[Rd] parallel build for package? (equivalent of make -j8)

Uwe Ligges ligges at statistik.tu-dortmund.de
Mon Dec 1 12:01:55 CET 2008

Prof Brian Ripley wrote:
> On Mon, 1 Dec 2008, Uwe Ligges wrote:
>> Peter Dalgaard wrote:
>>> Whit Armstrong wrote:
>>>> I have a package that takes about 20 minutes to compile which tends to
>>>> prolong the compile/test/compile cycle.
>>>> Does anyone know how to get R CMD check or R CMD INSTALL to use 
>>>> parallel make?
>>>> I looked at R CMD INSTALL --help, but I don't see anything obvious
>>>> arguments to do this.
>>> Platform?
>>> Does
>>> MAKE="make -j8" R CMD INSTALL ...
>>> not work?
>> I cannot believe this works safely, at least when installing into the 
>> same library, because of R's lock mechanism that locks a library if 
>> *one* installation is running ...
> It does say 'package' (singular).

Good point, I thought we were talking about parallelizing many packages' 
installations. One should read the original question more carefully 
rather than starting from a response.....
My apologies for the nonsense - and you all know fortune("talking 
nonsense") anyway:

Uwe Ligges: I just told nonsense, stepclass() does not make sense with 
randomForest(), obviously ... (wonder why nobody shouted?).
Douglas Bates: Oh, we're just so used to you talking nonsense that we 
don't bother to point it out any more :-)
    -- Uwe Ligges and Douglas Bates
       R-help (July 2005)


 > It you know what you are doing you
> can switch off the locking (and you also need to worry about installing 
> dependencies in the right order, at least for source installs).
> I don't see the issue though: if you run R CMD INSTALL on a package 
> directory (rather than a tarball), 'make' will only re-make the compiled 
> code whose sources have changed.  Or is 'compile' being used loosely for 
> 'install' (and even so it is rare for the bits that are always done, 
> e.g. dumping R code, to take long).
>> Best,
>> Uwe
>>> (Beware: Here there be Tygers. Parallel makes have their surprises....)
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