[R] inconsistency in mclapply.....

[akshay kulkarni]

Dear Ivan,
                 Yes, you were right....the native BLAS version of my ubuntu system is:

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.10.0
LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.10.0

Updating BLAS with ropenblas(), as you said,is superficial.

Will reverting back to you if stuck again....with mclapply..

A million thanks  again...

THanking you,
Yours sincerely,
AKSHAY M KULKKARNI
________________________________
From: Ivan Krylov <krylov.r00t using gmail.com>
Sent: Sunday, June 18, 2023 12:42 AM
To: akshay kulkarni <akshay_e4 using hotmail.com>
Cc: R help Mailing list <r-help using r-project.org>
Subject: Re: [R] inconsistency in mclapply.....

� Sat, 17 Jun 2023 18:54:43 +0000
akshay kulkarni <akshay_e4 using hotmail.com> �����:

>   1.  I was working on a two core machine just to test the
> code...tomorrow will be switching to a 48 core machine. Should I
> again download the latest openblas from ropenblas() or do you suggest
> testing the native openblas that is bundled in Ubuntu

What's the version of OpenBLAS in the Ubuntu release you are running?
Unless you can see significant improvements regarding your CPU
architecture appearing since the version included in Ubuntu was
released, there's little reason to install a different version
manually. The whole point of a GNU/Linux distro is not having to
compile everything yourself. Ubuntu's build of OpenBLAS contains
multiple copies of the code targeted at different processors, including
yours.

> 2.  How do you pass the version of openblas to be installed with
> ropenblas()? The full file name? or just something like this:
> libopenblas_skylakexp-r0.3.23.so  ?

It looks like this function accepts the names of git tags in the
official OpenBLAS Git repository, but it's really the job of the
package maintainer to document important arguments like this one
properly. You can call bug.report(package = 'ropenblas') or write an
e-mail to maintainer('ropenblas') or locate the author's GitHub and ask
a question there.

--
Best regards,
Ivan

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