It is possible to compile, say mgcv with OpenMP. There are several steps (done on a Mac M4 with Sequoia 15.3.2) :
- Installed R 4.5.0 patched (should not change from the initial 4.5.0 version, but to be correct) - Installed the compilation tools with `xcode-select —install` - Installed gfortran-14.2-universal.pkg from here: https://mac.r-project.org/tools/ - Followed instructions here: https://mac.r-project.org/bin/, that is, `sudo R`, then `source("https://mac.R-project.org/bin/install.R »)`, then ```bash install.libs("r-base-dev") install.libs("gettext") ``` - Followed instructions on this page to get experimental OpenMP libraries: https://mac.r-project.org/openmp/ - Downloaded the latest .tar.gz source of mgcv and placed the file in the current directory - Recompiled mgcv with: `PKG_CPPFLAGS='-Xclang -fopenmp' PKG_LIBS=-lomp R CMD INSTALL mgcv-1.9-3.tar.gz` Now I have `mgcv:::mgcv.omp()` that returns TRUE. Note that I used to recompile data.table also to get a multithreaded version, but apparently, it is not needed any more: ```R install.packages("data.table") library(data.table) getDTthreads() # 8 for me by default (M4 max) packageVersion("data.table") # 1.17.0 ``` It would be nice to get multithreading, and especially OpenMP, enabled by default for the Mac. But I understand that it is risky since Apple does not support it officially. Best, Philippe .........................................<°}))><........ ) ) ) ) ) ( ( ( ( ( Prof. Philippe Grosjean ) ) ) ) ) ( ( ( ( ( Numerical Ecology ) ) ) ) ) Mons University, Belgium ( ( ( ( ( .............................................................. > Le 24 avr. 2025 à 11:58, Gavin Simpson <ucfa...@gmail.com> a écrit : > > Dear list, > > I'm trying to clarify my understanding of what is and is not > implemented / expected in terms of openMP support in R and CRAN > package *binaries* for MacOS on apple silicon. > > I have the CRAN's R binary for MacOS X (apple silicon) and also the > CRAN binaries for two packages, glmmTMB and mgcv, both of which seem > to be instrumented (following WRE) to use OpenMP if available. And > from discussions here I understand that thanks to Simon and others, > OpenMP support for MacOS X is in R and so should I expect OpenMP to > work in these two packages? > > If I am, neither of them is working on various of my Mac systems; > model fitting is single threaded and the test functions that glmmTMB > and mgcv use to detect OMP support both return FALSE: > > R version 4.5.0 (2025-04-11) -- "How About a Twenty-Six" > Platform: aarch64-apple-darwin20 (64-bit) > r$> glmmTMB::omp_check() > [1] FALSE > r$> mgcv:::mgcv.omp() > [1] FALSE > > Is this reproducible on other's systems? (Could someone run those two > bits of code on their systems if they use the MacOS X R binary from > CRAN and the CRAN Mac binaries for the packages - running mgcv's test > should be easier as this pkg is shipped with the R binary). > > I am happy to provide further system details, but at this point I'm > mostly hoping to clarify what I should expect and whether what I'm > seeing is typical? > > Thanks in advance > > Gavin > > -- > Gavin Simpson, PhD [he/him/his] > [tw] @ucfagls [OrciD] 0000-0002-9084-8413 > [web] fromthebottomoftheheap.net > • Assistant Professor > • Department of Animal & Veterinary Sciences, Aarhus University > • Adjunct Professor, Department of Biology, University of Regina. > > _______________________________________________ > R-SIG-Mac mailing list > R-SIG-Mac@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-mac _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-mac
