Hi all, I've compiled R (version 2.8.1) from the source code with "--with- blas=" option in order to use external multi-threaded blas package. However, it's very hard to verify that compilation is correct and R is using multi-threads correctly or not. Which command or operation in R will run with multi-threads?
I assumed that matrix multiplication %*% may call multi-threaded blas operation. So, I run the following code: n <- 2000 T = matrix(runif(n*n), nrow=n, ncol=n) system.time(T %*% T) and watch R process by using unix top command with show-all-threads option. However, it seems like my R doesn't use multi-threads but just run with single thread. Is there any other command that I can use to verify multi-threads use? Regarding the with-blas option, I have tried to use either atlas or gotoblas with the following configure option: --with-blas="-lptf77blas -lpthread -latlas" --with-blas="-lgotocblas -lgotoblas -lpthread" Not sure if my options are correct or not. Thank you for your and comment or advice in advance. Thanks, Jong ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
