On 15 September 2017 at 14:13, Duncan Murdoch <murdoch.dun...@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.
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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