[R-pkg-devel] Checking the number of cores used

[Uwe Ligges]

On 18.09.2023 16:10, Shu Fai Cheung wrote:
> Hi All,
> 
> I know we should not use more than 2 cores in tests, vignettes, etc. I
> encountered and solved this issue before. However, I still committed
> this mistake in a new package and would like find out where the cause
> is.
> 
> I have a package that already has parallel processing disabled by
> default and I did not enable parallel processing in the examples and
> tests (except for one test, which is always skipped by skip()).
> However, I was told that somewhere in the package more than 2 cores
> are used.
> 
> I checked several times and even added a temporary 'stop()` to "trap"
> parallel processing but still could not find where the source of the
> problem is.
> 
> I checked the timing in the log in R CMD check results from winbuilder
> but everything seems OK. The user time and elapsed time are similar
> for all the examples.
> 
> Is there any quick way to check where things go wrong regarding the
> number of cores? It is not easy to find the source of the problems
> when there are many examples and tests.

If it is OK on winbuilder but not on Linux, then likely something makes 
use of multithreading.

Best,
Uwe Ligges



> Regards,
> Shu Fai
> 
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