Unfortunately that seems to be (almost) just as slow. ~$ time Rscript -e 'Matrix::summary; ls()' > /dev/null real 0m2.785s user 0m2.668s sys 0m0.112s
Gabor On Tue, Oct 29, 2013 at 10:11 AM, Prof Brian Ripley <rip...@stats.ox.ac.uk> wrote: > On 29/10/2013 14:03, Gábor Csárdi wrote: >> >> Dear All, >> >> before its latest version my package had 'Imports: Matrix' in its >> DESCRIPTION file, but it did not import anything in NAMESPACE. Rather, >> some functions explicitly loaded Matrix, as they needed. The reason >> for this was that importing Matrix is really slow, and only very few >> igraph functions need it. (I guess Matrix is slow because of the many >> registered names, but that is another question.) >> >> # Empty session: >> ~$ time Rscript -e 'ls()' > /dev/null >> real 0m0.251s >> user 0m0.196s >> sys 0m0.049s >> >> # Without importing from Matrix: >> ~$ time Rscript -e 'library(igraph); ls()' > /dev/null >> Loading required package: methods >> real 0m0.419s >> user 0m0.363s >> sys 0m0.049s >> >> # Adding importFrom(Matrix, sparseMatrix) to NAMESPACE: >> ~$ time Rscript -e 'library(igraph); ls()' > /dev/null >> Loading required package: methods >> real 0m2.963s >> user 0m2.844s >> sys 0m0.115s >> >> This solution was fine with me, especially because other packages >> depending on igraph and using Matrix through igraph worked fine on the >> CRAN build servers, as igraph brought Matrix with it. (The build >> servers don't have recommended packages like Matrix available by >> default.) >> >> Recently, R CMD check does not allow me to list Matrix at Imports >> without importing something from it. This is understandable, because >> it is an inconsistency after all, but caused some headache for me. >> >> A 3s loading time for a package is IMHO much longer than ideal, >> especially that loading R itself is ten times faster. So I definitely >> don't want to import from Matrix right now. >> >> The solution I settled with was to include Matrix in 'Suggests', and >> the load it selectively, as before. Now some packages depending on >> igraph are failing on the CRAN build servers, which don't have Matrix >> installed for these packages. (Luckily they are probably not failing >> for users, because most users do have the recommended packages.) >> >> In summary, it would be great to speed up imports. >> >> Another solution would be some mechanism that allows me to import from >> a package as needed, not at the package loading time. Something like a >> delayed importFrom(). > > > That is what Matrix:: does. There is nothing like enough here for us to > tell why it would not suffice for you. (If you want to import something > occasionally and then use it very many times, make a local copy.) > >> >> Just wanted to bring up this issue. >> >> Best, >> Gabor >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel >> > > > -- > Brian D. Ripley, rip...@stats.ox.ac.uk > Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ > University of Oxford, Tel: +44 1865 272861 (self) > 1 South Parks Road, +44 1865 272866 (PA) > Oxford OX1 3TG, UK Fax: +44 1865 272595 > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
