В Tue, 14 Jan 2025 14:23:54 +0000 "Huseni, Sadamhusen" <sadamhusen.hus...@genpact.com> пишет:
> ###***Session information from Linux version 8 > R version 4.4.1 (2024-06-14) > Platform: x86_64-redhat-linux-gnu > Running under: Red Hat Enterprise Linux 8.10 (Ootpa) > > Matrix products: default > BLAS/LAPACK: /usr/lib64/libopenblaso-r0.3.15.so; LAPACK version 3.9.0 > ###***Session information from Linux version 7 > > R version 3.6.0 (2019-04-26) > Platform: x86_64-redhat-linux-gnu (64-bit) > Running under: Red Hat Enterprise Linux > > Matrix products: default > BLAS/LAPACK: /usr/lib64/R/lib/libRblas.so On RHEL 7, R was using the reference BLAS (linear algebra library). On RHEL 8, R is using OpenBLAS compiled with OpenMP support. It is probably creating its own threads, one per CPU, in every child process, which gives you N^2 processes contending for N CPUs. Try running your script with the environment variable OPENBLAS_NUM_THREADS set to the string "1". It might be possible to speed up the script by setting OPENBLAS_NUM_THREADS=2 and dividing the number of child processes by the same number. -- Best regards, Ivan ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide https://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
