On 09/15/2017 08:57 AM, Michael Dewey wrote:
In line
On 15/09/2017 13:30, Martin Møller Skarbiniks Pedersen wrote:
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.
The variable MAKE is defined in ${R_HOME}/etc/Renviron, and can be
over-written with ~/.Renviron
MAKE=make -j
There is further discussion in
https://cran.r-project.org/doc/manuals/r-release/R-admin.html#Configuration-variables
and ?Renviron.
One could configure a source installation to always compile with make
-j, something like ./configure MAKE="make -j"
Martin
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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