[Trilinos-Users] How to get lapack/blas library consistency?

[Buermann, Lee R]

This is an issue you and I have ran into before, Kurtis.  I'm not positive what is writing (configuring) TrilinosConfig.cmake, however it appears to me that whatever is configuring that file, is finding the files at the location its writing, but when compiling Trilinos (or possibly even each individual package) finds it somewhere else. I could dig in and figure out where TrilinosConfig.cmake is being configured, but I think it might be difficult (at least for me) to find why there is this inconsistency.

Lee

From: Kurtis Nusbaum [mailto:klnusbaum at gmail.com]
Sent: Wednesday, July 07, 2010 11:27 AM
To: Buermann, Lee R
Cc: John R Cary; Trilinos Users
Subject: Re: [Trilinos-Users] How to get lapack/blas library consistency?

But why does TrilinosConfig.cmake not correctly indicate which Libraries are actually being used when compiled? That's really the deeper issue that needs to be fixed.

-Kurtis
On Wed, Jul 7, 2010 at 10:22 AM, Buermann, Lee R <LRBUERMANN at csbsju.edu<mailto:LRBUERMANN at csbsju.edu>> wrote:
If what your building is using CMake, you should be able to write a Find Script for LAPACK. Trilinos has one in "yourTrilinosSource/cmake/TPLs/FindTPLLAPACK.cmake" I would think that if you use the same script as Trilinos, you would find the same libraries as Trilinos.

Lee

From: Kurtis Nusbaum [mailto:klnusbaum at gmail.com<mailto:klnusbaum at gmail.com>]
Sent: Wednesday, July 07, 2010 11:07 AM
To: John R Cary; Buermann, Lee R
Cc: Trilinos Users
Subject: Re: [Trilinos-Users] How to get lapack/blas library consistency?

Lee Buermann has actually been doing some work with the way Trilinos detects LAPACK. He might be able to speak to this issue. Lee, any thoughts?

-Kurtis
On Wed, Jul 7, 2010 at 9:51 AM, John R Cary <cary at colorado.edu<mailto:cary at colorado.edu>> wrote:

When we build something with Trilinos, we want (I assume)
to ensure that we use the same lapack libs that Trilinos
uses.  Is there a way to detect this?

I see:

iter.cary$ grep -i lapack TrilinosConfig.cmake
SET(Trilinos_TPL_LIBRARIES "/usr/lib64/liblapack.so;/usr/lib64/libblas.so")
SET(Trilinos_TPL_LIST "LAPACK;BLAS")

which makes me this that those were used, but then I
see:

iter.cary$ ldd lib/libifpack.so | egrep '(lapack|blas|atlas)'
       liblapack.so.3 => /usr/lib64/atlas/liblapack.so.3 (0x00007f61d5999000)
       libblas.so.3 => /usr/lib64/libblas.so.3 (0x00007f61d5743000)
       libf77blas.so.3 => /usr/lib64/atlas/libf77blas.so.3 (0x00007f61d471f000)
       libcblas.so.3 => /usr/lib64/atlas/libcblas.so.3 (0x00007f61d44fe000)
       libatlas.so.3 => /usr/lib64/atlas/libatlas.so.3 (0x00007f61d3c44000)

which seems to indicate that Trilinos chose not to use
the specified libs, but chose to use atlas and the
system blas instead.

I need a strategy that works for static builds, so cannot
use ldd to detect.

Thanks....John

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