Hmm...I don't think so. The function I'm talking about loops over a file many times and does a lot of 'seeks'. I think just implementing the loop in C makes it faster. And besides, I see the speedup on Linux, which doesn't have the problem you mention.
-roger On Thu, Jul 31, 2008 at 10:53 AM, Henrik Bengtsson <[EMAIL PROTECTED]> wrote: > Hi, > > On Thu, Jul 31, 2008 at 6:35 AM, Roger D. Peng <[EMAIL PROTECTED]> wrote: >> Are the functions 'R_Unserialize' and 'R_InitFileInPStream' allowed to >> be used in R packages? I guess I'm just not clear on the implications >> of this comment in 'Rinternals.h': >> >> /* The connection interface is not yet available to packages. To >> allow limited use of connection pointers this defines the opaque >> pointer type. */ >> >> I have a function in the 'filehash' package that unserializes a bunch >> of objects from a file and it seems to run much faster in C than in R. >> But I don't want to release something that uses a non-public >> function/interface. > > You say "much faster". Could this be related to what I recently observed: > > July 24, 2008 thread '[Rd] serialize() to via temporary file is heaps > faster than doing it directly (on Windows)' [ > https://stat.ethz.ch/pipermail/r-devel/2008-July/050256.html ]. > > My $0.02 > > /Henrik > > >> >> Thanks, >> -roger >> -- >> Roger D. Peng | http://www.biostat.jhsph.edu/~rpeng/ >> >> ______________________________________________ >> 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 > -- Roger D. Peng | http://www.biostat.jhsph.edu/~rpeng/ ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
