AMD vs Intel (MKL.DLL vs ACML.DLL) and BLAS.SPEC help

Currently running a trial of Matlab on Windows with four AMD Opteron 6272 processors, 64 core / 64GB RAM. Bench (and other testing) shows it's SLOWER versus a six core Intel (single socket) install! Reading various resources online it has been suggested I should try using the AMD Core Math Library (ACML.DLL) vs the Intel Math Kernel Library (MKL.DLL).

How do I go about installing the ACML.DLL? I have found various links on the AMD website but it's unclear on how to go about it. I've tried a few packages (from AMD) but none of them have a file called ACML.DLL). Did mathworks ever ship such a file with Matlab installs?

I can see I need to update the file BLAS.SPEC such that AuthenticAMD processors point to the appropriate library (currently pointing to MKL.DLL). I just don't know how to find the appropriate ACML.DLL - I am running R2012a for this test. thank you

[vinvaite]

It looks like i am suffering from Intels AMD Cripple code int he Intel MKL?

http://www.agner.org/optimize/blog/read.php?i=49#49 http://www.ftc.gov/opa/2010/08/intel.shtm

Has anyone run into these problem with AMD processors? Is there a way perhaps to upgrade MKL or use ACML? Apparently "MATLAB currently does not work very well with the ACML library" i am so told. So pretty stuck with some new hardware that doesn;t work with matlab atm. :(

[Walter Roberson]

Thanks for digging up those pages; I had not heard that before.

[vinvaite]

Anyone have an opinion on the best way to progress this. AMD is apparently supported by Matlab yet i am only seeing approximately 50% the performance expected (using an AMD machine). Very frustrating!

[Ravikumar R]

I recently had a simpler issues on AMD based Dell server with Nastran application. The root cause was the server's power management policy.

To resolve the performance Issue, Set the following things on the BIOS & try.

Power Management --> Maxinmum Performance

HPC Mode --> Enabled

C1E --> Disabled