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Markus Dittrich wrote: |
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> On Tue, 10 Jul 2007, Adam Pityszek wrote: |
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>> Hi All, |
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> |
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>> I am forwarding my email to Sebastien regarding the merging of blas- and |
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>> cblas-reference into one package. Sebastien accepted this idea, but we |
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>> would like to hear your opinions as well, since you are the real users |
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>> of scientific libraries in Gentoo. |
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> |
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>> BR, |
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>> /Adam |
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> |
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> |
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> This sounds like a fine plan to me, particularly since most |
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> blas implementations in portage do provide both blas and cblas |
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> at the same time. In addition, this would render the eselect framework |
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> less complicated which I find desirable. |
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> |
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> cheers, |
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> Markus |
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> |
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> |
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> -- Markus Dittrich (markusle) |
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> Gentoo Linux Developer |
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> Scientific applications |
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|
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I think the general scenario for users of BLAS and LAPACK is that they |
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will be happy with this. However, some people, especially in the |
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high-performance area, will want to be able to benchmark various |
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versions (ATLAS, GOTO or chip-specific Intel/AMD) and either static-link |
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to the winner or dynamic-link to the winner on an individual calling |
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application basis. |
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|
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I haven't gotten around to doing that yet, but it's on my list for my |
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AMD64 dual-core system. I'm not sure the "eselect" facility provides for |
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this. And a number of packages carry their own BLAS or LAPACK. R is one |
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of them; in fact |
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|
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1. R allows you to build a shared library of the BLAS and LAPACK that it |
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carries, and |
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2. The R team strongly suggests using the LAPACK that R carries rather |
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than an external one, and indeed, the "make check-all" tests fail on |
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some architectures with some external versions of LAPACK. On my Athlon |
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T-Bird, this happened with the Gentoo lapack-atlas and the R team |
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slapped me silly when I complained about it on their mailing list. ;) |
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|
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So as long as I can do all of these things: |
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|
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1. Choose between static and dynamic linking to BLAS/LAPACK with a USE |
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flag on any application that allows such a choice, |
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2. Choose between internal BLAS/LAPACK with a USE flag on any |
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application that allows such a choice, and |
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3. Choose between the various versions for the highest performance on an |
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individual application basis |
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|
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I'm happy. I think most of the ebuilds are already set up this way, but |
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again, I haven't had a chance to test with really big problems on my |
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really big machine yet. |
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-- |
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