[R] How to add make option to package compilation?

[Michael Dewey]

In line

On 15/09/2017 13:30, Martin Møller Skarbiniks Pedersen wrote:
> On 15 September 2017 at 14:13, Duncan Murdoch <murdoch.duncan at gmail.com>
> wrote:
> 
>> On 15/09/2017 8:11 AM, Martin Møller Skarbiniks Pedersen wrote:
>>
>>> Hi,
>>>
>>>     I am installing a lot of packages to a new R installation and it takes
>>> a
>>> long time.
>>>     However the machine got 4 cpus and most of the packages are written in
>>> C/C++.
>>>
>>>     So is it possible to add a -j4 flag to the make command when I use the
>>> install.packages() function?
>>>     That will probably speed up the package installation process 390%.
>>>
>>
>> See the Ncpus argument in ?install.packages.
> 
> 
> Thanks.
> 
> However it looks like Ncpus=4 tries to compile four R packages at the same
> time using one cpu for each packages.
> 

But you said you had lots to install so would that not speed things up too?

>  From the documentation:
> "
>     Ncpus: the number of parallel processes to use for a parallel
>            install of more than one source package.  Values greater than
>            one are supported if the ‘make’ command specified by
>            ‘Sys.getenv("MAKE", "make")’ accepts argument ‘-k -j Ncpus’
> "
> 
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> 
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-- 
Michael
http://www.dewey.myzen.co.uk/home.html