[petsc-users] Error configuring with --download-ml and Intel MKL

[David Knezevic]

On Thu, Mar 26, 2015 at 4:21 PM, Matthew Knepley <knepley at gmail.com> wrote:

> On Thu, Mar 26, 2015 at 1:48 PM, David Knezevic <
> david.knezevic at akselos.com> wrote:
>
>> Hi all,
>>
>> I'm trying to configure PETSc using Intel's MKL and with --download-ml.
>> Here is my configure line:
>>
>> ./configure
>> --with-blas-lapack-dir=/opt/intel/composer_xe_2015/mkl/lib/intel64
>> --download-ml
>>
>> I get an error when ML does "checking for dgemm". The configure.log is
>> attached. I was wondering if anyone has any suggestions about how I can get
>> this to work?
>>
>
> We will need $PETSC_ARCH/externalpackages/ml-*/config.log to see where
> their test failed.
>


I've attached this file.




> However, MKL is almost never worth it.
>
>
OK, interesting, why not? The reason I'm using MKL in this case is because
I found that the direct solvers MUMPS and SuperLU were surprising slow on a
Haswell server. After rebuilding PETSc with MKL, these solvers were more
than 3x faster in some cases.

David
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