way, aka if you use
>
> - these features ... expect longer or significant longer compile times, or
> - these features ... generate the longest compile times.
>
>
>> To give you a better answer speak in complete sentences.
>>
>> Wolfgang
>>
>>

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Re: reducing compile time

[luigi scarso]

On Mon, Feb 23, 2009 at 9:26 PM, Alan Stone
<software.list.1es9s@gmail.com> wrote:
> On Mon, Feb 23, 2009 at 8:57 PM, Alan Stone <software.list.1es9s@gmail.com>
> wrote:
>>
>> On Mon, Feb 23, 2009 at 6:54 PM, Wolfgang Schuster
>> <schuster.wolfgang@googlemail.com> wrote:
>>>
>>> Am 23.02.2009 um 18:16 schrieb Alan Stone:
>>>
>>>> - does using \doifundefined{myMacro}{...} shorten tex runs/compile time
>>>> ?
>>>
>>> In which way?
>>
>> As I don't know/understand what happens between (Lua)TeX runs, to keep
>> macro definitions in memory.
>
>
> Correction: to avoid spending time redefining macros in case their
> definitions are kept in memory between Lua(TeX) runs.

$>context test.tex
is roughly
finish :=false
while not(finish):
  run_luatex_with_context_format_on_file(test.tex)

where
run_luatex_with_context_format_on_file(filename)
is my imaginary name that
run luatex (for example on my system
luatex --fmt="/opt/luatex/minimals/tex/texmf-cache/luatex-cache/context/4330c3ed7721ca11f9d108c60c58eea4/formats/cont-en"
--lua="/opt/luatex/minimals/tex/texmf-cache/luatex-cache/context/4330c3ed7721ca11f9d108c60c58eea4/formats/cont-en.lua"
"./test.tex"
)
but also check conditions to that change
finish to true
and possible write intermediate files.

So,as far I know, each run is a new process: there is no a master
process that spawns new children ,
and no definitions are kept in memory between Lua(TeX) runs.

-- 
luigi
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Re: reducing compile time

[Hans Hagen]

Alan Stone wrote:

> Correction: to avoid spending time redefining macros in case their
> definitions are kept in memory between Lua(TeX) runs.

i'm not sure what you mean, but defining a bunch of macros at runtime is 
not that time consuming

Hans


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Re: reducing compile time

[Wolfgang Schuster]

Am 23.02.2009 um 20:57 schrieb Alan Stone:

>> - does using \doifundefined{myMacro}{...} shorten tex runs/compile  
>> time ?
>>
>> In which way?
>
> As I don't know/understand what happens between (Lua)TeX runs, to  
> keep macro
> definitions in memory.

The only way to use information from a previous run is to use the  
auxiliary
files or buffers. Macros are defined at each run again but you  
shouldn't care
here about the performance unless you use a very big private module.

> - what are the features to avoid for shortest compile times ?
>>
>> Depends on your document and what do you want.
>
> My question was intended in a generic way, aka if you use
>
> - these features ... expect longer or significant longer compile  
> times, or
> - these features ... generate the longest compile times.

As Taco mentioned, try to avoid \switchtobodyfont and use \definedfont
or \definefont instead. You can also gain a few (micro)seconds when you
run TeX in batchmode (no terminal messages).

Natural Tables are quite slow and it's sometimes worth to take a look
if you can use table or tabulate.

Wolfgang

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Re: reducing compile time

[Taco Hoekwater]

Alan Stone wrote:
>  
> - what are the features to avoid for shortest compile times ?

Typesetting and macro expansion. Together they are good for
at least 90% of your running time :)

Seriously: it depends, but watch out for unnecessary use of
\switchtobodyfont.

Best wishes,
Taco
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Re: reducing compile time

[Mohamed Bana]

maybe someone should research LuaJIT; http://luajit.org/

lua vs luajit; 
http://shootout.alioth.debian.org/u32q/benchmark.php?test=all&lang=luajit&lang2=lua&box=1

thoughts?

Alan Stone wrote:
> - does using \doifundefined{myMacro}{...} shorten tex runs/compile time ?
>  
> - what are the features to avoid for shortest compile times ?
> 
> -- 
> Alan
> 
> 
> ------------------------------------------------------------------------
> 
> ___________________________________________________________________________________
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Re: reducing compile time

[Taco Hoekwater]

Mohamed Bana wrote:
> maybe someone should research LuaJIT; http://luajit.org/

The fine print on LuaJIT:

* Only x86 (i386+) CPUs are supported right now (but see below).

That is the first, main reason why luajit is not included in
luatex yet. The other reason is that we don't expect that much
improvement because most of the lua code inside luatex is not
running at full interpreter speed anyway: mkiv is spending much
of its time in creating tables and table keys and the garbage
collector (we benchmarked this) neither of those task will
benefit from luajit.

There would be some speed gain, but not a lot. I am waiting for
luajit 2.0 and hoping it will support more architectures.

Best wishes,
Taco

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Re: reducing compile time

[Hans Hagen]

Mohamed Bana wrote:
> maybe someone should research LuaJIT; http://luajit.org/
> 
> lua vs luajit; 
> http://shootout.alioth.debian.org/u32q/benchmark.php?test=all&lang=luajit&lang2=lua&box=1 
> 
> 
> thoughts?

i wonder if it makes much of a difference in the way we use lua; most 
time is currently spent on function calls and tex-lua interfacing and if 
i'm right jit does not help much there

long ago i did some tests and jut is indeed impressive but for larger 
functions (and we have many of them) you need to tune parameters in 
order to gain something

once luatex is finished we can look into it again but keep in mind that 
jit is only available for someplatforms/architectures

(btw i do lots if speed tests when writing lua code for mkiv, so often 
the code is already rather optimized)

Hans

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               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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Re: reducing compile time

[Hans Hagen]

Alan Stone wrote:
> - does using \doifundefined{myMacro}{...} shorten tex runs/compile time ?

not that much

> - what are the features to avoid for shortest compile times ?

most code is rather optimized

you can best avoid redundant font switches

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               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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                                              | www.pragma-pod.nl
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