DBD test failure: 32-bit LAPACK 3.7.0/Netlib BLAS 3.7.0

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DBD test failure: 32-bit LAPACK 3.7.0/Netlib BLAS 3.7.0

Postby ebranlund » Tue Apr 11, 2017 2:09 am

On a Debian 8 x86_64 system (Intel W3690 CPU; SMP Debian 3.16.39-1+deb8u2 kernel) using Debian's gfortran 4.9 package (Debian version 4.9.2-10 based on gcc 4.9.2) as the compiler, there appears to be a serious test failure for one of the double precision singular value decomposition tests with 32-bit versions of LAPACK 3.7.0 and Netlib's BLAS 3.7.0. For compiling BLAS, make.inc had FORTRAN and LOADER set to "gfortran -m32" and OPTS set to -O3. For compiling LAPACK, make.inc had FORTRAN and LOADER set to "gfortran -m32" and OPTS set to "-O2 -frecursive". Changing the optimization for BLAS to -O0 and for LAPACK to "-O0 -frecursive" had the same test failure. The failure did not occur when BLAS and LAPACK were compiled as 64-bit binaries. The output in dsvd.out around the point of the failure was

DGESVDX passed the tests of the error exits ( 12 tests done)


SVD: NB = 1, NBMIN = 2, NX = 1, NRHS = 2

DBD -- Real Singular Value Decomposition
<matrix and ratio description snipped>
M= 3, N= 3, type 6, seed=3995,2595,1863,3721, test(32)= 0.1501E+16
DBD: 1 out of 10260 tests failed to pass the threshold
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Re: DBD test failure: 32-bit LAPACK 3.7.0/Netlib BLAS 3.7.0

Postby admin » Wed Apr 12, 2017 12:41 am

I would not be too worried if there is only one failure, and especially since it is working with the 64-bit binaries.
We are aware of some tests failing for particular architectures.
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