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</div><div dir="ltr">morning z you no upk emA<br>
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</div><div dir="ltr">Sent from my <a href="tel:2014818">2014818</a></div><div class="wps_quotion">On Kasper Daniel Hansen <kasperdanielhansen@gmail.com>, Sep 9, 2018 8:23 PM wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p></p><p dir="ltr">Thanks for the extremely helpful pointers on this. Clearly I need to
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remove --with-lapack in my configure step.
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On Sun, Sep 9, 2018 at 4:12 AM Prof Brian Ripley <<a href="mailto:ripley@stats.ox.ac.uk">ripley@stats.ox.ac.uk</a>>
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wrote:
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> On 08/09/2018 22:01, Kasper Daniel Hansen wrote:
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> > For timing purposes, is it possible to control the number of threads /
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> > cores when I have compiled R to use the BLAS in the Accelerate framework
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> > (by building R using
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> > ./configure --with-blas="-framework Accelerate" --with-lapack
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> > )
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> >
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> > ? (The alternative is of course to build R using the supplied
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> > single-threaded BLAS)
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>
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> This is a question about Accelerate not R. But the R-admin manual does say
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>
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> 'In recent versions of macOS, threading in Accelerate is controlled by
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> ‘Grand Central Dispatch’ and is said not to need user control.'
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>
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> It has quite a few other caveats about Accelerate, not least that it
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> uses an LAPACK which is missing many bug fixes, some serious.
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>
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> --
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> Brian D. Ripley, <a href="mailto:ripley@stats.ox.ac.uk">ripley@stats.ox.ac.uk</a>
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> Emeritus Professor of Applied Statistics, University of Oxford
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>
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