Hi folks,
I'm working on re-submitting {greta} onto CRAN after it was archived last
year. I keep running into this NOTE:
```
Flavor: r-devel-linux-x86_64-debian-gcc
Check: re-building of vignette outputs, Result: NOTE
Re-building vignettes had CPU time 4.1 times elapsed time
```
Searching this email list, I understand this error means that our code is
using 2 or more cores. I am a bit confused how this is happening on CRAN,
as we mostly skip running of vignettes on CRAN as it involves installing
tensorflow and tensorflow probability. I have tried very hard to limit the
vignettes to only use 2 cores, by setting options like the following in the
vignette:
```{r setup, include = FALSE}
knitr::opts_chunk$set(echo = TRUE,
eval = greta:::check_tf_version("message"),
purl = greta:::check_tf_version("message"),
cache = TRUE,
comment = NA,
progress = FALSE)
# Force limit to 2 cores for CRAN
Sys.setenv("R_PARALLELLY_AVAILABLE_CORES" = "2")
Sys.setenv("MC_CORES" = "2")
Sys.setenv("OMP_THREAD_LIMIT" = "2")
Sys.setenv("OMP_NUM_THREADS" = "2")
options(mc.cores = 2)
# ...
```
This above approach does not seem to solve this problem. Searching more
generally, I see
https://contributor.r-project.org/cran-cookbook/code_issues.html#using-more-than-2-cores
and
I also note that I cannot reproduce the same error with:
```
rcmdcheck::rcmdcheck(args = c("--no-manual", "--as-cran",
"--no-multiarch"), env =
"_R_CHECK_VIGNETTE_TIMING_CPU_TO_ELAPSED_THRESHOLD_ = 53")
```
I'm wondering if there is something I am missing on how to deal with this
vignette building NOTE, or if I should if ask CRAN can ignore this NOTE?
Best,
Nick
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