В Tue, 21 May 2024 08:00:11 +0000 Dario Strbenac via R-devel <r-devel@r-project.org> пишет:
> Would a less resource-intensive value, such as 1, be a safer default > CPU value for confint? Which confint() method do you have in mind? There is at least four of them by default in R, and many additional classes could make use of stats:::confint.default by implementing vcov(). > Also, there is no mention of such parallel processing in ?confint, so > it was not clear at first where to look for performance degradation. > It could at least be described in the manual page so that users would > know that export OPENBLAS_NUM_THREADS=1 is a solution. There isn't much R can do about the behaviour of the BLAS, because there is no standard interface to set the number of threads. Some BLASes (like ATLAS) don't even offer it as a tunable number at all [*]. A system administrator could link the installation of R against FlexiBLAS [**], provide safe defaults in the environment variables and educate the users about its tunables [***], but that's a choice just like it had been a choice to link R against a parallel variant of OpenBLAS on a shared computer. This is described in R Installation and Administration, section A.3.1 [****]. -- Best regards, Ivan [*] https://math-atlas.sourceforge.net/faq.html#tnum [**] https://www.mpi-magdeburg.mpg.de/projects/flexiblas [***] https://search.r-project.org/CRAN/refmans/flexiblas/html/flexiblas-threads.html [****] https://cran.r-project.org/doc/manuals/R-admin.html#BLAS ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
