[R-pkg-devel] Searching examples in source code

[Greg Hunt]

Indeed, and since this is a database client, the question is not just the
elapsed time of the client code, but the optimisation opportunities need to
be viewed as a proportion of the overall request time: client time, network
time, typical and minimum database server time.

On Mon, 9 May 2022 at 05:24, Joshua Ulrich <josh.m.ulrich using gmail.com> wrote:

> Hi Ben,
>
> On Sat, May 7, 2022 at 4:24 PM Ben Engbers <Ben.Engbers using be-logical.nl>
> wrote:
> >
> > Hi,
> >
> > My package (RBaseX) is written entirely in R. The performance is not bad
> > but to further improve the performance I want to investigate to what
> > extent use of C++ makes sense. Problem is that I have little experience
> > with C++ and none with Rcpp. So I am looking for examples.
> > On my (linux) system I installed several packages that needed to be
> > compiled. So it is likely that I already have examples on my system.
> >
> I strongly recommend you profile your code to determine where there
> are performance bottlenecks before writing any new code. Especially
> before adding compiled code to your package.
>
> The infamous Knuth quote:
> "We should forget about small efficiencies, say about 97% of the time:
> premature optimization is the root of all evil. Yet we should not pass
> up our opportunities in that critical 3%. A good programmer will not
> be lulled into complacency by such reasoning, he will be wise to look
> carefully at the critical code; but only after that code has been
> identified."
>
> Best,
> Josh
>
> > My first question is if there is a useful linux command to search all
> > the source code of installed packages on my system.
> > The second question is if there is a command to search all packages at
> > https://cran.r-project.org/web/packages/available_packages_by_name.html?
> >
> > This question is not only relevant to C++ examples. It would also be
> > nice if you could search for occurrences of commands in R code.
> >
> > Ben
> >
> > ______________________________________________
> > R-package-devel using r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-package-devel
>
>
>
> --
> Joshua Ulrich  |  about.me/joshuaulrich
> FOSS Trading  |  www.fosstrading.com
>
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