[Omake] scanning of .mly files

[Benjamin Pierce]

Cool -- I had forgotten about -j -- now I can totally saturate all  
the processors on my MacBook!

     :-)

On Jun 12, 2006, at 3:20 PM, Aleksey Nogin wrote:

> On 12.06.2006 10:33, Jason Hickey wrote:
>
>>> My reading of OCaml.om is that this will *not* happen  
>>> automatically  -- arguably it should.  But in any case, it seems  
>>> strange that the  resulting behavior should differ from one  
>>> machine to another.  Is  there some way we can cause OMake to  
>>> dump enough information to see  what the difference might be?
>> Hmm, I'm not sure if you are using -k or such.  The build order is  
>> "nondetermistic".  Basically, the leaves of the build tree define  
>> a "ready-queue" of targets that can be built, and their order in  
>> the ready-queue is arbitrary.  However, if you are not using -k,  
>> and you start from a fresh tree, it _should_ be deterministic.
>
> Actually, the "-j nn" option would also make things highly  
> nondeterministic, expecially if some critical dependencies are  
> missing.
>
>> As far as debugging a lack of dependencies, it is hard:(  Erick, I  
>> believe, was suggesting that we monitor the filesystem and verify  
>> that file accesses conform to the dependency order.
>
> While what Jason said is true, detecting missing dependencies is in  
> my experience a bit easier if you routinely use the "-j nn" option.  
> Which, BTW, I would highly recommend in general, Even on a  
> uniprocessor "-j 2"/"-j 3" is likely to speed up the build,  
> especially if the filesystem is relatively slow (e.g. NFS).
>
> From my ~/.login (tcsh syntax):
>
>    setenv OMAKEFLAGS "-p -j5"
>    if ( -r /proc/cpuinfo ) then
>       set procs = `cat /proc/cpuinfo | grep '^processor'|wc -l`
>       if ( $procs > 1 ) setenv MAKEFLAGS "-j`expr $procs + 1`"
>       setenv OMAKEFLAGS "$OMAKEFLAGS -j`expr $procs \* 5`"
>       unset procs
>    endif
>
> -- 
> Aleksey Nogin
>
> Home Page: http://nogin.org/
> E-Mail: nogin at cs.caltech.edu (office), aleksey at nogin.org (personal)
> Office: Moore 04, tel: (626) 395-2200
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