[petsc-users] odd behavior when using lapack's dgeev with petsc

[Barry Smith]

> On Apr 7, 2017, at 1:46 PM, Manav Bhatia <bhatiamanav at gmail.com> wrote:
> 
> Hi, 
>  
>    I have compile petsc on my Ubuntu machine (also Mac OS 10.12 separately) to link to the system lapack and blas libraries (shown below). 
> 
>    I have created an interface class to dgeev in lapack to calculate the eigenvalues of a matrix. 
> 
>    My application code links to multiple libraries: libMesh, petsc, slepc, hdf5, etc. 
> 
>    If I test my interface inside this application code, I get junk results. 

   This is easy to debug because you have a version that works.

   Run both versions in separate windows each in a debugger and put a break point in the dgeev_ function. When it gets there check that it is the same dgeev_ function in both cases and check that the inputs are the same then step through both to see when things start to change between the two.

> 
>    However, on the same machine, if I use the interface in a separate main() function without linking to any of the libraries except lapack and blas, then I get expected results. 
> 
>    Also, this problem does not show up on Mac. 
> 
>    I am not sure what could be causing this and don’t quite know where to start. Could Petsc have anything to do with this? 
> 
>    Any insight would be greatly appreciated. 
> 
> Regards,
> Manav
> 
> manav at manav1:~/test$ ldd /opt/local/lib/libpetsc.so
> 	linux-vdso.so.1 =>  (0x00007fff3e7a8000)
> 	libsuperlu_dist.so.5 => /opt/local/lib/libsuperlu_dist.so.5 (0x00007f721fbd1000)
> 	libparmetis.so => /opt/local/lib/libparmetis.so (0x00007f721f990000)
> 	libmetis.so => /opt/local/lib/libmetis.so (0x00007f721f718000)
> 	libsuperlu.so.5 => /opt/local/lib/libsuperlu.so.5 (0x00007f721f4a7000)
> 	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f721f124000)
> 	liblapack.so.3 => /usr/lib/liblapack.so.3 (0x00007f721e92c000)
> 	libblas.so.3 => /usr/lib/libblas.so.3 (0x00007f721e6bd000)
> 	libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f721e382000)
> 	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f721e079000)
> 	libmpi_mpifh.so.12 => /usr/lib/libmpi_mpifh.so.12 (0x00007f721de20000)
> 	libgfortran.so.3 => /usr/lib/x86_64-linux-gnu/libgfortran.so.3 (0x00007f721daf4000)
> 	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f721d8f0000)
> 	libmpi.so.12 => /usr/lib/libmpi.so.12 (0x00007f721d61a000)
> 	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f721d403000)
> 	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f721d1e6000)
> 	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f721ce1d000)
> 	/lib64/ld-linux-x86-64.so.2 (0x000055d739f1b000)
> 	libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f721cbcf000)
> 	libopen-pal.so.13 => /usr/lib/libopen-pal.so.13 (0x00007f721c932000)
> 	libquadmath.so.0 => /usr/lib/x86_64-linux-gnu/libquadmath.so.0 (0x00007f721c6f2000)
> 	libibverbs.so.1 => /usr/lib/libibverbs.so.1 (0x00007f721c4e3000)
> 	libopen-rte.so.12 => /usr/lib/libopen-rte.so.12 (0x00007f721c269000)
> 	libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f721c064000)
> 	libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f721be5e000)
> 	librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f721bc56000)
> 	libutil.so.1 => /lib/x86_64-linux-gnu/libutil.so.1 (0x00007f721ba52000)
> 	libhwloc.so.5 => /usr/lib/x86_64-linux-gnu/libhwloc.so.5 (0x00007f721b818000)
> 	libnuma.so.1 => /usr/lib/x86_64-linux-gnu/libnuma.so.1 (0x00007f721b60c000)
> 	libltdl.so.7 => /usr/lib/x86_64-linux-gnu/libltdl.so.7 (0x00007f721b402000)
>