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Re: Another, very important note on PC GAMESS/Firefly running on Core i7/Xeon 5500/Xeon 3500 (Nehalem core) processors

Alex Granovsky
gran@classic.chem.msu.su


Dear Firefly users,

The updated p4stuff.dll/p4stuff.ex files are available for download in the Downloads section.

This version fixes the nasty Core i7 MKL's dgemm bug (our big thanks to Intel's MKL team) I described in the earlier post.

Regards,
Alex Granovsky

On Thu May 21 '09 9:23pm, Alex Granovsky wrote
----------------------------------------------
>Dear Firefly users,

>the p4stuff.dll/p4stuff.ex dynamic/shared library which can be
>optionally used by the PC GAMESS/Firefly contains several
>32-bit matrix multiplication routines (dgemm) taken from Intel's MKL.

>Several days ago we found two critical bugs in Intel's
>implementation of 32-bit dgemm routines which are used on
>Penryn and Nehalem-core processors. The bugs manifest themself
>only for large matrices and thus are "hidden".

>These bugs can potentially affect PC GAMESS/Firefly using
>its default settings and running on Nehalem-core processors
>under 32-bit Windows, under 32-bit or 64-bit Linux, and Mac OS X.

>The solution is to disable use of externally stored dgemm
>running Firefly on Nehalem core processors:

>

 $smp call64=1 load=0 $end

>We are working with Intel and hope to provide the replacement
>p4stuff library based on the fixed MKL code within a couple of weeks.

>Regards,
>Alex Granovsky
>
>
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[ This message was edited on Mon Jun 8 '09 at 9:22pm by the author ]


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