[R-pkg-devel] Unusually long execution time for R.utils::gzip on r-devel-windows
I can confirm that this has to fixed in R.utils. This gist is that
R.utils does lots of validation of read/write permissions, and deep
down it rely on system("dir") as a fallback method. If this is down
toward dirname(tempdir()), then it'll find a lot of files, e.g.
[1] " Datentr?ger in Laufwerk D: ist Daten"
[2] " Volumeseriennummer: 1826-A193"
[3] ""
[4] " Verzeichnis von D:\\temp"
[5] ""
[6] "17.02.2024 09:06 <DIR> ."
[7] "14.02.2024 03:36 0 cc6H4Sp5"
[8] "15.02.2024 03:46 0 cc6PwKb4"
[9] "15.02.2024 16:25 0 cc6RH27v"
[10] "16.02.2024 01:50 0 ccafzzMl"
...
[99997] "09.02.2024 04:48 <DIR> RtmpURWDbA"
[99998] "14.02.2024 04:35 <DIR> RtmpURWeVC"
[99999] "15.02.2024 04:00 <DIR> RtmpUrwhHU"
[ reached getOption("max.print") -- omitted 17165 entries ]
Time difference of 18.67841 secs
So, yeah, wow! I'll look into fixing this, probably by removing this
fallback approach, which is very rarely needed; it was added way back
when Sys.readlink() didn't cover all cases.
/Henrik
On Fri, Feb 16, 2024 at 9:24?PM Henrik Bengtsson
<henrik.bengtsson at gmail.com> wrote:
Author of R.utils here. I happen to investigate this too right now,
because of extremely slow win-builder performance of R.rsp checks,
which in turn depends on R.utils.
It's not obvious to me why this happens on win-builder. I've noticed
slower and slower win-builder/cran-incoming checks over the years,
despite the code not changing. Right now, I'm investigating a piece of
code that calls shell("dir") as a fallback to figure out if a file is
a symbol link or not - it could be that that takes a very long time on
win-builder.
So, stay tuned ... I'll report back when I find something out.
/Henrik
On Fri, Feb 16, 2024 at 4:43?PM Stefan Mayer
<stefan.mayer at uni-tuebingen.de> wrote:
Dear list, I tried to submit an update to my R package imagefluency, but the update does not pass the incoming checks automatically. The problem is that one of the examples takes too long to execute ? but only under Windows with the development version of R (R Under development (unstable) (2024-02-15 r85925 ucrt)). I was able to pin down the problem to using R.utils::gzip(). I created a test package that illustrates the problem: https://github.com/stm/ziptest The package has two functions that zip a file given a file path. When using R.utils::gzip() (function `gzipit()` in the test package), I get a NOTE when checking the package using devtools::check_win_devel() * checking examples ... [55s] NOTE Examples with CPU (user + system) or elapsed time > 10s user system elapsed gzipit 6.91 47.24 54.84 There is no issue with utils::zip() (function `zipit()` in the test package). Is this somehow a bug in R.utils::gzip(), or is there an issue with the combination of Windows and r-devel? Best, Stefan
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