[R-pkg-devel] Re-building vignettes had CPU time 9.2 times elapsed time

[Toby Hocking]

Thanks Dirk. I agree.
data.table is not in a situation to update very soon, so the easiest
solution for the R community would be for CRAN to set OMP_THREAD_LIMIT
to 2 on the Windows and Debian machines doing this test.
Otherwise the 1400+ packages with hard dependencies on data.table will
each have to implement custom logic to limit threads to 2.
Toby

On Fri, Aug 25, 2023 at 6:46 AM Dirk Eddelbuettel <edd using debian.org> wrote:
>
>
> On 24 August 2023 at 07:42, Fred Viole wrote:
> | Hi, I am receiving a NOTE upon submission regarding the re-building of
> | vignettes for CPU time for the Debian check.
> |
> | I am unable to find any documented instances or solutions to this issue.
> | The vignettes currently build in 1m 54.3s locally and in 56s on the Win
> | check.
> |
> | https://win-builder.r-project.org/incoming_pretest/NNS_10.1_20230824_132459/Debian/00check.log
>
> Please see, inter alia, the long running thread
>
>    "Trouble with long-running tests on CRAN debian server"
>
> started earlier this week (!!) on this list covering exactly this issue.
>
> We can only hope CRAN comes to understand our point that _it_ should set a
> clearly-identifable variable (the OpenMP thread count would do) so that
> package data.table can this for its several hundred users.
>
> As things currently stand, CRAN expects several hundred packages (such as
> your, guessing there this comes from data.table which I do not know for sure
> but you do import it) to make the change which is pretty close to the text
> book definition of madness.
>
> Also see https://github.com/Rdatatable/data.table/issues/5658 with by now 24
> comments.  It is on the same issue.
>
> Uwe, Kurt: Please please please set OMP_THREAD_LIMIT to 2 on the Windows and
> Debian machines doing this test.
>
> Dirk
>
> --
> dirk.eddelbuettel.com | @eddelbuettel | edd using debian.org
>
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